题名:La_(15-x)Nd_xFe_(14)Ni_(64)Mn_5B_2(x=0-6)贮氢合金的结构和电化学性能研究
作者:张秀飞
学位授予单位:内蒙古科技大学
关键词:La-Fe-B系贮氢合金;;相结构;;电化学性能;;镍氢电池;;稀土功能材料
摘要:
新型La-Fe-B系贮氢合金是一种“绿色”环保的稀土功能材料,具有较好的贮氢特性和较低的成本,综合电化学性能与传统LaNi_5型合金相当,可以不用价值较高的Co,同时含有价值低廉的Fe元素,成本比商品LaNi_5型贮氢合金低10-40%,可以开发出满足电池不同需求的各种贮氢电极材料。La-Fe-B系贮氢电极材料有着广阔的市场前景和Neodymium magnets显著的经济社会效益预期,具有重大的开发价值。
元素替代法是改善贮氢合金性能的主要途径之一。本文研究了Nd部分替代La15Fe14Ni64Mn5B2合金中的La对材料结构和性能的影响。
采用中频感应熔炼-快淬法制备了La_(15-x)Nd_xFe_(14)Ni_(64)Mn_5B_2(x=0、2、4、6)贮氢合金,在一定的温度和压力下退火处理。X射线衍射(XRD)分析表明,合金由LaNi_5相、(Fe,Ni)相和La_3Ni_(13)B_2相组成。Nd替代La没有改变相组成,但衍射峰略向高角度方向位移。扫描电镜(SEM)及能谱(EDS)分析结果与XRD分析的相组成结果一致。适量的Nd替代La能够改善P-C-T的平台性能。电化学测试表明,La_(15-x)Nd_xFe_(14)Ni_(64)Mn_5B_2 (x=0、2、4、6)贮氢合金的放电容量、高倍率放http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php电能力(HRD)随x值的增大先增加后减小,x=2合金电极的放电容量最大(302 mAh·g~(-1)),HRD也最大(65.6%)。Nd替代La对合金的循环性能有所改善。
退火热处理改善了La_(15-x)Nd_xFe_(14)Ni_(64)Mn_5B_2(x=0、2、4、6)贮氢合金电极的活化性能,提高了放电容量和高倍率放电性能,但电极循环稳定性下降。
学位年度:2010
2011年12月28日星期三
低钕快淬钕铁硼磁粉及其生产管理软件系统的研制
题名:低钕快淬钕铁硼磁粉及其生产管理软件系统的研制
作者:李兆波
学位授予单位:电子科技大学
关键词:快淬磁粉;;NdFeB;;LaFeB;;快淬;;动态晶化
摘要:
本文在快淬NdFeB磁粉的基础上,研究了不同的La、Ce添加量对快淬磁粉的影响,并对国产电弧溢流式快淬、晶化等设备进行了改造,在此基础上重点研究了工艺参数对快淬NdFeB/LaFeB磁粉性能的影响及机制,以及合金成份对快淬NdFeB/LaFeB磁粉性能的影响。通过研究发现:随Nd含量的增加,快淬NdFeB/LaFeB磁粉的Br、Hcj和(BH)max增加,磁粉的晶化温度也提高20℃。添加La、Ce后快淬磁粉的最佳B含量由6.5at%提高到7.5at%,7.5at%时Br和(BH)max最佳。对于NdFeB/LaFeB磁粉,Zr的加入能显著提高NdFeB/LaFeB合金的磁性能,原因是Zr的加入使快淬NdFeB/LaFeB合金晶化时α-Fe和Nd2Fe14B同时析出,避免了α-Fe的先析出和长大,细化了晶粒,增强了晶粒之间的交换耦合作用。在快Neodymium magnets淬NdFeB磁粉中,添加La、Ce后,随着添加量的增多,磁性呈下降趋势,而且,在NdFeB/LaFeB磁粉中,Nd+La的总稀土含量达到10.5~11at%的时候,磁粉性能最高。La、Ce的加入降低了磁粉对晶化温度的敏感性,也降低了磁粉的耐温与耐腐蚀性。单独添加La时,磁粉Br、(BH)max高,Hcj低;单独添加Ce时,磁粉的Br、(BH)amx低,Hcj高,这与La、Ce的原子磁矩和磁晶各向异性常数有关。Nb的掺杂导致快淬NdFeB磁粉的Br和(BH)max的降低,但能显著提升磁粉的耐温性能。通过对辊轮开槽解决了国产溢流快淬过程中速度波动和流量波动对磁粉性能影响的技术难题。对于开槽的钼轮,快淬磁粉的性能可以提升10%,生产效率、单炉产量提升1倍。对于NdFeB/LaFeB磁粉,在快淬转速达到19~19.5m/s的时候,综合磁性能最佳。快淬后的磁粉http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php,经过动态晶化能有效控制磁粉内部晶粒的大小、均匀程度,提高磁性能5%,产量提升1倍。最后研究了计算机软件在快淬磁粉的生产与应用中的作用。
学位年度:2010
作者:李兆波
学位授予单位:电子科技大学
关键词:快淬磁粉;;NdFeB;;LaFeB;;快淬;;动态晶化
摘要:
本文在快淬NdFeB磁粉的基础上,研究了不同的La、Ce添加量对快淬磁粉的影响,并对国产电弧溢流式快淬、晶化等设备进行了改造,在此基础上重点研究了工艺参数对快淬NdFeB/LaFeB磁粉性能的影响及机制,以及合金成份对快淬NdFeB/LaFeB磁粉性能的影响。通过研究发现:随Nd含量的增加,快淬NdFeB/LaFeB磁粉的Br、Hcj和(BH)max增加,磁粉的晶化温度也提高20℃。添加La、Ce后快淬磁粉的最佳B含量由6.5at%提高到7.5at%,7.5at%时Br和(BH)max最佳。对于NdFeB/LaFeB磁粉,Zr的加入能显著提高NdFeB/LaFeB合金的磁性能,原因是Zr的加入使快淬NdFeB/LaFeB合金晶化时α-Fe和Nd2Fe14B同时析出,避免了α-Fe的先析出和长大,细化了晶粒,增强了晶粒之间的交换耦合作用。在快Neodymium magnets淬NdFeB磁粉中,添加La、Ce后,随着添加量的增多,磁性呈下降趋势,而且,在NdFeB/LaFeB磁粉中,Nd+La的总稀土含量达到10.5~11at%的时候,磁粉性能最高。La、Ce的加入降低了磁粉对晶化温度的敏感性,也降低了磁粉的耐温与耐腐蚀性。单独添加La时,磁粉Br、(BH)max高,Hcj低;单独添加Ce时,磁粉的Br、(BH)amx低,Hcj高,这与La、Ce的原子磁矩和磁晶各向异性常数有关。Nb的掺杂导致快淬NdFeB磁粉的Br和(BH)max的降低,但能显著提升磁粉的耐温性能。通过对辊轮开槽解决了国产溢流快淬过程中速度波动和流量波动对磁粉性能影响的技术难题。对于开槽的钼轮,快淬磁粉的性能可以提升10%,生产效率、单炉产量提升1倍。对于NdFeB/LaFeB磁粉,在快淬转速达到19~19.5m/s的时候,综合磁性能最佳。快淬后的磁粉http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php,经过动态晶化能有效控制磁粉内部晶粒的大小、均匀程度,提高磁性能5%,产量提升1倍。最后研究了计算机软件在快淬磁粉的生产与应用中的作用。
学位年度:2010
新型混合励磁开关磁阻电机的基础研究
题名:新型混合励磁开关磁阻电机的基础研究
作者:嵇恒
学位授予单位:哈尔滨工业大学
关键词:开关磁阻电机;;混合励磁;;转矩脉动;;有限元分析;;数学模型
摘要:
由于开关磁阻电机具有结构简单、坚固、起动转矩大等优点,使其成为交流电机驱动系统、直流电机驱动系统及无刷直流电机驱动系统的有力竞争者。本文在传统开关磁阻电机的基础上,将传统开关磁阻电机与高性能的稀土永磁材料相结合,提出一种新型混合励磁开关磁阻电机方案。
论文首先介绍该课题研究的背景和意义,分析开关磁阻电机的优缺点,并探索开关磁阻电机未来的研究方向。介绍在传统开关磁阻Neodymium magnets电机的基础上引入高性能永磁体材料的新型混合励磁开关磁阻电机的几种结构形式。针对新型的电机进行总结,并对各自的优缺点进行比较。
论文针对如何提高开关磁阻电机输出电磁转矩和效率的问题,提出一种新型混合励磁开关磁阻电机的结构。建立该新型混合励磁开关磁阻电机的数学模型,研究二种建立该新型混合励磁开关磁阻电机的非线性数学模型的方法,为电机的仿真计算奠定基础。
基于开关磁阻电机的数学模型,研究新型混合励磁开关磁阻电机的工作原理。利用等效磁网络图解法对电机的永磁磁阻转矩进行理论分析,研究励磁电流、永磁体、电机参数对其大小的影响规律。
应用二维电磁场有限元法对新型混合励磁开关磁阻电机进行设计及优化,包括定转子极弧、定子轭高、转子外径及http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php其永磁体的设计优化,总结出电机设计和优化的规律。同时分析电励磁在混合励磁中的作用。
本文最后将新型混合励磁开关磁阻电机与传统电机进行比较。通过对比分析得出新型混合励磁开关磁阻电机在大电流场合下具有高功率密度、大转矩输出等显著特点,并通过传统样机的测试和仿真对比来验证该方案的可行性。
学位年度:2010
作者:嵇恒
学位授予单位:哈尔滨工业大学
关键词:开关磁阻电机;;混合励磁;;转矩脉动;;有限元分析;;数学模型
摘要:
由于开关磁阻电机具有结构简单、坚固、起动转矩大等优点,使其成为交流电机驱动系统、直流电机驱动系统及无刷直流电机驱动系统的有力竞争者。本文在传统开关磁阻电机的基础上,将传统开关磁阻电机与高性能的稀土永磁材料相结合,提出一种新型混合励磁开关磁阻电机方案。
论文首先介绍该课题研究的背景和意义,分析开关磁阻电机的优缺点,并探索开关磁阻电机未来的研究方向。介绍在传统开关磁阻Neodymium magnets电机的基础上引入高性能永磁体材料的新型混合励磁开关磁阻电机的几种结构形式。针对新型的电机进行总结,并对各自的优缺点进行比较。
论文针对如何提高开关磁阻电机输出电磁转矩和效率的问题,提出一种新型混合励磁开关磁阻电机的结构。建立该新型混合励磁开关磁阻电机的数学模型,研究二种建立该新型混合励磁开关磁阻电机的非线性数学模型的方法,为电机的仿真计算奠定基础。
基于开关磁阻电机的数学模型,研究新型混合励磁开关磁阻电机的工作原理。利用等效磁网络图解法对电机的永磁磁阻转矩进行理论分析,研究励磁电流、永磁体、电机参数对其大小的影响规律。
应用二维电磁场有限元法对新型混合励磁开关磁阻电机进行设计及优化,包括定转子极弧、定子轭高、转子外径及http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php其永磁体的设计优化,总结出电机设计和优化的规律。同时分析电励磁在混合励磁中的作用。
本文最后将新型混合励磁开关磁阻电机与传统电机进行比较。通过对比分析得出新型混合励磁开关磁阻电机在大电流场合下具有高功率密度、大转矩输出等显著特点,并通过传统样机的测试和仿真对比来验证该方案的可行性。
学位年度:2010
永磁无刷直流电机转矩脉动抑制方法研究
题名:永磁无刷直流电机转矩脉动抑制方法研究
作者:王哲
学位授予单位:哈尔滨工业大学
关键词:永磁无刷直流电机;;转矩脉动;;PWM调制方式;;重叠换相法;;换向延迟时间
摘要:
随着电力电子技术和稀土永磁材料的进步与发展,永磁无刷直流电机调速范围宽、转矩输出高、功率密度大的优势越来越显著,因此受到越来越广泛的关注和应用。但永磁无刷直流电机存在的转矩脉动问题限制了其在高精度位置和速度控制场合的应用。其中换相转矩脉动是永磁无刷直流电机产生转矩脉动的主要原因,可占到输出平均转矩的50%左右,其产生原因主要是由于120°的两相导通方式和电机Neodymium magnets电枢电感的存在导致开通相和关断相电流变化速率不一致,产生换相转矩脉动。所以分析及抑制永磁无刷直流电机换相转矩脉动成为国内外永磁无刷直流电机问题研究的焦点,本文针对永磁无刷直流电机换相转矩脉动问题,研究对其抑制的策略。
本文首先分析了永磁无刷直流电机的运行特性和工作原理,建立了永磁无刷直流电机的数学模型和仿真模型,为新的抑制策略提供了理论依据和仿真分析平台;由对永磁无刷直流电机换相转矩脉动产生原因的分析,根据电枢方程推导出了转矩脉动的表达式。由转矩脉动表达式,将电机的运行状态划分为低速区和高速区两种。在低速区,分析了永磁无刷直流电机常用的几种PWM调制方式对于低速转矩脉动的抑制效果,分析发现采用单斩的PWM_ON的调节方式对于换相转矩脉动的抑制效果更为明显;在高速区,分析了重叠换相法抑制换相转矩脉动的原理、对换相转矩脉动的抑制效果及适用转速范围,针对重叠换相延迟时间难以确定的问题,本文提出了改进的控制算法:经过数学推导计算出采用重叠换相法抑制换相转矩脉动所需的时间公式,用泰勒公式将其简化,在计算所得的换相延迟时间中,采用重叠换相法抑制转矩脉动,延迟时间过后自动退出换相过程。本方法解决了http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php重叠换相延迟时间无法确定的问题,并且算法简单,能够方便的嵌入到换向转矩脉动抑制策略中,从而有效抑制了换相过程引起的转矩脉动。为了对提出的理论进行验证采用数字信号处理器DSP和FPGA的永磁无刷直流电机驱动系统设计方案;完成了驱动系统控制器的硬件设计、软件设计。通过抑制前与抑制后的对比实验,验证了该控制方式对抑制换相转矩脉动的有效性。
通过本文的分析与研究,不仅为提高永磁无刷直流电机的运行性能奠定了理论基础,也提出了在转矩脉动抑制中存在的问题和难题,为下一步的研究指出了方向。
学位年度:2010
作者:王哲
学位授予单位:哈尔滨工业大学
关键词:永磁无刷直流电机;;转矩脉动;;PWM调制方式;;重叠换相法;;换向延迟时间
摘要:
随着电力电子技术和稀土永磁材料的进步与发展,永磁无刷直流电机调速范围宽、转矩输出高、功率密度大的优势越来越显著,因此受到越来越广泛的关注和应用。但永磁无刷直流电机存在的转矩脉动问题限制了其在高精度位置和速度控制场合的应用。其中换相转矩脉动是永磁无刷直流电机产生转矩脉动的主要原因,可占到输出平均转矩的50%左右,其产生原因主要是由于120°的两相导通方式和电机Neodymium magnets电枢电感的存在导致开通相和关断相电流变化速率不一致,产生换相转矩脉动。所以分析及抑制永磁无刷直流电机换相转矩脉动成为国内外永磁无刷直流电机问题研究的焦点,本文针对永磁无刷直流电机换相转矩脉动问题,研究对其抑制的策略。
本文首先分析了永磁无刷直流电机的运行特性和工作原理,建立了永磁无刷直流电机的数学模型和仿真模型,为新的抑制策略提供了理论依据和仿真分析平台;由对永磁无刷直流电机换相转矩脉动产生原因的分析,根据电枢方程推导出了转矩脉动的表达式。由转矩脉动表达式,将电机的运行状态划分为低速区和高速区两种。在低速区,分析了永磁无刷直流电机常用的几种PWM调制方式对于低速转矩脉动的抑制效果,分析发现采用单斩的PWM_ON的调节方式对于换相转矩脉动的抑制效果更为明显;在高速区,分析了重叠换相法抑制换相转矩脉动的原理、对换相转矩脉动的抑制效果及适用转速范围,针对重叠换相延迟时间难以确定的问题,本文提出了改进的控制算法:经过数学推导计算出采用重叠换相法抑制换相转矩脉动所需的时间公式,用泰勒公式将其简化,在计算所得的换相延迟时间中,采用重叠换相法抑制转矩脉动,延迟时间过后自动退出换相过程。本方法解决了http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php重叠换相延迟时间无法确定的问题,并且算法简单,能够方便的嵌入到换向转矩脉动抑制策略中,从而有效抑制了换相过程引起的转矩脉动。为了对提出的理论进行验证采用数字信号处理器DSP和FPGA的永磁无刷直流电机驱动系统设计方案;完成了驱动系统控制器的硬件设计、软件设计。通过抑制前与抑制后的对比实验,验证了该控制方式对抑制换相转矩脉动的有效性。
通过本文的分析与研究,不仅为提高永磁无刷直流电机的运行性能奠定了理论基础,也提出了在转矩脉动抑制中存在的问题和难题,为下一步的研究指出了方向。
学位年度:2010
激光直接堆积成形镍基高温合金及其抗高温氧化性能研究
题名:激光直接堆积成形镍基高温合金及其抗高温氧化性能研究
作者:朱力钢
学位授予单位:浙江工业大学
关键词:激光直接堆积成形;;镍基高温合金;;稀土氧化物;;抗高温氧化性能
摘要:
高温合金是现代动力装置的重要材料,在航空、航天、能源动力等领域有着广泛的应用。本文以镍基高温合金K438为基材,在Inconel738合金粉末中添加不同质量分数的稀土氧化物Y_2O_3,采用激光直接堆积成形(DMD)技术获得表面平整、无气孔裂纹等缺陷并具有一定高度的成形件,并研究对比成形件与基体的抗高温氧化性能。
本文分别对添加不同质量分数Y_2O_3和不同激光工艺参数作用下的成形件进行比较分析,采用扫描电子显微镜(SEM)和显微硬度计观察了成形件的宏观及显微组织形貌、硬度分布;采用X射线衍射仪(XRD)对成形件Neodymium magnets物相及成分进行分析;对成形件及基体进行高温氧化试验,运用SEM,XRD,能谱分析(EDS)等,对氧化试样表面、截面形貌,元素分布等进行观察分析,并绘制高温氧化动力曲线,对其氧化机理进行分析讨论。
1.研究表明镍基高温合金激光直接成形中裂纹产生的种类与裂纹产生机理主要与熔覆层中残余应力的存在及孔洞杂质等缺陷有关。宏观裂纹在热应力的作用下在孔洞尖角处开裂并向成形件顶部延伸; B、Si等元素所生成的化合物偏析在晶界形成杂质容易产生微观裂纹。
2.在最佳激光工艺参数2.2KW、1000mm/min作用下,在合金粉末中添加0.2%wt的Y_2O_3获得表面质量良好且具有一定高度的成形件。成形件具有定向生长且细化的枝晶组织,并生成与基体相一致的物相Ni_3(Al,Ti)。
3.随着激光功率增大,成形件组织由柱状树枝晶往胞状晶发展,晶粒尺寸有所增大;随着扫描速度增加,熔池冷却速度迅速加大,晶粒细化,晶界增多,成形件硬度也有所提高。
4.成形件试样经高温氧化后,绘制并分析其氧化动力曲线,发现在氧化初期其呈现直线规律,进入氧化稳态后,氧化规律接近于抛物线规律;与基体具有相一致的氧化规律。
5.对氧化试样表面氧化层XRD分析,两者生成氧化膜主要成分均为Cr_2O_3,以及少量的TiO_2,Al-2O_3,及微量的NiCr_2O_4相。对氧化试样截面SEM观察分析,氧化层分为内外氧化膜三层;其中成形件氧化膜分布较为连续,厚度一致,内层氧化与基体结合良好。基体外层氧化膜剥落较多,内层氧化膜出http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php现空洞,较为疏松;熔覆层抗高温氧化性能略高于基体。
学位年度:2010
作者:朱力钢
学位授予单位:浙江工业大学
关键词:激光直接堆积成形;;镍基高温合金;;稀土氧化物;;抗高温氧化性能
摘要:
高温合金是现代动力装置的重要材料,在航空、航天、能源动力等领域有着广泛的应用。本文以镍基高温合金K438为基材,在Inconel738合金粉末中添加不同质量分数的稀土氧化物Y_2O_3,采用激光直接堆积成形(DMD)技术获得表面平整、无气孔裂纹等缺陷并具有一定高度的成形件,并研究对比成形件与基体的抗高温氧化性能。
本文分别对添加不同质量分数Y_2O_3和不同激光工艺参数作用下的成形件进行比较分析,采用扫描电子显微镜(SEM)和显微硬度计观察了成形件的宏观及显微组织形貌、硬度分布;采用X射线衍射仪(XRD)对成形件Neodymium magnets物相及成分进行分析;对成形件及基体进行高温氧化试验,运用SEM,XRD,能谱分析(EDS)等,对氧化试样表面、截面形貌,元素分布等进行观察分析,并绘制高温氧化动力曲线,对其氧化机理进行分析讨论。
1.研究表明镍基高温合金激光直接成形中裂纹产生的种类与裂纹产生机理主要与熔覆层中残余应力的存在及孔洞杂质等缺陷有关。宏观裂纹在热应力的作用下在孔洞尖角处开裂并向成形件顶部延伸; B、Si等元素所生成的化合物偏析在晶界形成杂质容易产生微观裂纹。
2.在最佳激光工艺参数2.2KW、1000mm/min作用下,在合金粉末中添加0.2%wt的Y_2O_3获得表面质量良好且具有一定高度的成形件。成形件具有定向生长且细化的枝晶组织,并生成与基体相一致的物相Ni_3(Al,Ti)。
3.随着激光功率增大,成形件组织由柱状树枝晶往胞状晶发展,晶粒尺寸有所增大;随着扫描速度增加,熔池冷却速度迅速加大,晶粒细化,晶界增多,成形件硬度也有所提高。
4.成形件试样经高温氧化后,绘制并分析其氧化动力曲线,发现在氧化初期其呈现直线规律,进入氧化稳态后,氧化规律接近于抛物线规律;与基体具有相一致的氧化规律。
5.对氧化试样表面氧化层XRD分析,两者生成氧化膜主要成分均为Cr_2O_3,以及少量的TiO_2,Al-2O_3,及微量的NiCr_2O_4相。对氧化试样截面SEM观察分析,氧化层分为内外氧化膜三层;其中成形件氧化膜分布较为连续,厚度一致,内层氧化与基体结合良好。基体外层氧化膜剥落较多,内层氧化膜出http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php现空洞,较为疏松;熔覆层抗高温氧化性能略高于基体。
学位年度:2010
冷坩埚定向凝固钛铝合金板坯的组织、性能及质量
题名:冷坩埚定向凝固钛铝合金板坯的组织、性能及质量
作者:顾世欣
学位授予单位:哈尔滨工业大学
关键词:定向凝固;;电磁冷坩埚;;钛铝基合金;;稀土元素;;片层组织
摘要:
本文选用Ti-46Al-0.5W-0.5Si-0.3Y、Ti-46Al-0.5W-0.5Si-0.2Gd、Ti-46Al-0.5W-0.5Si-0.5Y和Ti-46Al-0.5W-0.5Si-0.165Gd四种钛铝基合金,在不同的加热功率、抽拉速度等工艺参数条件下,利用电磁冷坩埚定向凝固技术分别制备了宽厚比为3:1的钛铝基合金板坯。对板坯的宏观组织、显微组织和成形质量进行了观察和分析,最后测试了板坯的力学性能。
板坯试样表面存在浇不足、粘连、Neodymium magnets波纹以及凹坑等缺陷。影响表面质量的因素有送拉比、加热功率、抽拉速度、引料位置以及磁感应强度分布等。
观察和分析了不同抽拉速度和加热功率对初始过渡区的长度、晶粒数量以及稳态生长区的柱状晶生长方向以及晶粒数量的影响以及凝固界面形状的变化。结果表明:随抽拉速度的增加,过渡区长度减小,稳态生长区晶粒数量增加;凝固界面由“W”形逐渐变为倒“W”形,随着加热功率增大,过渡区长度减小,稳态区晶粒数量减少,凝固界面先由平缓变得波动较大随后又逐渐变得平缓。
观察和分析了四种钛铝基合金板坯凝固界面区和稳态生长区的显微组织。凝固界面区由定向凝固区、糊状区和最终凝固区三个区域组成。糊状区的晶粒形态由胞状晶逐渐向树枝晶过渡,而最终凝固区内则均为树枝晶。这些树枝晶的一次枝晶多呈四轴对称,少量呈六轴对称,说明合金包晶凝固时多以β相为初生相。
最后利用显微压痕法测试了钛铝基合金板坯的断裂韧性,并测试了板坯在800℃高温下的拉伸性能。发现板坯在不同方向上断裂韧性不同,断裂韧性值最高可达到18.14 MPa·m~(1/2),而在800℃高温下定向凝固板坯的抗http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php
拉强度可达到443MPa,延伸率达到1.66%。分析高温拉伸断口发现定向凝固片层组织的断裂方式主要是沿片层的解理、穿片层断裂和穿晶断裂。含Y的板坯试样塑性较好,韧窝断裂成为主导,断口表现出塑性变形的特征。
学位年度:2010
作者:顾世欣
学位授予单位:哈尔滨工业大学
关键词:定向凝固;;电磁冷坩埚;;钛铝基合金;;稀土元素;;片层组织
摘要:
本文选用Ti-46Al-0.5W-0.5Si-0.3Y、Ti-46Al-0.5W-0.5Si-0.2Gd、Ti-46Al-0.5W-0.5Si-0.5Y和Ti-46Al-0.5W-0.5Si-0.165Gd四种钛铝基合金,在不同的加热功率、抽拉速度等工艺参数条件下,利用电磁冷坩埚定向凝固技术分别制备了宽厚比为3:1的钛铝基合金板坯。对板坯的宏观组织、显微组织和成形质量进行了观察和分析,最后测试了板坯的力学性能。
板坯试样表面存在浇不足、粘连、Neodymium magnets波纹以及凹坑等缺陷。影响表面质量的因素有送拉比、加热功率、抽拉速度、引料位置以及磁感应强度分布等。
观察和分析了不同抽拉速度和加热功率对初始过渡区的长度、晶粒数量以及稳态生长区的柱状晶生长方向以及晶粒数量的影响以及凝固界面形状的变化。结果表明:随抽拉速度的增加,过渡区长度减小,稳态生长区晶粒数量增加;凝固界面由“W”形逐渐变为倒“W”形,随着加热功率增大,过渡区长度减小,稳态区晶粒数量减少,凝固界面先由平缓变得波动较大随后又逐渐变得平缓。
观察和分析了四种钛铝基合金板坯凝固界面区和稳态生长区的显微组织。凝固界面区由定向凝固区、糊状区和最终凝固区三个区域组成。糊状区的晶粒形态由胞状晶逐渐向树枝晶过渡,而最终凝固区内则均为树枝晶。这些树枝晶的一次枝晶多呈四轴对称,少量呈六轴对称,说明合金包晶凝固时多以β相为初生相。
最后利用显微压痕法测试了钛铝基合金板坯的断裂韧性,并测试了板坯在800℃高温下的拉伸性能。发现板坯在不同方向上断裂韧性不同,断裂韧性值最高可达到18.14 MPa·m~(1/2),而在800℃高温下定向凝固板坯的抗http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php
拉强度可达到443MPa,延伸率达到1.66%。分析高温拉伸断口发现定向凝固片层组织的断裂方式主要是沿片层的解理、穿片层断裂和穿晶断裂。含Y的板坯试样塑性较好,韧窝断裂成为主导,断口表现出塑性变形的特征。
学位年度:2010
大情字井地区青山口组二段沉积相研究
题名:大情字井地区青山口组二段沉积相研究
作者:李存磊
学位授予单位:中国海洋大学
关键词:大情字井油田;;青山口组二段;;沉积微相;;沉积模式
摘要:
大情字井油田位于松辽盆地南部中央坳陷区长岭凹陷的中部,是吉林油田具有超亿吨级储量规模的大型岩性油藏群,由于含油层系较多,研究工作量巨大,对目的层段所处沉积相的沉积成因、沉积构造特点以及岩性组合特征的研究水平较低,从而无法对整个工区的沉积规律进行系统而全面的研究,成为制约该地区岩性油气藏勘探开发的瓶颈
本文通过岩心观察和描述,综合运用地震、测井、录井等资料,进行微量元素、泥岩色值、重矿物ZTR指数、古流向以及砂岩成分成熟rare earth magnets度分析,对各层段的区域古沉积环境和物源方向进行了判别,明确了大情字井油田沉积相类型,搞清了沉积微相和储集砂体的时空展布特征,建立了沉积演化模式,以宏观和微观相结合,综合研究砂体微相,确定储层的主控地质因素。
根据泥岩色值、稀土元素、重矿物以及古流向分析,大情字井地区青山口组二段物源主要来自研究区的西部和南部,该时期气候温暖潮湿,湖盆水体规模较大,为水下还原沉积环境。
通过对岩心、钻井和测井资料研究,结合沉积环境和物源分析,首次提出了青二段Ⅳ型三角洲沉积体系,该类型三角洲受风暴浪影响严重,河道和河口沙坝砂体受风浪破坏,不利于河道砂体和指状沙坝砂体等厚砂体的形成。砂体受波浪的改造搬运再沉积,在河口沙坝前方形成与岸线近似平行的滨外沙坝砂体。所钻遇的沉积微相主要有河口沙坝、滨外沙坝、前缘沙席、水下分流河道和分流间。
在单井划相的基础上,进行了常规测井相和成像测井相分析。提取取心井段常规测井特征参数,对与各微相对应得特征参数做数理统计分析,找出规律,采用“专家系统产生式规则表示法”建立微相识别规则,并编程实http://www.chinamagnets.biz/现测井相的自动识别。建立了成像的测井的岩性模式、层理模式和韵律模式,同时利用成像测井图像提取一维伪电阻率曲线辅助建立成像测井单井相层序进行沉积微相解释,克服了成像测井在粉细砂岩地区不易进行观察的缺陷,保留了成像测井高精度的特点,对成像测井资料在细粒岩性沉积微相的分析及平面微相展布分析提供了基础。
在单井相分析的基础上,结合常规测井相分析和成像测井微细分析,确定了不同微相的测井响应特征,结合砂体厚度图和砂体的接触、叠加关系,明确了砂体的展布规律,绘制了研究区青二段砂组和小层的砂体平面分布图、沉积微相平面图,最终建立了研究区的Ⅳ型三角洲沉积模式,确定并描述了砂体的分布特征和时空演化规律。
学位年度:2010
作者:李存磊
学位授予单位:中国海洋大学
关键词:大情字井油田;;青山口组二段;;沉积微相;;沉积模式
摘要:
大情字井油田位于松辽盆地南部中央坳陷区长岭凹陷的中部,是吉林油田具有超亿吨级储量规模的大型岩性油藏群,由于含油层系较多,研究工作量巨大,对目的层段所处沉积相的沉积成因、沉积构造特点以及岩性组合特征的研究水平较低,从而无法对整个工区的沉积规律进行系统而全面的研究,成为制约该地区岩性油气藏勘探开发的瓶颈
本文通过岩心观察和描述,综合运用地震、测井、录井等资料,进行微量元素、泥岩色值、重矿物ZTR指数、古流向以及砂岩成分成熟rare earth magnets度分析,对各层段的区域古沉积环境和物源方向进行了判别,明确了大情字井油田沉积相类型,搞清了沉积微相和储集砂体的时空展布特征,建立了沉积演化模式,以宏观和微观相结合,综合研究砂体微相,确定储层的主控地质因素。
根据泥岩色值、稀土元素、重矿物以及古流向分析,大情字井地区青山口组二段物源主要来自研究区的西部和南部,该时期气候温暖潮湿,湖盆水体规模较大,为水下还原沉积环境。
通过对岩心、钻井和测井资料研究,结合沉积环境和物源分析,首次提出了青二段Ⅳ型三角洲沉积体系,该类型三角洲受风暴浪影响严重,河道和河口沙坝砂体受风浪破坏,不利于河道砂体和指状沙坝砂体等厚砂体的形成。砂体受波浪的改造搬运再沉积,在河口沙坝前方形成与岸线近似平行的滨外沙坝砂体。所钻遇的沉积微相主要有河口沙坝、滨外沙坝、前缘沙席、水下分流河道和分流间。
在单井划相的基础上,进行了常规测井相和成像测井相分析。提取取心井段常规测井特征参数,对与各微相对应得特征参数做数理统计分析,找出规律,采用“专家系统产生式规则表示法”建立微相识别规则,并编程实http://www.chinamagnets.biz/现测井相的自动识别。建立了成像的测井的岩性模式、层理模式和韵律模式,同时利用成像测井图像提取一维伪电阻率曲线辅助建立成像测井单井相层序进行沉积微相解释,克服了成像测井在粉细砂岩地区不易进行观察的缺陷,保留了成像测井高精度的特点,对成像测井资料在细粒岩性沉积微相的分析及平面微相展布分析提供了基础。
在单井相分析的基础上,结合常规测井相分析和成像测井微细分析,确定了不同微相的测井响应特征,结合砂体厚度图和砂体的接触、叠加关系,明确了砂体的展布规律,绘制了研究区青二段砂组和小层的砂体平面分布图、沉积微相平面图,最终建立了研究区的Ⅳ型三角洲沉积模式,确定并描述了砂体的分布特征和时空演化规律。
学位年度:2010
2-氨基-5-甲基吡啶类希夫碱配合物的合成、表征及生物活性研究
题名:2-氨基-5-甲基吡啶类希夫碱配合物的合成、表征及生物活性研究
作者:刘信玉
学位授予单位:中国海洋大学
关键词:2一氨基-5-甲基吡啶;;希夫碱配合物;;合成与表征;;荧光特性;;抑菌活性
摘要:
希夫碱配合物以其多样的结构和广泛的用途越来越受到人们的重视,该类配合物在催化、生物活性及功能材料等领域都有广泛的应用前景。合成新的希夫碱配体和配合物,研究其性质和应用,对配位化学的发展有重要意义。
本文合成了未见报道的2个系列12种新型希夫碱配合物,并得到了三个希夫碱配体的单晶。这些配合物以过渡金属(Ⅱ)和稀土金属(Ⅲ)为rare earth magnets中心离子,以2-氨基-5-甲基吡啶缩邻香草醛、2-氨基-5-甲基吡啶缩2-羟基-1-萘醛为配体合成的。采用元素分析、X-射线单晶衍射、红外光谱、紫外光谱、核磁共振、热分析和摩尔电导率等分析方法对合成的配体及配合物进行了表征,确定了配体的结构,推测了配合物可能的结构,对配体和部分配合物进行了荧光光谱分析,同时对配体和部分配合物的抑菌活性进行了研究。
(1)合成了2-氨基-5-甲基吡啶缩邻香草醛希夫碱配体及其相对应的7种金属配合物,得到了配体的单晶。配体分子式为C]4H14N2O2,式量242.27，属单斜晶系,空间点群P21/C,晶胞参数为：a=11.5995(6)A,α=90.000(5)°,b：4.9546(2)A,β=117.609(4)°,c=23.9983(12)A,γ=90.000(5)。,V=1222.15(10)A3,Z=4,F(000)=512,Dc=1.317 Mg/m3,μ=0.090 mm-1。最终偏差因子[对I>2σ(I)的衍射点]R1=0.0609,wR2=0.1728和R1=0.0911,wR2=0.1985。化合物通过分子间氢键形成二聚体,使整个分子更稳定。7种金属配合物的组成分别为：[LnL1(NO3)(H2O)]NO3·H2O(Ln=La,Pr,Sm);[NiL1(CH3COO)(CH3OH)]·H2O；[CoL1(CH3OH)]CH3COO·H2O；[CuL1(CH3COO)(CH3OH)]；[ZnL1(CH3COO) (CH3OH)]；所合成的配合物均为有色、粉末状固体,在空气中能稳定存在。配体中C=N上的N原子、吡啶环上的N原子,酚羟基上的O原子均参与了配位,配合物中醋酸根、硝酸根以双齿形式参与配位,水参与配位或以结晶形式存在。
(2)合成了2-氨基-5-甲基吡啶缩2-羟基-1-萘醛希夫碱配体及其相对应的5种金属配合物,得到了配体的单晶。配体分子式为C17H14N2O,式量261.29,属单斜晶系,空间点群P21/C,晶胞参数为a=4.8703(2)A,α=90.000(5)°,b=9.5525(5)A,β=98.353(2)°,c=14.0804(6))A,γ=90.000(5)°,V=648.12(5)A3,Z=2,F000)=274,Dc=1.339 Mg/m3,μ=0.085 mm-1.最终偏差因子[对I>2σ(I)的衍射点]R1=0.0419,wR2=0.1094和R1=0.0562,wR2=0.1196。化合物通过分子间氢键形成“Z”字型一维链结构,使整个分子更稳定。配合物的组成分别为：[COL2(CH3COO)(H2O)];[ZnL2(CH3COO)(H2O)]；[CuL2(CH3COO)(H2O)]·H2O；[NiL2(CH3COO)(H2O)]·H2O；[CdL2(CH3COO)(H2O)]·H2O.所合成的配合物均为有色、粉末状固体,在空气中能稳定存在。配体中C=N上的N原子、吡啶环上的N原子,酚羟基上的O原子均参与了配位,配合物中醋酸根以双齿形式参与配位,水参与配位或以结晶http://www.chinamagnets.biz/形式存在。
(3)合成了4-氨基安替比林缩对苯二甲醛双希夫碱(L),并得到其单晶。该化合物属单斜晶系,空间点群P21/C,分子式为C3OH28N6O2,M=504.58.晶胞参数为a=6.1375(1)A,α=90.000(5)°,b=24.6571(4)A,β=94.781(1)°,c=17.7487(3)A,γ=90.000(5)°,V=2676.62(8)A3,Z=4,F(000)=1064,Dc=1.252 Mg/m3,μ=0.081 mm-1.最终偏差因子[对,I>2σ(I)的衍射点]R1=0.0463,wR2=0.1153和R1=0.0788,wR2=0.1323。运用ADF量子化学程序包,采用阿姆斯特丹密度泛函理论,在GGA:BLYP/DZ基组水平上对分子进行能量、结构优化及频率的计算,并在优化构型基础上探讨了分子轨道能级、电荷布居分析,用前沿轨道理论(HOMO、LUMO轨道)揭示了化合物的微观结构化学活性部位。
(4)对配体及其部分配合物的荧光特性进行了研究,配体HL1和HL2及配合物[LaL1(NO3)(H2O)]NO3·H2O、[CuL2(CH3COO)(H2O)]·H2O都具有良好的荧光特性,其荧光光谱的激发峰和发射峰λex/λem分别为：291nm/379 nm.291nm/390 nm:329 nm/390 nm.261 nm/368 nm；301nm/368 nm.281 nm/400 nm；338 nm/400 nm:389 nm/400 nm.与配体相比,相应的配合物激发峰和发射峰个数及位置均发生了变化,荧光强度也增强。
(5)利用Achar的微分法和Coats-Redfern的积分法计算程序,分别对30种热分解动力学方程进行了拟合,对部分配合物某步进行了非等温热分解动力学处理,得到了配合物的热分解反应机理、热分解动力学方程、相应的动力学参数及活化熵△S≠和活化吉布斯函数△G≠。结果如下：
配合物[Ni.L1(CH3C00)(CH30H)].H20第3步热分解反应的机理为一级反应方程,其反应动力学函数为：f(α)=1/2(1-α)[-ln(1-α)]-1,热分解速率的动力学方程为：dα/dt=Aexp(-E/RT)f(α)=Aexp(-E/RT)1/2(1-α)[-ln(1-α)]-1,E=554.89 kJ·mol-1, lnA=117.52,r=0.9950,△S≠=727.3 J·mol-1·K-1,△G≠=167.2 kJ·mol-1。
配合物[CuL2(CH3COO)(H2O)]·H2O第3步热分解反应的机理为一级反应,其反应动力学函数为：f(α)=1/2(1-α)[-ln(1-α)]-1,热分解速率的动力学方程为：dα/dt=A exp(-E/RT)f(α)=A exp(-E/RT) 1/2(1-α)[-ln(1-α)]-1,E=507.85 kJ·mol-1 lnA=102.26,r=0.9196,△S≠=600.6 J·mol-1·K-1,△G≠=191.9 kJ·mol-1。
(6)采用牛津杯抑菌圈法对希夫碱配体及其部分金属配合物对大肠杆菌和金黄色葡萄球菌的抑菌活性进行了初步研究。研究结果表明所供测试的化合物的抑菌活性均与浓度正相关,其中配体HL’和配合物[CoL1(CH3OH)]CH3COO·H2O具有广谱抑菌活性,配合物的抑菌活性明显高于相应的配体,说明配合物中的金属离子对细菌的生长发挥了重要的抑制作用。
学位年度:2010
作者:刘信玉
学位授予单位:中国海洋大学
关键词:2一氨基-5-甲基吡啶;;希夫碱配合物;;合成与表征;;荧光特性;;抑菌活性
摘要:
希夫碱配合物以其多样的结构和广泛的用途越来越受到人们的重视,该类配合物在催化、生物活性及功能材料等领域都有广泛的应用前景。合成新的希夫碱配体和配合物,研究其性质和应用,对配位化学的发展有重要意义。
本文合成了未见报道的2个系列12种新型希夫碱配合物,并得到了三个希夫碱配体的单晶。这些配合物以过渡金属(Ⅱ)和稀土金属(Ⅲ)为rare earth magnets中心离子,以2-氨基-5-甲基吡啶缩邻香草醛、2-氨基-5-甲基吡啶缩2-羟基-1-萘醛为配体合成的。采用元素分析、X-射线单晶衍射、红外光谱、紫外光谱、核磁共振、热分析和摩尔电导率等分析方法对合成的配体及配合物进行了表征,确定了配体的结构,推测了配合物可能的结构,对配体和部分配合物进行了荧光光谱分析,同时对配体和部分配合物的抑菌活性进行了研究。
(1)合成了2-氨基-5-甲基吡啶缩邻香草醛希夫碱配体及其相对应的7种金属配合物,得到了配体的单晶。配体分子式为C]4H14N2O2,式量242.27，属单斜晶系,空间点群P21/C,晶胞参数为：a=11.5995(6)A,α=90.000(5)°,b：4.9546(2)A,β=117.609(4)°,c=23.9983(12)A,γ=90.000(5)。,V=1222.15(10)A3,Z=4,F(000)=512,Dc=1.317 Mg/m3,μ=0.090 mm-1。最终偏差因子[对I>2σ(I)的衍射点]R1=0.0609,wR2=0.1728和R1=0.0911,wR2=0.1985。化合物通过分子间氢键形成二聚体,使整个分子更稳定。7种金属配合物的组成分别为：[LnL1(NO3)(H2O)]NO3·H2O(Ln=La,Pr,Sm);[NiL1(CH3COO)(CH3OH)]·H2O；[CoL1(CH3OH)]CH3COO·H2O；[CuL1(CH3COO)(CH3OH)]；[ZnL1(CH3COO) (CH3OH)]；所合成的配合物均为有色、粉末状固体,在空气中能稳定存在。配体中C=N上的N原子、吡啶环上的N原子,酚羟基上的O原子均参与了配位,配合物中醋酸根、硝酸根以双齿形式参与配位,水参与配位或以结晶形式存在。
(2)合成了2-氨基-5-甲基吡啶缩2-羟基-1-萘醛希夫碱配体及其相对应的5种金属配合物,得到了配体的单晶。配体分子式为C17H14N2O,式量261.29,属单斜晶系,空间点群P21/C,晶胞参数为a=4.8703(2)A,α=90.000(5)°,b=9.5525(5)A,β=98.353(2)°,c=14.0804(6))A,γ=90.000(5)°,V=648.12(5)A3,Z=2,F000)=274,Dc=1.339 Mg/m3,μ=0.085 mm-1.最终偏差因子[对I>2σ(I)的衍射点]R1=0.0419,wR2=0.1094和R1=0.0562,wR2=0.1196。化合物通过分子间氢键形成“Z”字型一维链结构,使整个分子更稳定。配合物的组成分别为：[COL2(CH3COO)(H2O)];[ZnL2(CH3COO)(H2O)]；[CuL2(CH3COO)(H2O)]·H2O；[NiL2(CH3COO)(H2O)]·H2O；[CdL2(CH3COO)(H2O)]·H2O.所合成的配合物均为有色、粉末状固体,在空气中能稳定存在。配体中C=N上的N原子、吡啶环上的N原子,酚羟基上的O原子均参与了配位,配合物中醋酸根以双齿形式参与配位,水参与配位或以结晶http://www.chinamagnets.biz/形式存在。
(3)合成了4-氨基安替比林缩对苯二甲醛双希夫碱(L),并得到其单晶。该化合物属单斜晶系,空间点群P21/C,分子式为C3OH28N6O2,M=504.58.晶胞参数为a=6.1375(1)A,α=90.000(5)°,b=24.6571(4)A,β=94.781(1)°,c=17.7487(3)A,γ=90.000(5)°,V=2676.62(8)A3,Z=4,F(000)=1064,Dc=1.252 Mg/m3,μ=0.081 mm-1.最终偏差因子[对,I>2σ(I)的衍射点]R1=0.0463,wR2=0.1153和R1=0.0788,wR2=0.1323。运用ADF量子化学程序包,采用阿姆斯特丹密度泛函理论,在GGA:BLYP/DZ基组水平上对分子进行能量、结构优化及频率的计算,并在优化构型基础上探讨了分子轨道能级、电荷布居分析,用前沿轨道理论(HOMO、LUMO轨道)揭示了化合物的微观结构化学活性部位。
(4)对配体及其部分配合物的荧光特性进行了研究,配体HL1和HL2及配合物[LaL1(NO3)(H2O)]NO3·H2O、[CuL2(CH3COO)(H2O)]·H2O都具有良好的荧光特性,其荧光光谱的激发峰和发射峰λex/λem分别为：291nm/379 nm.291nm/390 nm:329 nm/390 nm.261 nm/368 nm；301nm/368 nm.281 nm/400 nm；338 nm/400 nm:389 nm/400 nm.与配体相比,相应的配合物激发峰和发射峰个数及位置均发生了变化,荧光强度也增强。
(5)利用Achar的微分法和Coats-Redfern的积分法计算程序,分别对30种热分解动力学方程进行了拟合,对部分配合物某步进行了非等温热分解动力学处理,得到了配合物的热分解反应机理、热分解动力学方程、相应的动力学参数及活化熵△S≠和活化吉布斯函数△G≠。结果如下：
配合物[Ni.L1(CH3C00)(CH30H)].H20第3步热分解反应的机理为一级反应方程,其反应动力学函数为：f(α)=1/2(1-α)[-ln(1-α)]-1,热分解速率的动力学方程为：dα/dt=Aexp(-E/RT)f(α)=Aexp(-E/RT)1/2(1-α)[-ln(1-α)]-1,E=554.89 kJ·mol-1, lnA=117.52,r=0.9950,△S≠=727.3 J·mol-1·K-1,△G≠=167.2 kJ·mol-1。
配合物[CuL2(CH3COO)(H2O)]·H2O第3步热分解反应的机理为一级反应,其反应动力学函数为：f(α)=1/2(1-α)[-ln(1-α)]-1,热分解速率的动力学方程为：dα/dt=A exp(-E/RT)f(α)=A exp(-E/RT) 1/2(1-α)[-ln(1-α)]-1,E=507.85 kJ·mol-1 lnA=102.26,r=0.9196,△S≠=600.6 J·mol-1·K-1,△G≠=191.9 kJ·mol-1。
(6)采用牛津杯抑菌圈法对希夫碱配体及其部分金属配合物对大肠杆菌和金黄色葡萄球菌的抑菌活性进行了初步研究。研究结果表明所供测试的化合物的抑菌活性均与浓度正相关,其中配体HL’和配合物[CoL1(CH3OH)]CH3COO·H2O具有广谱抑菌活性,配合物的抑菌活性明显高于相应的配体,说明配合物中的金属离子对细菌的生长发挥了重要的抑制作用。
学位年度:2010
Yb：Ho：PbWO_4晶体上转换发光性能研究
题名:Yb：Ho：PbWO_4晶体上转换发光性能研究
作者:王冲
学位授予单位:哈尔滨工业大学
关键词:钨酸铅晶体;;掺杂;;晶体结构;;上转换发光;;能级
摘要:
由于钨酸铅(PbWO4, PWO)晶体的光产额低,限制了它在许多领域的应用。为了改善其光学性质,稀土掺杂技术被广泛的研究和应用。本文研究了提拉法生长掺杂PWO晶体的工艺,并生长出质量优良的掺杂晶体,研究了掺杂PWO晶体的结构和光学性能。
运用XRD测试技术,研究了Ho:PWO和Yb:Ho:PWO晶体的结构。掺杂后PWO晶体仍保持很好的四方结构,与纯PWO晶体相比,晶胞参数略rare earth magnets有变化。晶体的拉曼光谱表明,掺杂PWO晶体与纯PWO晶体相比,晶体中(WO4)~(2-)基团的特征峰没有发生明显的位移,掺杂离子没有明显影响(WO4)~(2-)基团的结构。
晶体的紫外吸收光谱表明,掺杂后晶体吸收强度增大,并出现了Ho~(3+)特征吸收峰,Ho~(3+)和Yb~(3+)优先占据Pb~(2+)格位,吸收边先蓝移后红移。
通过波长为980nm激光器激发的上转换发射谱分析,发现单掺Ho~(3+)的钨酸铅晶体没有出现上转换发光,Ho~(3+)和Yb~(3+)双掺钨酸铅晶体实现了540nm、650nm和756nm附近的上转换发光。由Ho~(3+)和Yb~(3+)的能级图可以看出:Yb~(3+)的能级结构非常简单,540nm、650nm和756nm处的发光分别对应于Ho~(3+)的~5F_4,~5S_2→~5I_8、~5F_5→~5I_8以及~5F_4,~5S_2→~5I_7辐射跃迁。当[Yb]/[Ho]值为20时,上转换绿光强度最大,[Yb]/[Ho]值为4时,红光上转换发光强度最大。
测试荧光强度和泵浦功http://www.chinamagnets.biz/率的关系,Yb~(3+)(0.2mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(0.4mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(1.0mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(2.0mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(3.0mol%):Ho~(3+)(0.1mol%):PWO晶体的绿光功率曲线斜率分别为1.936、2.110、2.339、1.693、1.186,红光功率曲线斜率分别是1.627、1.703、1.746、1.620、1.302。说明红光和绿光发射既有单光子过程,又有双光子过程。且在Yb~(3+)高浓度掺杂时,晶体的功率曲线斜率相对较小,此时上转换荧光发生合作敏化过程。
学位年度:2010
作者:王冲
学位授予单位:哈尔滨工业大学
关键词:钨酸铅晶体;;掺杂;;晶体结构;;上转换发光;;能级
摘要:
由于钨酸铅(PbWO4, PWO)晶体的光产额低,限制了它在许多领域的应用。为了改善其光学性质,稀土掺杂技术被广泛的研究和应用。本文研究了提拉法生长掺杂PWO晶体的工艺,并生长出质量优良的掺杂晶体,研究了掺杂PWO晶体的结构和光学性能。
运用XRD测试技术,研究了Ho:PWO和Yb:Ho:PWO晶体的结构。掺杂后PWO晶体仍保持很好的四方结构,与纯PWO晶体相比,晶胞参数略rare earth magnets有变化。晶体的拉曼光谱表明,掺杂PWO晶体与纯PWO晶体相比,晶体中(WO4)~(2-)基团的特征峰没有发生明显的位移,掺杂离子没有明显影响(WO4)~(2-)基团的结构。
晶体的紫外吸收光谱表明,掺杂后晶体吸收强度增大,并出现了Ho~(3+)特征吸收峰,Ho~(3+)和Yb~(3+)优先占据Pb~(2+)格位,吸收边先蓝移后红移。
通过波长为980nm激光器激发的上转换发射谱分析,发现单掺Ho~(3+)的钨酸铅晶体没有出现上转换发光,Ho~(3+)和Yb~(3+)双掺钨酸铅晶体实现了540nm、650nm和756nm附近的上转换发光。由Ho~(3+)和Yb~(3+)的能级图可以看出:Yb~(3+)的能级结构非常简单,540nm、650nm和756nm处的发光分别对应于Ho~(3+)的~5F_4,~5S_2→~5I_8、~5F_5→~5I_8以及~5F_4,~5S_2→~5I_7辐射跃迁。当[Yb]/[Ho]值为20时,上转换绿光强度最大,[Yb]/[Ho]值为4时,红光上转换发光强度最大。
测试荧光强度和泵浦功http://www.chinamagnets.biz/率的关系,Yb~(3+)(0.2mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(0.4mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(1.0mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(2.0mol%):Ho~(3+)(0.1mol%):PWO、Yb~(3+)(3.0mol%):Ho~(3+)(0.1mol%):PWO晶体的绿光功率曲线斜率分别为1.936、2.110、2.339、1.693、1.186,红光功率曲线斜率分别是1.627、1.703、1.746、1.620、1.302。说明红光和绿光发射既有单光子过程,又有双光子过程。且在Yb~(3+)高浓度掺杂时,晶体的功率曲线斜率相对较小,此时上转换荧光发生合作敏化过程。
学位年度:2010
双羧基配位超分子中的配位及非键作用
题名:双羧基配位超分子中的配位及非键作用
作者:刘雪佳
学位授予单位:天津大学
关键词:超分子聚合物;;网络结构;;氢键;;π-π堆积
摘要:
超分子配位聚合物是以金属离子为中心,以有机配体为桥联构件,利用配位键、非键作用如氢键、π-π堆积作用、范德华力以及疏水作用等所形成的以分子为结构基元的集合体。分子识别和分子自组装是超分子化学的基本特征。同rare earth magnets时,分子间弱相互作用对超分子结构的影响是超分子化学的重要研究内容之一。超分子化合物的设计合成对开发新型高性能材料具有重要的指导意义。
双齿甜菜碱衍生物1,5?二(3?羧基吡啶基)?N?甲基二乙胺(L1)和1,5?二(4?羧基吡啶基)?N?甲基二乙胺(L2)具有以下显著的优点:(1)分子具有两个裸露的羧基,不仅易于与金属离子形成配位键,而且是良好的氢键受体;(2)分子具有两个芳香环,其π-π堆积作用将对所形成的超分子的拓扑结构产生显著影响;(3)连接两个吡啶环的N?甲基二乙胺基链具有很大的柔性,可以在一定范围内发生自由旋转,从而产生构型多变的配位超分子结构;(4)羧基及氮正离子的存在,使配体分子中吡啶环上氢原子的酸性显著增强,从而使其成为较好的氢键给体;
本论文进一步研究了L1和L2分别与锌盐、锰盐、银盐、镉盐、铅盐以及稀土金属盐的作用,合成了九个配位聚合物({[ZnL1(SCN)_2 ]·H_2O}_n(1)、{H_3L1(ClO_4)_2(PF6)}_n(2)、{[CdL1Cl_2]·H_2O}_n(3)、{[Pb8L1_(10)(ClO_4)_(16)]·14H_2O}_n(4)、{[La2L1_4(ClO_4)_6]·8H_2O}_n(5)、{[MnL2Cl_2]·2H_2O}_n(6)、{ZnL2(SCN)_2}_n(7)、{[Ag_4L2_2(CF_3SO_3)_4]·11H_2O}_n(8)、{[CdL_2(OAc)_2]·H_2O}_n(9)),并用单晶X-射线衍射方法进行了结构分析。
结构分析表明:(1)在所形成的超分子聚合物中,羧基呈现出丰富的配位模式。如在聚合物4中的20个羧基分别以单齿桥联、顺-反双齿桥联、反-反双齿桥联、双齿螯合、螯合加单原子桥联、双齿加单原子桥联六种配http://www.chinamagnets.biz/位模式与Pb(II)配位;(2)不同的金属离子具有不同的配位构型,同一种金属也可能具有不同的配位构型;(3)阴离子不但能够维持聚合物电荷平衡,还可以通过配位作用、桥联作用以及填充识别作用影响超分子聚合物的拓扑结构;(4)配体的同分异构现象对超分子聚合物网络结构产生重要的影响;(5)超分子聚合物形成的驱动力往往不是单一的,多数情况下是以一种作用力为主,几种作用力协同作用的结果。配位聚合物二维或三维拓扑结构的构筑主要归功于氢键和π-π堆积作用。
学位年度:2010
作者:刘雪佳
学位授予单位:天津大学
关键词:超分子聚合物;;网络结构;;氢键;;π-π堆积
摘要:
超分子配位聚合物是以金属离子为中心,以有机配体为桥联构件,利用配位键、非键作用如氢键、π-π堆积作用、范德华力以及疏水作用等所形成的以分子为结构基元的集合体。分子识别和分子自组装是超分子化学的基本特征。同rare earth magnets时,分子间弱相互作用对超分子结构的影响是超分子化学的重要研究内容之一。超分子化合物的设计合成对开发新型高性能材料具有重要的指导意义。
双齿甜菜碱衍生物1,5?二(3?羧基吡啶基)?N?甲基二乙胺(L1)和1,5?二(4?羧基吡啶基)?N?甲基二乙胺(L2)具有以下显著的优点:(1)分子具有两个裸露的羧基,不仅易于与金属离子形成配位键,而且是良好的氢键受体;(2)分子具有两个芳香环,其π-π堆积作用将对所形成的超分子的拓扑结构产生显著影响;(3)连接两个吡啶环的N?甲基二乙胺基链具有很大的柔性,可以在一定范围内发生自由旋转,从而产生构型多变的配位超分子结构;(4)羧基及氮正离子的存在,使配体分子中吡啶环上氢原子的酸性显著增强,从而使其成为较好的氢键给体;
本论文进一步研究了L1和L2分别与锌盐、锰盐、银盐、镉盐、铅盐以及稀土金属盐的作用,合成了九个配位聚合物({[ZnL1(SCN)_2 ]·H_2O}_n(1)、{H_3L1(ClO_4)_2(PF6)}_n(2)、{[CdL1Cl_2]·H_2O}_n(3)、{[Pb8L1_(10)(ClO_4)_(16)]·14H_2O}_n(4)、{[La2L1_4(ClO_4)_6]·8H_2O}_n(5)、{[MnL2Cl_2]·2H_2O}_n(6)、{ZnL2(SCN)_2}_n(7)、{[Ag_4L2_2(CF_3SO_3)_4]·11H_2O}_n(8)、{[CdL_2(OAc)_2]·H_2O}_n(9)),并用单晶X-射线衍射方法进行了结构分析。
结构分析表明:(1)在所形成的超分子聚合物中,羧基呈现出丰富的配位模式。如在聚合物4中的20个羧基分别以单齿桥联、顺-反双齿桥联、反-反双齿桥联、双齿螯合、螯合加单原子桥联、双齿加单原子桥联六种配http://www.chinamagnets.biz/位模式与Pb(II)配位;(2)不同的金属离子具有不同的配位构型,同一种金属也可能具有不同的配位构型;(3)阴离子不但能够维持聚合物电荷平衡,还可以通过配位作用、桥联作用以及填充识别作用影响超分子聚合物的拓扑结构;(4)配体的同分异构现象对超分子聚合物网络结构产生重要的影响;(5)超分子聚合物形成的驱动力往往不是单一的,多数情况下是以一种作用力为主,几种作用力协同作用的结果。配位聚合物二维或三维拓扑结构的构筑主要归功于氢键和π-π堆积作用。
学位年度:2010
12SrO·7Al_2O_3负载La_（0.8）Sr_（0.2）MnO_3和CuMn_2Ce_4催化燃烧性能研究
题名:12SrO·7Al_2O_3负载La_（0.8）Sr_（0.2）MnO_3和CuMn_2Ce_4催化燃烧性能研究
作者:王占龙
学位授予单位:浙江工业大学
关键词:12SrO·7Al_2O_3;;La_(0.8)Sr_(0.2)MnO_3;;CuMn_2Ce_4;;涂层;;催化燃烧
摘要:
催化燃烧是一种有效的消除挥发性有机物废气的技术。过渡金属氧化物La_(0.8)Sr_(0.2)MnO_3和CuMn_2Ce_4因其价格低廉,催化活性较高,热稳定性较好,有望取代贵金属成为VOCs燃烧应用的主要工业催化剂。由于压降和rare earth magnets传质效率等因素,VOCs燃烧中使用的多是整体式催化剂。涂层是影响整体式过渡金属氧化物催化剂热稳定性的重要因素之一,掺入稀土或碱土金属的改性γ-Al_2O_3是性能较好的一类涂层材料。
本文采用固相反应法制备了钙铝石型12SrO·7Al_2O_3材料,以其作为整体蜂窝陶瓷催化剂的涂层,考察了催化剂的燃烧性能,得到以下结果:
与以γ-Al_2O_3和六铝酸盐Sr_(0.3)Ba_(0.5)La_(0.2)MnAl_(11_O_(19)作为涂层的钙钛矿整体催化剂比较可发现, 12SrO·7Al_2O_3作为涂层时明显改善了钙钛矿整体催化剂的活性和热稳定性,在850℃下焙烧6 h之后,以12SrO·7Al_2O_3作为涂层的整体催化剂仍可以在260℃左右就可以将甲基丙烯酸甲酯完全转化,而γ-Al_2O_3和Sr_(0.3)Ba_(0.5)La_(0.2)MnAl_(11_O_(19)为涂层的催化剂分别需要320和340℃。BET和SEM的结果表明,比表面积不是12SrO·7Al_2O_3起作用的主要因素,而避免了La_(0.8)Sr_(0.2)MnO_3颗粒在其表面的烧结,从而维持了高温下La_(0.8)Sr_(0.2)MnO_3活性组分的分散性,才是12SrO·7Al_2O_3作为蜂窝陶瓷型钙钛矿整体催化剂涂层优于γ-Al_2O_3和Sr_(0.3)Ba_(0.5)La_(0.2)MnAl_(11_O_(19)的主要原因。
其次,以堇青石为基体,12SrO·7Al_2O_3材料为涂层,采用溶液浸渍法制备了蜂窝陶瓷型CuMn_2Ce_4整体催化剂,考察了该整体催化剂的性能。结果表明,以12SrO·7Al_2O_3作为涂层的整体催化剂与无涂层的CuMn_2Ce_4整体催化剂相比,其耐高温性能有了明显提高,SEM、EDS和BET表明有涂层的整体催化剂活http://www.chinamagnets.biz/性组分较之无涂层整体催化剂更为稳定,在表面原子总数中所占比重更高。12SrO·7Al_2O_3涂层材料的存在不仅避免了CuMn_2Ce_4与堇青石发生的固相反应,保持了CuMn_2Ce_4活性组分结构和比表面积,也使得其更多的保持在催化剂的表面,从而改进了CuMn_2Ce_4整体催化剂耐高温性能。
最后,为进一步提高La_(0.8)Sr_(0.2)MnO_3活性组分的催化活性,进行了向La_(0.8)Sr_(0.2)MnO_3中掺杂贵金属钯的初步研究。结果发现当钯的掺杂量为0.8%-1.2%时活性提高最为明显。
学位年度:2010
作者:王占龙
学位授予单位:浙江工业大学
关键词:12SrO·7Al_2O_3;;La_(0.8)Sr_(0.2)MnO_3;;CuMn_2Ce_4;;涂层;;催化燃烧
摘要:
催化燃烧是一种有效的消除挥发性有机物废气的技术。过渡金属氧化物La_(0.8)Sr_(0.2)MnO_3和CuMn_2Ce_4因其价格低廉,催化活性较高,热稳定性较好,有望取代贵金属成为VOCs燃烧应用的主要工业催化剂。由于压降和rare earth magnets传质效率等因素,VOCs燃烧中使用的多是整体式催化剂。涂层是影响整体式过渡金属氧化物催化剂热稳定性的重要因素之一,掺入稀土或碱土金属的改性γ-Al_2O_3是性能较好的一类涂层材料。
本文采用固相反应法制备了钙铝石型12SrO·7Al_2O_3材料,以其作为整体蜂窝陶瓷催化剂的涂层,考察了催化剂的燃烧性能,得到以下结果:
与以γ-Al_2O_3和六铝酸盐Sr_(0.3)Ba_(0.5)La_(0.2)MnAl_(11_O_(19)作为涂层的钙钛矿整体催化剂比较可发现, 12SrO·7Al_2O_3作为涂层时明显改善了钙钛矿整体催化剂的活性和热稳定性,在850℃下焙烧6 h之后,以12SrO·7Al_2O_3作为涂层的整体催化剂仍可以在260℃左右就可以将甲基丙烯酸甲酯完全转化,而γ-Al_2O_3和Sr_(0.3)Ba_(0.5)La_(0.2)MnAl_(11_O_(19)为涂层的催化剂分别需要320和340℃。BET和SEM的结果表明,比表面积不是12SrO·7Al_2O_3起作用的主要因素,而避免了La_(0.8)Sr_(0.2)MnO_3颗粒在其表面的烧结,从而维持了高温下La_(0.8)Sr_(0.2)MnO_3活性组分的分散性,才是12SrO·7Al_2O_3作为蜂窝陶瓷型钙钛矿整体催化剂涂层优于γ-Al_2O_3和Sr_(0.3)Ba_(0.5)La_(0.2)MnAl_(11_O_(19)的主要原因。
其次,以堇青石为基体,12SrO·7Al_2O_3材料为涂层,采用溶液浸渍法制备了蜂窝陶瓷型CuMn_2Ce_4整体催化剂,考察了该整体催化剂的性能。结果表明,以12SrO·7Al_2O_3作为涂层的整体催化剂与无涂层的CuMn_2Ce_4整体催化剂相比,其耐高温性能有了明显提高,SEM、EDS和BET表明有涂层的整体催化剂活http://www.chinamagnets.biz/性组分较之无涂层整体催化剂更为稳定,在表面原子总数中所占比重更高。12SrO·7Al_2O_3涂层材料的存在不仅避免了CuMn_2Ce_4与堇青石发生的固相反应,保持了CuMn_2Ce_4活性组分结构和比表面积,也使得其更多的保持在催化剂的表面,从而改进了CuMn_2Ce_4整体催化剂耐高温性能。
最后,为进一步提高La_(0.8)Sr_(0.2)MnO_3活性组分的催化活性,进行了向La_(0.8)Sr_(0.2)MnO_3中掺杂贵金属钯的初步研究。结果发现当钯的掺杂量为0.8%-1.2%时活性提高最为明显。
学位年度:2010
SO_4~（2-）/M_xO_y型复合固体酸催化剂的合成、表征及其在酯化反应中的应用研究
题名:SO_4~（2-）/M_xO_y型复合固体酸催化剂的合成、表征及其在酯化反应中的应用研究
作者:黄道伟
学位授予单位:江西师范大学
关键词:复合型固体超强酸催化剂;;制备改性;;表征;;催化;;酯化
摘要:
近年来,在酸碱催化作用的研究中,固体超强酸能使许多难以进行的化学反应在很温和的条件下进行,是很有应用前景的环境友好型绿rare earth magnets色催化剂。但由于其催化活性受制备方法的影响较大,通常需要对该类催化剂的制备方法进行优化,并通过一定的表征分析技术加以监控、指导。同时将其与催化性能相关联,揭示表征结果与催化剂催化性能的关系,以此获得性能更佳的催化剂。
基于上述考虑,本文分别做了如下几方面的工作：
1.制备了Y3+改性的SO42-/ZrO2-γ-Al2O3复合型固体酸催化剂。实验表明过渡金属γ-Al2O3和稀土元素Y对ZrO2四方晶相起到了稳定作用。而ZrO2四方晶相对催化草酸和正丁醇的酯化反应具有很高的催化活性。并且将不同制备条件下的催化剂表征结果与催化活性进行了关联。催化剂重复使用良好,但稳定性还有待进一步改善。
2.制备了SO42-/TiO2/γ-Al2O3固体酸催化剂。实验表明：y-Al2O3的引入,延缓了TiO2晶型由TiO2锐钛矿晶相向TiO2金红石相转变的趋势,拓展了TiO2锐钛矿晶相稳定存在的温区。极大的改善了SO42-/TiO2的稳定性。并考察了其对顺丁烯二酸酐和异戊醇的酯化反应的催化活性,实验表明,该固体酸同样具有很强的催化活性与选择性。催化剂重复使用和稳定性良好。
3.采用微波加热均匀沉淀法制备了单斜晶型SO42-/TiO2-Zn0复合固体酸。通过微波的引入,使得TiO2晶相产生了锐钛http://www.chinamagnets.biz/矿相向单斜相再向金红石相晶型转变的过程。并考察了其对草酸和正丁醇的酯化反应的催化活性,实验表明,该固体酸同样具有极强的催化活性与选择性。催化剂重复使用和稳定性良好。
4.制备了单一板钛矿晶型SO42-/TiO2固体酸催化剂。通过单因素法考察了影响TiO2板钛矿晶相形成的原因。揭示了锐钛矿TiO2向板钛矿TiO2再向金红石TiO2晶型转化的过程。并考察了其对顺丁烯二酸酐和异戊醇的酯化反应的催化活性,实验表明,该固体酸同样具有很强的催化活性与选择性。催化剂重复使用和稳定性良好。
5.通过红外光谱(FT-IR)、X射线衍射(XRD)、热分析(TG-DTA)以及激光拉曼光谱(Raman)等表征分析技术考察了固体超强酸催化剂晶型转变的过程,实现了催化剂晶型的微观可控调节,以此获得活性、稳定性更佳的催化剂。同时将这种晶型的变化与催化剂酯化反应的催化活性进行了关联。
学位年度:2010
作者:黄道伟
学位授予单位:江西师范大学
关键词:复合型固体超强酸催化剂;;制备改性;;表征;;催化;;酯化
摘要:
近年来,在酸碱催化作用的研究中,固体超强酸能使许多难以进行的化学反应在很温和的条件下进行,是很有应用前景的环境友好型绿rare earth magnets色催化剂。但由于其催化活性受制备方法的影响较大,通常需要对该类催化剂的制备方法进行优化,并通过一定的表征分析技术加以监控、指导。同时将其与催化性能相关联,揭示表征结果与催化剂催化性能的关系,以此获得性能更佳的催化剂。
基于上述考虑,本文分别做了如下几方面的工作：
1.制备了Y3+改性的SO42-/ZrO2-γ-Al2O3复合型固体酸催化剂。实验表明过渡金属γ-Al2O3和稀土元素Y对ZrO2四方晶相起到了稳定作用。而ZrO2四方晶相对催化草酸和正丁醇的酯化反应具有很高的催化活性。并且将不同制备条件下的催化剂表征结果与催化活性进行了关联。催化剂重复使用良好,但稳定性还有待进一步改善。
2.制备了SO42-/TiO2/γ-Al2O3固体酸催化剂。实验表明：y-Al2O3的引入,延缓了TiO2晶型由TiO2锐钛矿晶相向TiO2金红石相转变的趋势,拓展了TiO2锐钛矿晶相稳定存在的温区。极大的改善了SO42-/TiO2的稳定性。并考察了其对顺丁烯二酸酐和异戊醇的酯化反应的催化活性,实验表明,该固体酸同样具有很强的催化活性与选择性。催化剂重复使用和稳定性良好。
3.采用微波加热均匀沉淀法制备了单斜晶型SO42-/TiO2-Zn0复合固体酸。通过微波的引入,使得TiO2晶相产生了锐钛http://www.chinamagnets.biz/矿相向单斜相再向金红石相晶型转变的过程。并考察了其对草酸和正丁醇的酯化反应的催化活性,实验表明,该固体酸同样具有极强的催化活性与选择性。催化剂重复使用和稳定性良好。
4.制备了单一板钛矿晶型SO42-/TiO2固体酸催化剂。通过单因素法考察了影响TiO2板钛矿晶相形成的原因。揭示了锐钛矿TiO2向板钛矿TiO2再向金红石TiO2晶型转化的过程。并考察了其对顺丁烯二酸酐和异戊醇的酯化反应的催化活性,实验表明,该固体酸同样具有很强的催化活性与选择性。催化剂重复使用和稳定性良好。
5.通过红外光谱(FT-IR)、X射线衍射(XRD)、热分析(TG-DTA)以及激光拉曼光谱(Raman)等表征分析技术考察了固体超强酸催化剂晶型转变的过程,实现了催化剂晶型的微观可控调节,以此获得活性、稳定性更佳的催化剂。同时将这种晶型的变化与催化剂酯化反应的催化活性进行了关联。
学位年度:2010
阿尔金山东段喀腊达坂铅锌矿床地质特征及成因初探
题名:阿尔金山东段喀腊达坂铅锌矿床地质特征及成因初探
作者:崔玲玲
学位授予单位:中国地质科学院
关键词:阿尔金山东段;;喀腊大湾;;喀腊达坂铅锌矿;;矿床特征;;成因分析
摘要:
矿床与构造的关系是地质科学研究的基本内容之一。板块构造演化的不同阶段和不同构造单元与不同的矿床成因类型的关系成为当前国际地学研究最新进展；构造对火山沉积成因矿床的控制作用主要体现在火山沉积的古构造rare earth magnets环境、沉积后构造(热液)的叠加矿化及破坏作用等方面。
喀腊达坂地区位于塔里木地块东南缘阿尔金山东段红柳沟—拉配泉奥陶纪裂谷带的中部,北东向阿尔金走滑断裂北侧与东西向阿尔金北缘断裂所夹持的区域。该区自上世纪90年代中期以来,取得了地质找矿重大进展。
喀腊达坂铅锌矿是该区唯一达到大型规模而矿床地质研究处于空白的铅锌多金属矿床,因此选择其作为研究对象,开展以研究构造与铅锌矿成矿关系为主题的硕士论文研究工作,对查清该地区成矿大地构造环境、火山沉积后构造变形对铅锌矿的控制作用,探讨铅锌矿床成因具有重要意义。
本文在前人工作基础上,通过详细的野外地质调查与观测,有选择地开展重点解剖和室内测试,对喀腊达坂铅锌矿的成矿大地构造背景、矿床地质特征和成因开展了初步研究,取得的主要成果和新认识如下：
1.在大地构造背景分析基础上,通过火山岩的岩石地球化学研究火山沉积古构造环境,认为外围中基性火山岩属于高钾高铁偏碱性系列岩浆岩,具有以幔源为主,受到地壳较强烈的混染作用,属于岛弧岩浆型,具有拉斑系列火山弧玄武岩性质,其形成为大洋板块俯冲作用有关的熔融成因；而矿区中酸性火山岩属于高钾钙碱性系列岩浆岩,具有板内岩浆岩的构造环境属性,形成于大洋俯冲带岛弧靠近古陆壳一侧http://www.chinamagnets.biz/的大地构造环境。
2.阐述了喀腊达坂铅锌矿的矿床地质特征,认为矿化带和矿体总体具有似层状展布、规模大、延伸稳定等特点,受火山岩特定的层位和岩性控制,矿化发育于上寒武统卓阿布拉克组第四岩性段内,以中酸性晶屑凝灰岩为最主要含矿岩性；矿石有用组分以锌为主,铅、铜、金共生,其中闪锌矿中金元素含量非常高。矿石具有微晶结晶结构,浸染状和块状构造为主
3.初步分析了构造与喀腊达坂铅锌矿的矿床的关系,认为岛弧古构造环境控制了含矿火山地层(及沉积矿体)的形成和范围,褶皱构造控制了含矿火山岩(及沉积矿体)的分布,变质变形构造对矿化的叠加改造作用不太明显,后期北西向脆性断裂右行断错破坏了矿化带和矿体的延伸。
4.以稳定同位素和稀土元素、微量元素的示踪效应研究为基础,通过对比区域构造背景和目前国内外典型的与火山岩有关的铅锌矿床的地质地球化学特征,初步探讨喀腊达坂铅锌矿床成因,认为属于火山岩型块状硫化物型(VMS)大类中的岛弧火山型块状硫化物型亚类；通过外围火山岩年龄和区域成矿作用年代学对比,结合地质分析推测矿床形成时代为早古生代中期(约500-510Ma左右)。
学位年度:2010
作者:崔玲玲
学位授予单位:中国地质科学院
关键词:阿尔金山东段;;喀腊大湾;;喀腊达坂铅锌矿;;矿床特征;;成因分析
摘要:
矿床与构造的关系是地质科学研究的基本内容之一。板块构造演化的不同阶段和不同构造单元与不同的矿床成因类型的关系成为当前国际地学研究最新进展；构造对火山沉积成因矿床的控制作用主要体现在火山沉积的古构造rare earth magnets环境、沉积后构造(热液)的叠加矿化及破坏作用等方面。
喀腊达坂地区位于塔里木地块东南缘阿尔金山东段红柳沟—拉配泉奥陶纪裂谷带的中部,北东向阿尔金走滑断裂北侧与东西向阿尔金北缘断裂所夹持的区域。该区自上世纪90年代中期以来,取得了地质找矿重大进展。
喀腊达坂铅锌矿是该区唯一达到大型规模而矿床地质研究处于空白的铅锌多金属矿床,因此选择其作为研究对象,开展以研究构造与铅锌矿成矿关系为主题的硕士论文研究工作,对查清该地区成矿大地构造环境、火山沉积后构造变形对铅锌矿的控制作用,探讨铅锌矿床成因具有重要意义。
本文在前人工作基础上,通过详细的野外地质调查与观测,有选择地开展重点解剖和室内测试,对喀腊达坂铅锌矿的成矿大地构造背景、矿床地质特征和成因开展了初步研究,取得的主要成果和新认识如下：
1.在大地构造背景分析基础上,通过火山岩的岩石地球化学研究火山沉积古构造环境,认为外围中基性火山岩属于高钾高铁偏碱性系列岩浆岩,具有以幔源为主,受到地壳较强烈的混染作用,属于岛弧岩浆型,具有拉斑系列火山弧玄武岩性质,其形成为大洋板块俯冲作用有关的熔融成因；而矿区中酸性火山岩属于高钾钙碱性系列岩浆岩,具有板内岩浆岩的构造环境属性,形成于大洋俯冲带岛弧靠近古陆壳一侧http://www.chinamagnets.biz/的大地构造环境。
2.阐述了喀腊达坂铅锌矿的矿床地质特征,认为矿化带和矿体总体具有似层状展布、规模大、延伸稳定等特点,受火山岩特定的层位和岩性控制,矿化发育于上寒武统卓阿布拉克组第四岩性段内,以中酸性晶屑凝灰岩为最主要含矿岩性；矿石有用组分以锌为主,铅、铜、金共生,其中闪锌矿中金元素含量非常高。矿石具有微晶结晶结构,浸染状和块状构造为主
3.初步分析了构造与喀腊达坂铅锌矿的矿床的关系,认为岛弧古构造环境控制了含矿火山地层(及沉积矿体)的形成和范围,褶皱构造控制了含矿火山岩(及沉积矿体)的分布,变质变形构造对矿化的叠加改造作用不太明显,后期北西向脆性断裂右行断错破坏了矿化带和矿体的延伸。
4.以稳定同位素和稀土元素、微量元素的示踪效应研究为基础,通过对比区域构造背景和目前国内外典型的与火山岩有关的铅锌矿床的地质地球化学特征,初步探讨喀腊达坂铅锌矿床成因,认为属于火山岩型块状硫化物型(VMS)大类中的岛弧火山型块状硫化物型亚类；通过外围火山岩年龄和区域成矿作用年代学对比,结合地质分析推测矿床形成时代为早古生代中期(约500-510Ma左右)。
学位年度:2010
稀土离子Eu~（3+）和Tb~（3+）掺杂MMoO_4（M=Ca，Zn，Ba）发光材料的合成及光谱特性研究
题名:稀土离子Eu~（3+）和Tb~（3+）掺杂MMoO_4（M=Ca，Zn，Ba）发光材料的合成及光谱特性研究
作者:许成科
学位授予单位:汕头大学
关键词:CaMoO_4:Eu~(3+);;ZnMoO_4:Tb~(3+);;BaMoO_4:Eu~(3+);;白光LED;;光谱特性;;荧光粉
摘要:
白光LED具有传统照明光源无法比拟的优越Strong magnets性能,其应用和发展越来越受人们重视,被称为新一代绿色照明光源。因此应用于白光LED荧光粉的制备和光谱性能研究备受关注。本文采用高温固相法合成了CaMoO_4:Eu~(3+)红色荧光粉、ZnMoO_4:Tb~(3+)绿色荧光粉和BaMoO_4:Eu~(3+)红色荧光粉,并对样品的晶体结构、光谱特性进行了研究。
在CaMoO_4基质中掺杂Eu~(3+)离子,制备了高效的红色发光材料。研究发现,Eu~(3+)离子在CaMoO_4晶格中占据Ca~(2+)离子的格位;Ca1-xEuxMoO_4的激发光谱由1个宽带峰和多个尖峰组成,宽带位于220～320nm范围,较强的两尖峰位于394nm和464nm处;通过对样品光谱的进一步分析研究,认为样品的激发宽带应归属于Mo6+—O2-的电荷迁移吸收,不属于Eu~(3+)—O2-的电荷迁移跃迁。研究了样品的发射光谱及其Eu~(3+)离子的掺杂浓度对发光强度的影响。
采用高温固相法制备了ZnMoO_4:Tb~(3+)绿色荧光粉,对样品进行了X射线衍射(XRD)和荧光光谱测定。XRD结果表明,样品在800℃时能得到单一ZnMoO_4相。激发光谱由1个宽带峰和若干个尖峰组成,宽带属于Mo6+—O2-电荷迁移吸收带(CT),并且发现宽带峰位随Tb~(3+)掺杂浓度增加而出现蓝移,尖峰属于Tb~(3+)的4f—4f跃迁,最强激发峰位于377nm处。发射光谱由四组峰组成,最强发射峰在543nm处,对应于Tb~(3+)的5D4—7F5跃迁,属于磁偶极跃迁。研究了ZnMoO_4:Tb~(3+)荧光粉在543nm的主发射峰强度随Tb~(3+)掺杂浓度的变化情况。结果显示,随Tb~(3+)浓度的增加,发射峰强度先增大;当Tb~(3+)浓度x=0.15时,峰值强度最大;而后随Tb~(3+)浓度增加,峰值强度减小。荧光寿命测试得到Tb~(3+)的5D4—7F5跃迁发射的荧光寿命值为0.506ms。光谱特性研究表明,ZnMoO_4:Tb~(3+)是一种可能应用在白光LED上的绿基色发光材料。
利用高温固相法制备了BaMoO_4:Eu~(3+)荧光粉,采用X射线衍射(XRD)、扫描电子显微镜(SEM)和荧光光谱仪对样品的性能进行了测试。XRD结果表明,在800℃时可得到BaMoO_4纯相,BaMoO_4属四方晶http://www.chinamagnets.biz/系;扫描电镜结果显示,样品颗粒形状比较规则,分散性较好,粒径在1～2μm之间。激发光谱由一个宽带和处在350nm后的若干个线状谱组成,宽带不属于MoO_42-的能量吸收带,而是归属于Eu~(3+)—O2-电荷迁移吸收带(CT),线状谱属于Eu~(3+)的f—f激发跃迁吸收。发射光谱由5D0—7F1(591nm)、5D0—7F2(615nm)、5D0—7F3(654nm)和5D0—7F4(702nm)四组峰组成,其红光5D0—7F2辐射跃迁发射最强,对应Eu~(3+)的电偶极跃迁。研究了Eu~(3+)的掺杂浓度对BaMoO_4:Eu~(3+)荧光粉在615nm处发射主峰强度的影响,发现Eu~(3+)的掺杂浓度为20mol%时,发射峰的强度具有最大值,Eu~(3+)掺杂浓度大于20mol%时,发射峰强度减小,出现浓度猝灭效应。
学位年度:2010
作者:许成科
学位授予单位:汕头大学
关键词:CaMoO_4:Eu~(3+);;ZnMoO_4:Tb~(3+);;BaMoO_4:Eu~(3+);;白光LED;;光谱特性;;荧光粉
摘要:
白光LED具有传统照明光源无法比拟的优越Strong magnets性能,其应用和发展越来越受人们重视,被称为新一代绿色照明光源。因此应用于白光LED荧光粉的制备和光谱性能研究备受关注。本文采用高温固相法合成了CaMoO_4:Eu~(3+)红色荧光粉、ZnMoO_4:Tb~(3+)绿色荧光粉和BaMoO_4:Eu~(3+)红色荧光粉,并对样品的晶体结构、光谱特性进行了研究。
在CaMoO_4基质中掺杂Eu~(3+)离子,制备了高效的红色发光材料。研究发现,Eu~(3+)离子在CaMoO_4晶格中占据Ca~(2+)离子的格位;Ca1-xEuxMoO_4的激发光谱由1个宽带峰和多个尖峰组成,宽带位于220～320nm范围,较强的两尖峰位于394nm和464nm处;通过对样品光谱的进一步分析研究,认为样品的激发宽带应归属于Mo6+—O2-的电荷迁移吸收,不属于Eu~(3+)—O2-的电荷迁移跃迁。研究了样品的发射光谱及其Eu~(3+)离子的掺杂浓度对发光强度的影响。
采用高温固相法制备了ZnMoO_4:Tb~(3+)绿色荧光粉,对样品进行了X射线衍射(XRD)和荧光光谱测定。XRD结果表明,样品在800℃时能得到单一ZnMoO_4相。激发光谱由1个宽带峰和若干个尖峰组成,宽带属于Mo6+—O2-电荷迁移吸收带(CT),并且发现宽带峰位随Tb~(3+)掺杂浓度增加而出现蓝移,尖峰属于Tb~(3+)的4f—4f跃迁,最强激发峰位于377nm处。发射光谱由四组峰组成,最强发射峰在543nm处,对应于Tb~(3+)的5D4—7F5跃迁,属于磁偶极跃迁。研究了ZnMoO_4:Tb~(3+)荧光粉在543nm的主发射峰强度随Tb~(3+)掺杂浓度的变化情况。结果显示,随Tb~(3+)浓度的增加,发射峰强度先增大;当Tb~(3+)浓度x=0.15时,峰值强度最大;而后随Tb~(3+)浓度增加,峰值强度减小。荧光寿命测试得到Tb~(3+)的5D4—7F5跃迁发射的荧光寿命值为0.506ms。光谱特性研究表明,ZnMoO_4:Tb~(3+)是一种可能应用在白光LED上的绿基色发光材料。
利用高温固相法制备了BaMoO_4:Eu~(3+)荧光粉,采用X射线衍射(XRD)、扫描电子显微镜(SEM)和荧光光谱仪对样品的性能进行了测试。XRD结果表明,在800℃时可得到BaMoO_4纯相,BaMoO_4属四方晶http://www.chinamagnets.biz/系;扫描电镜结果显示,样品颗粒形状比较规则,分散性较好,粒径在1～2μm之间。激发光谱由一个宽带和处在350nm后的若干个线状谱组成,宽带不属于MoO_42-的能量吸收带,而是归属于Eu~(3+)—O2-电荷迁移吸收带(CT),线状谱属于Eu~(3+)的f—f激发跃迁吸收。发射光谱由5D0—7F1(591nm)、5D0—7F2(615nm)、5D0—7F3(654nm)和5D0—7F4(702nm)四组峰组成,其红光5D0—7F2辐射跃迁发射最强,对应Eu~(3+)的电偶极跃迁。研究了Eu~(3+)的掺杂浓度对BaMoO_4:Eu~(3+)荧光粉在615nm处发射主峰强度的影响,发现Eu~(3+)的掺杂浓度为20mol%时,发射峰的强度具有最大值,Eu~(3+)掺杂浓度大于20mol%时,发射峰强度减小,出现浓度猝灭效应。
学位年度:2010
稀土离子Eu和Tb激活无水芒硝的发光性质研究
题名:稀土离子Eu和Tb激活无水芒硝的发光性质研究
作者:何久洋
学位授予单位:新疆师范大学
关键词:无水芒硝;;合成发光材料;;光致发光;;真空紫外光谱;;稀土离子
摘要:
新疆矿产资源极为丰富,分布十分广泛。而且新疆有许多矿物有着独特的物理性质。产自新疆艾丁盐湖的无水芒硝在300nm的激发光下呈现乳白色发光,它的光致发光谱(PL)由一个峰值大约在509nm处的宽谱带组成。通过监测在530nm处的发光获得的激发光谱由一个峰值大约在235nm处的宽谱带和覆盖了UV和可见光区波长Strong magnets的平坦谱带组成。天然无水芒硝还具有余辉特性。它的PL衰减曲线由一个寿命小于0.1μs的快衰减成分和一个半衰时间大约0.4s的慢衰减成分组成。所以,本文以天然无水芒硝为研究基础,通过掺杂Eu和Tb合成两种新型荧光粉。通过粉晶X射线衍射光谱、激发光谱和发射光谱、同步辐射真空紫外光谱等研究手段,研究了它们的发光性质。通过热处理、辐照处理等手段提高它们的发光效率。为开发和研制新型发光材料提供理论依据和技术指导。
鉴于此,本文的主要研究的内容如下:
1.在空气中900℃温度下,对纯无水天然芒硝(Na2SO4)和EuF3的混合粉末加热20分钟,制备了Na_2SO_4:Eu发光材料。并测量了在室温下合成和γ射线辐照后荧光体的发射和激发光谱。在394 nm激发光下的发射光谱是由Eu~(3+)中~5D0→~7FJ(J=0,1,2,…5)跃迁产生的强窄带组成。而在340 nm的激发下的PL发射光谱由Eu~(2+)峰值在435 nm处的谱带组成。通过监测紫色发光得到的激发光谱包括峰值约在261 nm的弱谱带和峰值约在338 nm的Eu~(2+)宽带。随着掺杂浓度增加,Eu~(2+)的发光逐渐减弱而Eu~(3+)的发光逐渐增强。在46KGy的γ射线辐照后荧光体的相对发光效率是非辐照荧光http://www.chinamagnets.biz/体的3倍。被γ射线辐照后紫色发光增强的原因是Na_2SO_4的Eu~(3+)转化成为Eu~(2+)。
3.本文测量了在室温中Na_2SO_4:Tb在真空紫外-紫外光下的发射和激发光谱。发射光谱有一系列由于~5D_4→~7F_J和~5D_3→~7F_J跃迁生成的峰。通过监测542 nm处发光得到的激发光谱,分别由Tb~(3+)离子4f~n→4f~(n-1)5d跃迁(187、193和218 nm),基质吸收(165、200、240 nm)引起的强激发谱,和禁戒的f-f跃迁产生的弱激发谱组成。在掺杂的TbF_3浓度0.1-1.5 mol%范围内,随着掺杂Tb~(3+)离子浓度的增加,真空紫外区的激发光谱相应的增强。
学位年度:2010
作者:何久洋
学位授予单位:新疆师范大学
关键词:无水芒硝;;合成发光材料;;光致发光;;真空紫外光谱;;稀土离子
摘要:
新疆矿产资源极为丰富,分布十分广泛。而且新疆有许多矿物有着独特的物理性质。产自新疆艾丁盐湖的无水芒硝在300nm的激发光下呈现乳白色发光,它的光致发光谱(PL)由一个峰值大约在509nm处的宽谱带组成。通过监测在530nm处的发光获得的激发光谱由一个峰值大约在235nm处的宽谱带和覆盖了UV和可见光区波长Strong magnets的平坦谱带组成。天然无水芒硝还具有余辉特性。它的PL衰减曲线由一个寿命小于0.1μs的快衰减成分和一个半衰时间大约0.4s的慢衰减成分组成。所以,本文以天然无水芒硝为研究基础,通过掺杂Eu和Tb合成两种新型荧光粉。通过粉晶X射线衍射光谱、激发光谱和发射光谱、同步辐射真空紫外光谱等研究手段,研究了它们的发光性质。通过热处理、辐照处理等手段提高它们的发光效率。为开发和研制新型发光材料提供理论依据和技术指导。
鉴于此,本文的主要研究的内容如下:
1.在空气中900℃温度下,对纯无水天然芒硝(Na2SO4)和EuF3的混合粉末加热20分钟,制备了Na_2SO_4:Eu发光材料。并测量了在室温下合成和γ射线辐照后荧光体的发射和激发光谱。在394 nm激发光下的发射光谱是由Eu~(3+)中~5D0→~7FJ(J=0,1,2,…5)跃迁产生的强窄带组成。而在340 nm的激发下的PL发射光谱由Eu~(2+)峰值在435 nm处的谱带组成。通过监测紫色发光得到的激发光谱包括峰值约在261 nm的弱谱带和峰值约在338 nm的Eu~(2+)宽带。随着掺杂浓度增加,Eu~(2+)的发光逐渐减弱而Eu~(3+)的发光逐渐增强。在46KGy的γ射线辐照后荧光体的相对发光效率是非辐照荧光http://www.chinamagnets.biz/体的3倍。被γ射线辐照后紫色发光增强的原因是Na_2SO_4的Eu~(3+)转化成为Eu~(2+)。
3.本文测量了在室温中Na_2SO_4:Tb在真空紫外-紫外光下的发射和激发光谱。发射光谱有一系列由于~5D_4→~7F_J和~5D_3→~7F_J跃迁生成的峰。通过监测542 nm处发光得到的激发光谱,分别由Tb~(3+)离子4f~n→4f~(n-1)5d跃迁(187、193和218 nm),基质吸收(165、200、240 nm)引起的强激发谱,和禁戒的f-f跃迁产生的弱激发谱组成。在掺杂的TbF_3浓度0.1-1.5 mol%范围内,随着掺杂Tb~(3+)离子浓度的增加,真空紫外区的激发光谱相应的增强。
学位年度:2010
（Ba，Sr）TiO_3基无铅陶瓷介电材料的研究
题名:（Ba，Sr）TiO_3基无铅陶瓷介电材料的研究
作者:王奕
学位授予单位:天津大学
关键词:钛酸锶钡;;掺杂改性;;介电性能;;氧化钕;;五氧化二钒
摘要:
本课题选取钛酸锶钡为主晶相,以稀土元素氧化物(氧化钕及氧化锑)、氧化镁和氧化锌等作为掺杂剂,采用传统固相法烧结,系统研究了氧化钕掺杂量、碳酸锶加入量、原料(碳酸钡及二氧化钛)纯度与五氧化二钒掺杂量对陶瓷微观结构及介电性能的影响。
采用XRD测试了工业纯原料组成、陶瓷试样组成,利用YY 2811型Automatic LCR Meter 4225测试了频率为1kHz的条件下试Strong magnets样的介电性能(包括电容量C、介质损耗因数D),并测试了试样在-25℃-+100℃温度范围内的电容量。
实验结果表明：(一)在BST基陶瓷中掺杂Nd2O3, Nd3+同时对Ba2+与Ti4+发生取代,当对B位Ti4+的取代达到饱和后,主要发生对A位的取代。由此取代方式导致试样的介电常数与损耗随Nd2O3掺杂量的增大均呈先减小后增大趋势,介电常数温度曲线则逐渐变得平缓,居里温度前移；(二)随着SrCO3加入量的增大,试样的介电常数与介电损耗都呈减小趋势,介电常数温度变化率先减小后增大,居里温度逐渐向低温方向移动；(三)随着工业纯二氧化钛加入量的增大,试样的介电常数、损耗及介电常数温度变化率均呈下降趋势,且出现了低居里点的Ba0.77Sr0.23TiO3,导致试样居里温度逐渐降低,但工业纯二氧化钛中杂质含量较少,因而杂质对试样介电性能影响较小；(四)工业http://www.chinamagnets.biz/碳酸钡中含有多种复杂化合物,由于杂质的作用,随着工业纯碳酸钡加入比例的增大,试样的介电常数先减小后增大,介电损耗呈下降趋势,高温变化率逐渐减小,低温变化率则先减小后增大；(五)在原料中掺加V2O5,由于V2O5可以促进烧结,因而试样的介电常数与介电损耗均减小,Tc前移,最佳烧结温度下降。
学位年度:2010
作者:王奕
学位授予单位:天津大学
关键词:钛酸锶钡;;掺杂改性;;介电性能;;氧化钕;;五氧化二钒
摘要:
本课题选取钛酸锶钡为主晶相,以稀土元素氧化物(氧化钕及氧化锑)、氧化镁和氧化锌等作为掺杂剂,采用传统固相法烧结,系统研究了氧化钕掺杂量、碳酸锶加入量、原料(碳酸钡及二氧化钛)纯度与五氧化二钒掺杂量对陶瓷微观结构及介电性能的影响。
采用XRD测试了工业纯原料组成、陶瓷试样组成,利用YY 2811型Automatic LCR Meter 4225测试了频率为1kHz的条件下试Strong magnets样的介电性能(包括电容量C、介质损耗因数D),并测试了试样在-25℃-+100℃温度范围内的电容量。
实验结果表明：(一)在BST基陶瓷中掺杂Nd2O3, Nd3+同时对Ba2+与Ti4+发生取代,当对B位Ti4+的取代达到饱和后,主要发生对A位的取代。由此取代方式导致试样的介电常数与损耗随Nd2O3掺杂量的增大均呈先减小后增大趋势,介电常数温度曲线则逐渐变得平缓,居里温度前移；(二)随着SrCO3加入量的增大,试样的介电常数与介电损耗都呈减小趋势,介电常数温度变化率先减小后增大,居里温度逐渐向低温方向移动；(三)随着工业纯二氧化钛加入量的增大,试样的介电常数、损耗及介电常数温度变化率均呈下降趋势,且出现了低居里点的Ba0.77Sr0.23TiO3,导致试样居里温度逐渐降低,但工业纯二氧化钛中杂质含量较少,因而杂质对试样介电性能影响较小；(四)工业http://www.chinamagnets.biz/碳酸钡中含有多种复杂化合物,由于杂质的作用,随着工业纯碳酸钡加入比例的增大,试样的介电常数先减小后增大,介电损耗呈下降趋势,高温变化率逐渐减小,低温变化率则先减小后增大；(五)在原料中掺加V2O5,由于V2O5可以促进烧结,因而试样的介电常数与介电损耗均减小,Tc前移,最佳烧结温度下降。
学位年度:2010
邻氨基对苯二甲酸类希夫碱配位聚合物的合成、表征及抑菌活性研究
题名:邻氨基对苯二甲酸类希夫碱配位聚合物的合成、表征及抑菌活性研究
作者:王玉芳
学位授予单位:中国海洋大学
关键词:邻氨基对苯二甲酸;;希夫碱;;配位聚合物;;合成与表征;;荧光;;抑菌活性
摘要:
希夫碱及其金属配位聚合物具有独特的物理和化学性质,并且应用广泛,一直激发着广大学者的研究兴趣。合成新型的希夫碱配位聚合物,并研究其性质和应用,具有重要的意义。
邻氨基对苯二甲酸是一种重要的有机合成中间体,含有两个与苯环相连的—COOH,是合成苯胺共聚物的有趣的单体。本论文选择配位方式多变的芳香族二羧酸类物质邻氨基对苯二甲酸与各种醛缩合形成希夫碱配体,进而与不Neodymium Magnets同金属离子形成配位聚合物,合成了3个系列12种希夫碱配位聚合物,包括一种配合物单晶。通过元素分析、红外光谱、紫外光谱、核磁共振氢谱、X-射线单晶衍射、热分析、电导率分析、凝胶渗透色谱(GPC)等手段对合成的配体及配位聚合物进行了表征,推测了其可能的结构,对配体和部分配位聚合物进行了荧光光谱分析和抑菌活性研究。
培养得到了邻氨基对苯二甲酸缩2-羟基-1-萘醛(H3L1)与醋酸铜配位聚合物晶体,通过X-射线单晶衍射测定了其结构。结果表明：该配合物化学式为Cu(C19H]]NO5)n·n(C2H6O),属正交晶系,空间点群Pbca,晶胞参数为：a=8.7745 (18)A,b=18.613(4)A,c=24.644(5)A,α=90°,β=90°,γ=90°,V=4024.9(14) nm3,Z=8,dcalcd=1.462 g·cm-3,R1=0.0521,wR2:0.1647(total reflections),中心Cu(Ⅱ)离子处于5配位的环境中,为变形四方锥结构。配体中的羧基氧作为桥联原子与金属离子结合,形成了一个二维的配位聚合物。
邻氨基对苯二甲酸缩2-羟基-1-萘醛(H3L1)与其它过渡金属形成的配合物组成分别为[C19H11NO5Co]n·3nH2O.[C19H10NO5Zn]n·3nH2O. [C19H11NO5Cd]n·3nH2O.
邻氨基对苯二甲酸缩邻香草醛(H3L2)与过渡金属形成的配合物组成分别为：[C]6H10O6NCu]n·2nH2O.[C16H10O6NCO2]n·3nH2O.[C16H1006NMn12]n'nH2O. [C16H10O6NNi2]n·nH2O
邻氨基对苯二甲酸缩水杨醛(H3L3)与过渡或稀土金属形成的配合物组成分别为：[C15H9NO5Cu]N·n(CH3CH2OH)(H2O),[C15H8NO5CO2·4H2O]n, [C15H8NO5Ce·(NO3)2]n·n(CH3CH2OH),[C15H8NO5Ce·(NO3)2]n·n(CH3CH2OH).
合成的配位聚合物均为有颜色粉末状物质,在空气中能稳定存在。所合成的配体中-C=N-的氮原子、苯环酚羟基的氧原子、羧基的氧原子都参与了配位。水分子、溶剂分子通常参与配位或以结晶形式存在；羧基http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets 以单齿或双齿形式配位；硝酸根以单齿形式配位。
利用Achar微分法和Coats-Redfem积分法,设计了数据处理程序,分别对30种热分解动力学方程进行了拟合,对部分配位聚合物进行了非等温热分解动力学处理,得出了这些配合物的某步热分解反应机理、相应的动力学参数及其非等温热分解动力学方程,求出了活化熵ΔS≠和活化吉布斯函数ΔG≠,结果如下：
配合物[C19H11NO5Cd]n·3nH20第二步热分解的动力学函数为：?(α)=1/2(1-α)[-1n(1-α)]-1,热分解速率的动力学方程为：da/dt=A·exp(-E/RT)·f(α)= A·exp(-E/RT):?(α)=1/2(1-α)[-1n(1-α)]-1,E=664.7 kJ·mol-1,lnA=110.4,r=0.9975,△S≠=666.1J·mol-1·k-1,△G≠210.4 kJ·mol-1。
配合物[C16H10O6NCO2]n·3nH20第一步热分解的动力学函数为：?(α)=1/4(1-α)[-1n(1-α)]-3,热分解速率的动力学方程为：da/dt=A·exp(-E/RT)·f(α)= A·exp(-E/RT)·1/4(1-α)[-1n(1-α)]-3,E=222.7 kJ.mol-1,lnA=67.97,r=0.9975,△S≠=318.6 J·mol-1·k-1,△G≠=107.1 kJ·mol-1。
配合物[C15H8NO5CO2·4H2O]n第一步热分解的动力学函数为：?(α)=1/4(1-α)[-1n(1-α)]-3,热分解速率的动力学方程为：da/dt=A·exp(-E/RT)·f(α)= A·exp(-E/RT)·1/4(1-α)[-1n(1-α)]-3,E=343.8 kJ·mol-1,nA=79.93,r=0.9871,△S≠=416.0 J·mol-1·k-1,△G≠=152.4 kJ·mol-1。
对配体及部分配位聚合物的荧光性质进行了研究,配合物[C15H8NO5CO2·4H2O]n.[C19H11NO5 Cd]n·3nH20.[Cu(C19H11NO5)]n·n(C2H60). [C]6H10O6NCu]n·2nH20溶液荧光光谱的激发峰和发射峰λex/λem分别为：366.8 nm/438.6 nm.372 nm/493 nm.368 nm/487 nm.368 nm/476 nm,与配体相比,除[C15H8NO5CO2·4H2O]n外,配合物的激发峰和发射峰位置均发生了一定程度的改变,且所有Cu(Ⅱ)配合物的荧光强度明显减弱。
采用分光光度法对配体和Cu(II)配位聚合物的抑菌活性进行了研究,结果表明,配合物的抑菌效果明显优于其配体的抑菌效果；相对于其它几种配合物,[C15H9NO5Cu]n·n(CH3CH2OH)(H2O)与[C16H10O6NCu]n·2nH2O分别对金黄色葡萄球菌和大肠杆菌的抑菌效果较好,且抑菌活性与其浓度正相关。
学位年度:2010
作者:王玉芳
学位授予单位:中国海洋大学
关键词:邻氨基对苯二甲酸;;希夫碱;;配位聚合物;;合成与表征;;荧光;;抑菌活性
摘要:
希夫碱及其金属配位聚合物具有独特的物理和化学性质,并且应用广泛,一直激发着广大学者的研究兴趣。合成新型的希夫碱配位聚合物,并研究其性质和应用,具有重要的意义。
邻氨基对苯二甲酸是一种重要的有机合成中间体,含有两个与苯环相连的—COOH,是合成苯胺共聚物的有趣的单体。本论文选择配位方式多变的芳香族二羧酸类物质邻氨基对苯二甲酸与各种醛缩合形成希夫碱配体,进而与不Neodymium Magnets同金属离子形成配位聚合物,合成了3个系列12种希夫碱配位聚合物,包括一种配合物单晶。通过元素分析、红外光谱、紫外光谱、核磁共振氢谱、X-射线单晶衍射、热分析、电导率分析、凝胶渗透色谱(GPC)等手段对合成的配体及配位聚合物进行了表征,推测了其可能的结构,对配体和部分配位聚合物进行了荧光光谱分析和抑菌活性研究。
培养得到了邻氨基对苯二甲酸缩2-羟基-1-萘醛(H3L1)与醋酸铜配位聚合物晶体,通过X-射线单晶衍射测定了其结构。结果表明：该配合物化学式为Cu(C19H]]NO5)n·n(C2H6O),属正交晶系,空间点群Pbca,晶胞参数为：a=8.7745 (18)A,b=18.613(4)A,c=24.644(5)A,α=90°,β=90°,γ=90°,V=4024.9(14) nm3,Z=8,dcalcd=1.462 g·cm-3,R1=0.0521,wR2:0.1647(total reflections),中心Cu(Ⅱ)离子处于5配位的环境中,为变形四方锥结构。配体中的羧基氧作为桥联原子与金属离子结合,形成了一个二维的配位聚合物。
邻氨基对苯二甲酸缩2-羟基-1-萘醛(H3L1)与其它过渡金属形成的配合物组成分别为[C19H11NO5Co]n·3nH2O.[C19H10NO5Zn]n·3nH2O. [C19H11NO5Cd]n·3nH2O.
邻氨基对苯二甲酸缩邻香草醛(H3L2)与过渡金属形成的配合物组成分别为：[C]6H10O6NCu]n·2nH2O.[C16H10O6NCO2]n·3nH2O.[C16H1006NMn12]n'nH2O. [C16H10O6NNi2]n·nH2O
邻氨基对苯二甲酸缩水杨醛(H3L3)与过渡或稀土金属形成的配合物组成分别为：[C15H9NO5Cu]N·n(CH3CH2OH)(H2O),[C15H8NO5CO2·4H2O]n, [C15H8NO5Ce·(NO3)2]n·n(CH3CH2OH),[C15H8NO5Ce·(NO3)2]n·n(CH3CH2OH).
合成的配位聚合物均为有颜色粉末状物质,在空气中能稳定存在。所合成的配体中-C=N-的氮原子、苯环酚羟基的氧原子、羧基的氧原子都参与了配位。水分子、溶剂分子通常参与配位或以结晶形式存在；羧基http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets 以单齿或双齿形式配位；硝酸根以单齿形式配位。
利用Achar微分法和Coats-Redfem积分法,设计了数据处理程序,分别对30种热分解动力学方程进行了拟合,对部分配位聚合物进行了非等温热分解动力学处理,得出了这些配合物的某步热分解反应机理、相应的动力学参数及其非等温热分解动力学方程,求出了活化熵ΔS≠和活化吉布斯函数ΔG≠,结果如下：
配合物[C19H11NO5Cd]n·3nH20第二步热分解的动力学函数为：?(α)=1/2(1-α)[-1n(1-α)]-1,热分解速率的动力学方程为：da/dt=A·exp(-E/RT)·f(α)= A·exp(-E/RT):?(α)=1/2(1-α)[-1n(1-α)]-1,E=664.7 kJ·mol-1,lnA=110.4,r=0.9975,△S≠=666.1J·mol-1·k-1,△G≠210.4 kJ·mol-1。
配合物[C16H10O6NCO2]n·3nH20第一步热分解的动力学函数为：?(α)=1/4(1-α)[-1n(1-α)]-3,热分解速率的动力学方程为：da/dt=A·exp(-E/RT)·f(α)= A·exp(-E/RT)·1/4(1-α)[-1n(1-α)]-3,E=222.7 kJ.mol-1,lnA=67.97,r=0.9975,△S≠=318.6 J·mol-1·k-1,△G≠=107.1 kJ·mol-1。
配合物[C15H8NO5CO2·4H2O]n第一步热分解的动力学函数为：?(α)=1/4(1-α)[-1n(1-α)]-3,热分解速率的动力学方程为：da/dt=A·exp(-E/RT)·f(α)= A·exp(-E/RT)·1/4(1-α)[-1n(1-α)]-3,E=343.8 kJ·mol-1,nA=79.93,r=0.9871,△S≠=416.0 J·mol-1·k-1,△G≠=152.4 kJ·mol-1。
对配体及部分配位聚合物的荧光性质进行了研究,配合物[C15H8NO5CO2·4H2O]n.[C19H11NO5 Cd]n·3nH20.[Cu(C19H11NO5)]n·n(C2H60). [C]6H10O6NCu]n·2nH20溶液荧光光谱的激发峰和发射峰λex/λem分别为：366.8 nm/438.6 nm.372 nm/493 nm.368 nm/487 nm.368 nm/476 nm,与配体相比,除[C15H8NO5CO2·4H2O]n外,配合物的激发峰和发射峰位置均发生了一定程度的改变,且所有Cu(Ⅱ)配合物的荧光强度明显减弱。
采用分光光度法对配体和Cu(II)配位聚合物的抑菌活性进行了研究,结果表明,配合物的抑菌效果明显优于其配体的抑菌效果；相对于其它几种配合物,[C15H9NO5Cu]n·n(CH3CH2OH)(H2O)与[C16H10O6NCu]n·2nH2O分别对金黄色葡萄球菌和大肠杆菌的抑菌效果较好,且抑菌活性与其浓度正相关。
学位年度:2010
2011年12月26日星期一
Heat treatment after forging of magnesium alloy and the properties
Title: Heat treatment after forging of magnesium alloy and the properties Author: Zhu Qian Degree-granting units: Chongqing University Key words: magnesium alloy;; deformation;; microstructure;; mechanical properties;; artificial aging Summary:
Magnesium alloy light weight, high strength, good damping, etc., are widely used in industry, and AZ series magnesium alloys because of its high deformation of the deformation process performance and become the most important industrial application of Magnetic lifter wrought magnesium alloys.
As a "composite molding process of extrusion forging" patented technology part of the study, this paper adopts the aging process hardness testing, metallographic observation, X-diffraction (XRD), tensile test, scanning electron microscopy (SEM) fracture surface analysis methods, focusing on the extruded AZ81, AZ61, AZ61E material by molding deformation and aging heat treatment after molding material during thermal aging behavior, microstructure evolution, changes in mechanical properties and fracture failure mechanism for forming composite extrusion forging process to produce high-toughness magnesium alloy parts lay the basis for regulation and properties.
The results show that:
① isothermal forging can significantly improve the alloy's mechanical properties. In this study, by taking 60% of AZ81 deformation, the deformation temperature at 400 ℃, 5.6mm / s deformation rate conditions on the specimen shape isothermal forging, forging further enhance the strength of the specimens, the tensile strength alloy to 337.6MPa, yield strength of 227.9MPa, extension rate of 15.83%, hardness (HRE) 74.8.
② state isothermal forging material AZ81 at 400 ℃ × 0.5h solution +200 ℃ × 20h artificial aging, the alloy to harden peak (HRE) 86.7, the best mechanical properties, tensile strength alloy to 355.8MPa, the yield strength of 255.28MPa, extension rate of 10.3%. On the mechanical properties after artificial aging analysis, tensile strength and yield strength at first increased, then decreased again with the extended holding time, the elongation is reduced as the holding time has been extended, but at low temperatures reduce the rate of 150 ℃ smallest decrease with increasing temperature the rate is increasing. Alloy phase within the β-Mg17Al12 within the grain and grain http://www.999magnet.com/products/131-magnetic-lifter boundary diffusion precipitation. Room temperature tensile specimen fracture, when the forging into the cleavage fracture toughness after heat treatment fracture ductile-brittle mixture.
③ In the AZ61 prepared by adding rare earth on the basis of the isothermal forging state materials AZ61E solution at 400 ℃ × 0.5h +200 ℃ × 15h artificial aging (T6) treatment, hardening alloy to peak (HRE) 75.8, the best mechanical properties , alloy tensile strength to 304.78MPa, the yield strength of 258.73MPa, extension rate of 9.12%.
④ AZ61 Ce rare-earth to join in, because of Al's "pinning" makes Al4Ce phase diffusion rate greatly reduced, α-Mg in the Al concentration decreases, the hardness of the AZ61 magnesium alloy peak lag, and mechanical properties compared with AZ61 decreased, but the elongation of AZ61 smaller than the decline. Degree Year: 2010
Magnesium alloy light weight, high strength, good damping, etc., are widely used in industry, and AZ series magnesium alloys because of its high deformation of the deformation process performance and become the most important industrial application of Magnetic lifter wrought magnesium alloys.
As a "composite molding process of extrusion forging" patented technology part of the study, this paper adopts the aging process hardness testing, metallographic observation, X-diffraction (XRD), tensile test, scanning electron microscopy (SEM) fracture surface analysis methods, focusing on the extruded AZ81, AZ61, AZ61E material by molding deformation and aging heat treatment after molding material during thermal aging behavior, microstructure evolution, changes in mechanical properties and fracture failure mechanism for forming composite extrusion forging process to produce high-toughness magnesium alloy parts lay the basis for regulation and properties.
The results show that:
① isothermal forging can significantly improve the alloy's mechanical properties. In this study, by taking 60% of AZ81 deformation, the deformation temperature at 400 ℃, 5.6mm / s deformation rate conditions on the specimen shape isothermal forging, forging further enhance the strength of the specimens, the tensile strength alloy to 337.6MPa, yield strength of 227.9MPa, extension rate of 15.83%, hardness (HRE) 74.8.
② state isothermal forging material AZ81 at 400 ℃ × 0.5h solution +200 ℃ × 20h artificial aging, the alloy to harden peak (HRE) 86.7, the best mechanical properties, tensile strength alloy to 355.8MPa, the yield strength of 255.28MPa, extension rate of 10.3%. On the mechanical properties after artificial aging analysis, tensile strength and yield strength at first increased, then decreased again with the extended holding time, the elongation is reduced as the holding time has been extended, but at low temperatures reduce the rate of 150 ℃ smallest decrease with increasing temperature the rate is increasing. Alloy phase within the β-Mg17Al12 within the grain and grain http://www.999magnet.com/products/131-magnetic-lifter boundary diffusion precipitation. Room temperature tensile specimen fracture, when the forging into the cleavage fracture toughness after heat treatment fracture ductile-brittle mixture.
③ In the AZ61 prepared by adding rare earth on the basis of the isothermal forging state materials AZ61E solution at 400 ℃ × 0.5h +200 ℃ × 15h artificial aging (T6) treatment, hardening alloy to peak (HRE) 75.8, the best mechanical properties , alloy tensile strength to 304.78MPa, the yield strength of 258.73MPa, extension rate of 9.12%.
④ AZ61 Ce rare-earth to join in, because of Al's "pinning" makes Al4Ce phase diffusion rate greatly reduced, α-Mg in the Al concentration decreases, the hardness of the AZ61 magnesium alloy peak lag, and mechanical properties compared with AZ61 decreased, but the elongation of AZ61 smaller than the decline. Degree Year: 2010
East Kunlun Dulan cocoa sand - Section can be special mafic - ultramafic rocks of the geological features, age and tectonic significance of the formation of
Title: East Kunlun Dulan cocoa sand - Section can be special mafic - ultramafic rocks of the geological features, age and tectonic significance of the formation ofAuthors: Feng YunDegree-granting units: Chang'an UniversityKeywords: mafic - ultramafic rocks;; LA-ICP-MS zircon U-Pb age;; SSZ-type ophiolite;; back-arc spreading small ocean basin;; early Paleozoic;; Dulan cocoa sand;; East Kunlun orogenic beltSummary:
East Kunlun orogenic belt is a complex continent, including a number of important tectonic suture zone. Author in the East Kunlun area west of the eastern section of water springs are blue cocoa sand - Section can be special areas of the west side of the Dawa Te 1:50000 regional geological investigation, we found a set of predecessors have not reported mafic - ultramafic rock belt, ophiolite Qingshuiquan suspected part. The study of the combination of sets rock the Neodymium Magnets East Kunlun area will help to solve a lot of controversy of the early Paleozoic tectonic framework issues, and further explore the eastern section of the East Kunlun Mountains area in the early Paleozoic tectonic evolution history.
In this paper the theory of plate tectonics and continental dynamics to explore the guiding ideology for academic research, by field geological mapping and rock samples for detailed indoor testing and analysis, and the set of combinations of wild rock geology, petrology, geochemistry and isotopic dating systems in such areas as research, mainly to obtain the following understanding:
1, East Kunlun Dulan cocoa sand - Section can identify a set of special regional mafic - ultramafic rocks, rocks are mainly serpentinized peridotite, lherzolite, pyroxenite and gabbro, alteration of basalt.
2, the combination of mafic rocks are oceanic island arc tholeiite and calc-alkaline basalt transition type, the more enriched Rb, Ba and other large ion lithophile elements, light and heavy REE fractionation is more obvious, and T-MORB-type transition characteristics of mid-ocean ridge basalts are similar; and ultramafic rocks are alkali for the poor performance of high-magnesium iron, enriched Rb, Ba, Nb, Ta and Cr and other elements, light and heavy REE fractionation obvious that the continental crust by mixing stained more strongly, and from a more enriched mantle source oceanic lithosphere.
3, the sets of rocks are believed to be a typical Yanyan dismembered ophiolite block, most likely formed in a back-arc basin or a small ocean basin ridge expansion environment, according to the ophiolite SSZ-type or category should belong to the East Mediterranean type.
4, the isotopic age of gabbro test limit its LA-ICP-MS zircon U-Pb age of (509.4 ± 6.8) Ma (MSWD = 1.4), indicating the formation of the Early Paleozoic in the Cambrian;
5, mafic - ultramafic rocks with a combination of rock and spring water has the same ophiolite formation age and similar geochemical characteristics, therefore, should be under the water to be dismembered ophiolite spring as part of that spring water http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets ophiolite space west direction along the Nan Xixi Spread.
6, East Kunlun Qingshuiquan - Cocoa sand in the region in the Early Paleozoic Cambrian there is an expansion of the small ocean basin, most likely after the Rodinia supercontinent cracked by the former East Kunlun eastern edge of the Tethys expansion.Degree Year: 2010
East Kunlun orogenic belt is a complex continent, including a number of important tectonic suture zone. Author in the East Kunlun area west of the eastern section of water springs are blue cocoa sand - Section can be special areas of the west side of the Dawa Te 1:50000 regional geological investigation, we found a set of predecessors have not reported mafic - ultramafic rock belt, ophiolite Qingshuiquan suspected part. The study of the combination of sets rock the Neodymium Magnets East Kunlun area will help to solve a lot of controversy of the early Paleozoic tectonic framework issues, and further explore the eastern section of the East Kunlun Mountains area in the early Paleozoic tectonic evolution history.
In this paper the theory of plate tectonics and continental dynamics to explore the guiding ideology for academic research, by field geological mapping and rock samples for detailed indoor testing and analysis, and the set of combinations of wild rock geology, petrology, geochemistry and isotopic dating systems in such areas as research, mainly to obtain the following understanding:
1, East Kunlun Dulan cocoa sand - Section can identify a set of special regional mafic - ultramafic rocks, rocks are mainly serpentinized peridotite, lherzolite, pyroxenite and gabbro, alteration of basalt.
2, the combination of mafic rocks are oceanic island arc tholeiite and calc-alkaline basalt transition type, the more enriched Rb, Ba and other large ion lithophile elements, light and heavy REE fractionation is more obvious, and T-MORB-type transition characteristics of mid-ocean ridge basalts are similar; and ultramafic rocks are alkali for the poor performance of high-magnesium iron, enriched Rb, Ba, Nb, Ta and Cr and other elements, light and heavy REE fractionation obvious that the continental crust by mixing stained more strongly, and from a more enriched mantle source oceanic lithosphere.
3, the sets of rocks are believed to be a typical Yanyan dismembered ophiolite block, most likely formed in a back-arc basin or a small ocean basin ridge expansion environment, according to the ophiolite SSZ-type or category should belong to the East Mediterranean type.
4, the isotopic age of gabbro test limit its LA-ICP-MS zircon U-Pb age of (509.4 ± 6.8) Ma (MSWD = 1.4), indicating the formation of the Early Paleozoic in the Cambrian;
5, mafic - ultramafic rocks with a combination of rock and spring water has the same ophiolite formation age and similar geochemical characteristics, therefore, should be under the water to be dismembered ophiolite spring as part of that spring water http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets ophiolite space west direction along the Nan Xixi Spread.
6, East Kunlun Qingshuiquan - Cocoa sand in the region in the Early Paleozoic Cambrian there is an expansion of the small ocean basin, most likely after the Rodinia supercontinent cracked by the former East Kunlun eastern edge of the Tethys expansion.Degree Year: 2010
East Kunlun edge of the cloth Castle effective Stein ophiolite geology, age and tectonic environment of formation
Title: East Kunlun edge of the cloth Castle effective Stein ophiolite geology, age and tectonic environment of formationAuthor: Yu SunDegree-granting units: Chang'an UniversityKeywords: effective Stan ophiolite;; ancient ocean basin;; geochemistry;; LA-ICP-MS zircon U-Pb dating;; early Paleozoic;; original Tethys;; Animaqing - cloth Castle Peak tectonic belt;; East Kunlun edgeSummary:
Stan effective in the East Kunlun ophiolite edge Animaqing - Castle Peak tectonic belt western cloth, separating the north and south of the eastern Kunlun orogenic belt Hoh Xil - Bayan Har orogenic belt. In this paper, cloth Castle Peak area ophiolite Stan effective for the study, through detailed field line survey, focus and profile measurement system for analysis of indoor microscopic thin, ophiolites Stan on effective field distribution, an extension of the direction, size Neodymium Magnets and occurrence and rock assemblages, petrographic features in detail. Meanwhile, representative samples of the rock geochemical and isotopic dating test test, from geochemical and isotope geochronology of the effective aspects of Stan ophiolite tectonic environment and age, to obtain an initial understanding of the following:
Effective direction of Stan ophiolite extends to the North West, parallel to the East Kunlun fault. Ophiolite rock assemblages within the more complete, the south side of the bottom of the mantle rocks are altered by the dark green harzburgite (serpentinite), lherzolite composition, was constructed with the contact between the rock; diabase porphyrite were interspersed with rock-like dikes in serpentinite, the rock pulse width of 0.5m ~ 6m; north appear dark gray massive gabbro, cumulates is not obvious, and was constructed south of serpentinite contact relationship; most The upper part of gray-black basalt alteration, local shows pillow structure, was constructed with the gabbro contact relationships; ophiolite overlying sedimentary rocks of the deep gray-black silty mudstone, and the fault contact between the basalt.
Effective combination of Stan ophiolite serpentinite range of SiO2 content smaller, low-Ti depleted magnesium-rich potassium and sodium; http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets gabbro and diabase porphyry belong to the sub-alkaline series, the diagrams are located in the ACM mafic accumulation of rocky; sub-alkaline basalts are tholeiitic basalt series. Effective Stein ophiolite meta-peridotite chondrite-normalized curves are open "U" shape, cumulate peridotite slightly depleted LREE flat type; gabbro, diabase and basalt porphyry chondrite-normalized REE curves are very similar, are LREE depleted. In primitive mantle-normalized trace element on the curve, effective Stan ophiolite rock units in the large ion lithophile elements fluctuates significantly, the high field strength elements are relatively flat, without Nb, Ta, Ti losses, indicating that almost no continental crust by mixing dye, no island arc and oceanic island rock characteristics, and effective ingredients are very similar to the normal basalt Stan-ocean ridge basalt. Geochemical analysis shows that more effective Stein ophiolite probably formed in the normal mid-ocean ridge tectonic environment.
Effective Stein ophiolite gabbro of LA-ICP-MS zircon U-Pb weighted average age of (516.4 ± 6.3) Ma, shows effective Stein ophiolite formed in the early Cambrian, suggesting that the East Kunlun edge Animaqing - cloth Castle Tethyan tectonic belt is not only the existence of ophiolite, there are early Paleozoic Proto-Tethys ophiolite.
Stan by competent ophiolite detailed field geology, petrography, geochemistry and geochronology of the comprehensive study, this paper argues clamping block in East Kunlun and the Hoh Xil - between the Bayan Har block Early Paleozoic of the original Te Site Animaqing - cloth Castle ocean basin may be formed in the late Neoproterozoic - Early Cambrian, Late Cambrian began northward subduction, in the Late Ordovician oceanic crust to stop the expansion, along with continued subduction role Animaqing - cloth Castle residual ocean basin into basin. Silurian period, the north and south of the Hoh Xil East Kunlun block - Bayan Har blocks collision, the former Tethys ocean basin closure.Degree Year: 2010
Stan effective in the East Kunlun ophiolite edge Animaqing - Castle Peak tectonic belt western cloth, separating the north and south of the eastern Kunlun orogenic belt Hoh Xil - Bayan Har orogenic belt. In this paper, cloth Castle Peak area ophiolite Stan effective for the study, through detailed field line survey, focus and profile measurement system for analysis of indoor microscopic thin, ophiolites Stan on effective field distribution, an extension of the direction, size Neodymium Magnets and occurrence and rock assemblages, petrographic features in detail. Meanwhile, representative samples of the rock geochemical and isotopic dating test test, from geochemical and isotope geochronology of the effective aspects of Stan ophiolite tectonic environment and age, to obtain an initial understanding of the following:
Effective direction of Stan ophiolite extends to the North West, parallel to the East Kunlun fault. Ophiolite rock assemblages within the more complete, the south side of the bottom of the mantle rocks are altered by the dark green harzburgite (serpentinite), lherzolite composition, was constructed with the contact between the rock; diabase porphyrite were interspersed with rock-like dikes in serpentinite, the rock pulse width of 0.5m ~ 6m; north appear dark gray massive gabbro, cumulates is not obvious, and was constructed south of serpentinite contact relationship; most The upper part of gray-black basalt alteration, local shows pillow structure, was constructed with the gabbro contact relationships; ophiolite overlying sedimentary rocks of the deep gray-black silty mudstone, and the fault contact between the basalt.
Effective combination of Stan ophiolite serpentinite range of SiO2 content smaller, low-Ti depleted magnesium-rich potassium and sodium; http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets gabbro and diabase porphyry belong to the sub-alkaline series, the diagrams are located in the ACM mafic accumulation of rocky; sub-alkaline basalts are tholeiitic basalt series. Effective Stein ophiolite meta-peridotite chondrite-normalized curves are open "U" shape, cumulate peridotite slightly depleted LREE flat type; gabbro, diabase and basalt porphyry chondrite-normalized REE curves are very similar, are LREE depleted. In primitive mantle-normalized trace element on the curve, effective Stan ophiolite rock units in the large ion lithophile elements fluctuates significantly, the high field strength elements are relatively flat, without Nb, Ta, Ti losses, indicating that almost no continental crust by mixing dye, no island arc and oceanic island rock characteristics, and effective ingredients are very similar to the normal basalt Stan-ocean ridge basalt. Geochemical analysis shows that more effective Stein ophiolite probably formed in the normal mid-ocean ridge tectonic environment.
Effective Stein ophiolite gabbro of LA-ICP-MS zircon U-Pb weighted average age of (516.4 ± 6.3) Ma, shows effective Stein ophiolite formed in the early Cambrian, suggesting that the East Kunlun edge Animaqing - cloth Castle Tethyan tectonic belt is not only the existence of ophiolite, there are early Paleozoic Proto-Tethys ophiolite.
Stan by competent ophiolite detailed field geology, petrography, geochemistry and geochronology of the comprehensive study, this paper argues clamping block in East Kunlun and the Hoh Xil - between the Bayan Har block Early Paleozoic of the original Te Site Animaqing - cloth Castle ocean basin may be formed in the late Neoproterozoic - Early Cambrian, Late Cambrian began northward subduction, in the Late Ordovician oceanic crust to stop the expansion, along with continued subduction role Animaqing - cloth Castle residual ocean basin into basin. Silurian period, the north and south of the Hoh Xil East Kunlun block - Bayan Har blocks collision, the former Tethys ocean basin closure.Degree Year: 2010
New permanent magnet synchronous motor control system design
Title: New permanent magnet synchronous motor control system design Author: Yu Jiaqi Degree-granting unit: Zhejiang University Keywords: permanent magnet synchronous motor;; microcontroller;; frequency control system Summary:
History of the development of human society, energy is always a material basis for human survival, scientific and technological progress and energy is the acquisition, transformation, use together. Because energy production, conversion efficiency, transmission distribution easy to use easy to control, thereby gaining the most widely used. Energy generation and use of more involved mechanical and electrical conversion between two forms of energy, motor (motors, generators) as Neodymium Magnets electromechanical energy conversion device location key, the motor technology is directly related to efficient energy conversion and use, energy development and conservation.
Motor control technology is the main service in the motor operation, characteristics of control, the most important is the speed control motor and generator excitation control. With the power electronics technology, microelectronic technology, computer control technology applications in motor control, motor control is based on electronic control as the main form, and gradually became one of the motor as the mechanical body, set of information technology, microelectronics technology and work machine in one of the mechanical and electrical integration technology, high-tech transformation is an important means of conventional electromechanical technology.
Permanent magnet synchronous motor in China's development has a unique advantage. Rare earth resources China is a big country, with nearly 80 percent of the world's rare earth reserves. Permanent magnet motor electromagnetic, heat and mechanical vibration design, has been Ansoft, Ansys and other supporting software, design standards are improving. Permanent magnet synchronous motor has become a general direction of the motor development in the industrial power, wind power generation and servo system has been widely used. Permanent magnet http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets synchronous motor control has become a research hotspot. World-famous motor control inverter manufacturers such as ABB, Yaskawa, Siemens also launched specific control of permanent magnet synchronous motor drive. You can see, reliable and efficient permanent magnet synchronous motor control system for the motor to make a huge contribution to the energy-saving projects.
According to actual application requirements, and a large torque, low speed permanent magnet synchronous motors for high-power disc as an application object. Disc permanent magnet synchronous motor as a permanent magnet synchronous motor structure, it is flat type air-gap, axial air-gap magnetic field is, therefore, also known as the axial magnetic field motor. At present, domestic and foreign has developed a number of different structural forms, mainly single stator and rotor, the middle rotor, stators and other intermediate species. The middle of the stator structure of the high-power disc permanent magnet synchronous motor has been used in many high torque, low speed electric drive systems, such as pumping equipment on the field.
This paper describes the high torque, low speed permanent magnet motor control system design, including hardware systems, micro-controller system and control strategy. Degree Year: 2010
History of the development of human society, energy is always a material basis for human survival, scientific and technological progress and energy is the acquisition, transformation, use together. Because energy production, conversion efficiency, transmission distribution easy to use easy to control, thereby gaining the most widely used. Energy generation and use of more involved mechanical and electrical conversion between two forms of energy, motor (motors, generators) as Neodymium Magnets electromechanical energy conversion device location key, the motor technology is directly related to efficient energy conversion and use, energy development and conservation.
Motor control technology is the main service in the motor operation, characteristics of control, the most important is the speed control motor and generator excitation control. With the power electronics technology, microelectronic technology, computer control technology applications in motor control, motor control is based on electronic control as the main form, and gradually became one of the motor as the mechanical body, set of information technology, microelectronics technology and work machine in one of the mechanical and electrical integration technology, high-tech transformation is an important means of conventional electromechanical technology.
Permanent magnet synchronous motor in China's development has a unique advantage. Rare earth resources China is a big country, with nearly 80 percent of the world's rare earth reserves. Permanent magnet motor electromagnetic, heat and mechanical vibration design, has been Ansoft, Ansys and other supporting software, design standards are improving. Permanent magnet synchronous motor has become a general direction of the motor development in the industrial power, wind power generation and servo system has been widely used. Permanent magnet http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets synchronous motor control has become a research hotspot. World-famous motor control inverter manufacturers such as ABB, Yaskawa, Siemens also launched specific control of permanent magnet synchronous motor drive. You can see, reliable and efficient permanent magnet synchronous motor control system for the motor to make a huge contribution to the energy-saving projects.
According to actual application requirements, and a large torque, low speed permanent magnet synchronous motors for high-power disc as an application object. Disc permanent magnet synchronous motor as a permanent magnet synchronous motor structure, it is flat type air-gap, axial air-gap magnetic field is, therefore, also known as the axial magnetic field motor. At present, domestic and foreign has developed a number of different structural forms, mainly single stator and rotor, the middle rotor, stators and other intermediate species. The middle of the stator structure of the high-power disc permanent magnet synchronous motor has been used in many high torque, low speed electric drive systems, such as pumping equipment on the field.
This paper describes the high torque, low speed permanent magnet motor control system design, including hardware systems, micro-controller system and control strategy. Degree Year: 2010
Inner Temple before Taipusiqi to rock geochemical characteristics and metallogenic prognosis
Title: Inner Temple before Taipusiqi to rock geochemical characteristics and metallogenic prognosis Author: Wu Cuihua Degree-granting units: Central South University Keywords: granite;; geochemistry;; metallogenic prognosis;; northern margin of the North China block;; Taipusiqi Summary:
Mine is located in the former temple in the northern margin of the North China block, is Proterozoic rift zone of copper and zinc cobalt-platinum-gold metallogenic belt in eastern Zhengxiangbaiqi - Toronto gold metal into a lead-zinc mine, its great potential for more and more ore valued by the majority of scholars. However, relatively little investment in geological work of its Neodymium Magnets exploration work in this area has not been a major breakthrough.
By detailed field geological survey, to collect a lot of geological information, collected a large number of rock and mineral samples and specimens, the use of petrology, structural geology, mineralogy, ore deposits, geochemistry, mineralization predictions, exploration and other multi-disciplinary knowledge , from the northern margin of North China block is to start regional geological features, in-depth study of the temple in the region before the formation, structure, and mineralization of magmatic rocks and their relationship, focusing on analysis of the granite features of this area. Summed up the area before the temple in prospecting potential, and predicted the exploration target.
Prior to analysis by comparing the temple to rock rock rock and Shagou characteristics and geochemical characteristics of granitoids in this area that the high silica (> 56%), calc-alkaline (σ is 0.98-1.57), quasi-aluminum (A / CNK close to 1.1) and granodiorite - tonalite granitoid rocks and K-feldspar, Na-rich lithology (Na2O than K2O) type Ⅰ intrusive rocks. The former is part of the temple to rock with like "S" type characteristics of granite, and more http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets alkaline, with a low index of differentiation characteristics ((DI <88)). Mg # index (0.20-0.33) and δEu (former temple to rock a weak negative anomaly to positive anomaly) indicate an initial magma derived from partial melting of lower crustal rocks directly, for the magnetite series granite, with a low total REE (40.39 × 10-6-46.91 × 10-6) and the severity of the REE fractionation is not obvious (ω (LaN) / ω (YbN) of 1.68-6.35) characteristics. This is the first to rock that is made before the temple of gold mineralization in this area rock, and the intrusion of the former temple to rock for the gold is providing a power source, that the mineralization in this area has excellent conditions.
In the background of the area's geological, geological conditions, alteration and mineralization of ore controlling factors on the basis of comprehensive analysis of the information presented four exploration target. Degree Year: 2010
Mine is located in the former temple in the northern margin of the North China block, is Proterozoic rift zone of copper and zinc cobalt-platinum-gold metallogenic belt in eastern Zhengxiangbaiqi - Toronto gold metal into a lead-zinc mine, its great potential for more and more ore valued by the majority of scholars. However, relatively little investment in geological work of its Neodymium Magnets exploration work in this area has not been a major breakthrough.
By detailed field geological survey, to collect a lot of geological information, collected a large number of rock and mineral samples and specimens, the use of petrology, structural geology, mineralogy, ore deposits, geochemistry, mineralization predictions, exploration and other multi-disciplinary knowledge , from the northern margin of North China block is to start regional geological features, in-depth study of the temple in the region before the formation, structure, and mineralization of magmatic rocks and their relationship, focusing on analysis of the granite features of this area. Summed up the area before the temple in prospecting potential, and predicted the exploration target.
Prior to analysis by comparing the temple to rock rock rock and Shagou characteristics and geochemical characteristics of granitoids in this area that the high silica (> 56%), calc-alkaline (σ is 0.98-1.57), quasi-aluminum (A / CNK close to 1.1) and granodiorite - tonalite granitoid rocks and K-feldspar, Na-rich lithology (Na2O than K2O) type Ⅰ intrusive rocks. The former is part of the temple to rock with like "S" type characteristics of granite, and more http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets alkaline, with a low index of differentiation characteristics ((DI <88)). Mg # index (0.20-0.33) and δEu (former temple to rock a weak negative anomaly to positive anomaly) indicate an initial magma derived from partial melting of lower crustal rocks directly, for the magnetite series granite, with a low total REE (40.39 × 10-6-46.91 × 10-6) and the severity of the REE fractionation is not obvious (ω (LaN) / ω (YbN) of 1.68-6.35) characteristics. This is the first to rock that is made before the temple of gold mineralization in this area rock, and the intrusion of the former temple to rock for the gold is providing a power source, that the mineralization in this area has excellent conditions.
In the background of the area's geological, geological conditions, alteration and mineralization of ore controlling factors on the basis of comprehensive analysis of the information presented four exploration target. Degree Year: 2010
Nano-based solid electrolyte CeO_2 Preparation and Properties
Title: Nano-based solid electrolyte CeO_2 Preparation and Properties Author: Lin Nan Degree-granting unit: Heilongjiang University Keywords: mixed alkali-mediated method;; CeO_2;; nano electrolyte;; conductivity Summary: Solid oxide fuel cell (SOFC) is recognized as the 21st century, a clean, pollution-free, efficient energy systems, including solid oxide electrolyte (oxygen ion conductor) is an important core component. Because of CeO2-based solid electrolyte ZrO2-based solid electrolyte higher than the ionic conductivity and a potential intermediate temperature solid electrolyte material. However, CeO2-based electrolyte materials, there are still some shortcomings, limiting their practical goods. For example: CeO2-based electrolyte material preparation process complex; high-quality ceramics sintered at higher temperatures. In addition, CeO2-based electrolyte materials in oxygen ion Neodymium Magnets conductivity in the lower temperature zone. There is an urgent need to develop easy processing, the temperature zone has good electrical properties of CeO2-based electrolyte materials. This thesis research focused on the following aspects: In this paper a mixed alkali-mediated method (CHM) prepared Ce1-xLnxO2-δ (Ln = Pr, Nd, Sm, Gd) (x = 0.05-0.25) nano-electrolyte materials. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other tests carried out by means of sample characterization. XRD patterns prove that the product is derived from cubic fluorite structure. TEM images show Ce1-x (Nd / Pr) xO2-δ sample for nanoparticles, Ce1-x (Sm / Gd) xO2-δ nano-particles. Sintering temperature of 1350-1400 ℃, the relative density of 80%. Electrochemical impedance spectroscopy (EIS) on the electrochemical properties of the material tested. The results show that Ce0.80Nd0.20O2-δ in the temperature region with high conductivity, 800 ℃ air atmosphere, the conductivity reached 4.1 × 10-2 S cm-1, conductivity activation energy is 0.83 eV. To further enhance the Ce1-xLnxO2-δ (Ln = Pr, Nd) electrolyte material density and electrical properties, we use the same synthetic route to http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets prepare a series of rare earth - transition metal-doped of Ce1-x-yLnxCoyO2-δ (Ln = Pr, Nd) nano-electrolyte material, and the characteristics of the synthesized product, a systematic study of nature. The synthesis of Ce1-x-yPrxCoyO2-δ and Ce1-x-yNdxCoyO2-δ samples for the nanorods and nanoparticles. 1400 ℃ Relative density of sintered samples up to 90%. At 800 ℃, Ce0.78Nd0.2Co0.02O2-δ of the conductivity of 0.10S cm-1. Rare earth - transition metal-doped nano-CeO2-based electrolyte than the rare-earth single-doped CeO2-based electrolyte materials with higher ionic conductivity and low conductivity activation energy. Degree Year: 2010
2011年12月25日星期日
New rare earth terbium complex synthesis and application of fluorescent probes
Title: New rare earth terbium complex synthesis and application of fluorescent probes
Author: Chen Jin snow
Degree-granting unit: Dalian University of Technology
Key words: terbium complex;; fluorescent probe;; time-resolved fluorescence analysis;; biological imaging
Summary:
Long-life fluorescent probes based on rare-earth fluorescence properties of the developed high-sensitivity chemical and biological analysis of time-resolved fluorescence detection technology has been in clinical and biological technologies have been widely used. In this paper the study, design, synthesis and characterization of three respectively for the detection of Zn2, Magnetic lifter hydroxyl radical (-OH), H_2O_2 the terbium complex fluorescent probe; N, N, N1, N1-{2, 6-- bis (3'-aminopropyl-methyl-1 '- pyrazolate) -4 - [N, N-bis (2 - pyridylmethyl) aminomethyl pyridine]} tetra-acetic acid-Tb3 (BBATA-Tb3), N, N, N1, N1-[2,6 - bis (3'-aminopropyl-methyl-1 '- pyrazol-yl) -4 - (4'-aminophenoxy) methyl pyridine] tetra-acetic acid-Tb3 (BMPTA-Tb3) and N, N, N1, N1-[2,6 - bis (3'-aminopropyl-methyl-1 '- pyrazol-yl) -4 - (3', 4'-aminophenoxy ) methyl pyridine] tetra-acetic acid-Tb3 (BMTA-Tb3). Using NMR, elemental analysis and mass spectrometry by means of synthetic intermediates and final products were characterized by the establishment of terbium complexes based on the detection of Zn2, · OH, H202 of the time-resolved fluorescence measurement techniques and time-resolved fluorescence imaging technique.
Three kinds of fluorescent probe itself is very weak, when the target substance detecting fluorescence quantum yield of reaction was significantly enhanced, as strong fluorescent complexes in aqueous solution can be achieved Zn2, · OH, H202 high-sensitivity detection. Which, BMTA-Tb3 detection of H2O2 in the horseradish peroxidase (HRP)-catalyzed achieve. http://www.999magnet.com/products/131-magnetic-lifter Probes with long fluorescence lifetime, good water solubility, good stability, high sensitivity, suitable for use under physiological conditions. After the probe is esterified through thin 'membrane into the cell, combined with time-resolved fluorescence microscopy imaging techniques, can effectively eliminate the short-lived background fluorescence from the scattered light and interference to achieve a living HeLa cells Zn2, · OH, H202 determination. Established a target in living cells highly sensitive detection method.
Degree Year: 2010
Author: Chen Jin snow
Degree-granting unit: Dalian University of Technology
Key words: terbium complex;; fluorescent probe;; time-resolved fluorescence analysis;; biological imaging
Summary:
Long-life fluorescent probes based on rare-earth fluorescence properties of the developed high-sensitivity chemical and biological analysis of time-resolved fluorescence detection technology has been in clinical and biological technologies have been widely used. In this paper the study, design, synthesis and characterization of three respectively for the detection of Zn2, Magnetic lifter hydroxyl radical (-OH), H_2O_2 the terbium complex fluorescent probe; N, N, N1, N1-{2, 6-- bis (3'-aminopropyl-methyl-1 '- pyrazolate) -4 - [N, N-bis (2 - pyridylmethyl) aminomethyl pyridine]} tetra-acetic acid-Tb3 (BBATA-Tb3), N, N, N1, N1-[2,6 - bis (3'-aminopropyl-methyl-1 '- pyrazol-yl) -4 - (4'-aminophenoxy) methyl pyridine] tetra-acetic acid-Tb3 (BMPTA-Tb3) and N, N, N1, N1-[2,6 - bis (3'-aminopropyl-methyl-1 '- pyrazol-yl) -4 - (3', 4'-aminophenoxy ) methyl pyridine] tetra-acetic acid-Tb3 (BMTA-Tb3). Using NMR, elemental analysis and mass spectrometry by means of synthetic intermediates and final products were characterized by the establishment of terbium complexes based on the detection of Zn2, · OH, H202 of the time-resolved fluorescence measurement techniques and time-resolved fluorescence imaging technique.
Three kinds of fluorescent probe itself is very weak, when the target substance detecting fluorescence quantum yield of reaction was significantly enhanced, as strong fluorescent complexes in aqueous solution can be achieved Zn2, · OH, H202 high-sensitivity detection. Which, BMTA-Tb3 detection of H2O2 in the horseradish peroxidase (HRP)-catalyzed achieve. http://www.999magnet.com/products/131-magnetic-lifter Probes with long fluorescence lifetime, good water solubility, good stability, high sensitivity, suitable for use under physiological conditions. After the probe is esterified through thin 'membrane into the cell, combined with time-resolved fluorescence microscopy imaging techniques, can effectively eliminate the short-lived background fluorescence from the scattered light and interference to achieve a living HeLa cells Zn2, · OH, H202 determination. Established a target in living cells highly sensitive detection method.
Degree Year: 2010
Preparation of a new terbium complex and time-resolved fluorescence imaging measurement
Title: Preparation of a new terbium complex and time-resolved fluorescence imaging measurement Author: Fu Xiaoyan Degree-granting unit: Dalian University of Technology Key words: terbium complex;; biomarkers;; time-resolved fluorescence biological imaging;; biochemical Summary: Based on long-lived fluorescence rare earth complexes developed characteristics of high-sensitivity time-resolved fluorescence analysis of biochemical and clinical testing technology has been in the field of biotechnology has been widely used, but the ideal of the existing number of rare earth complexes is very limited, severely limited the time Biochemical analysis resolved fluorescence technology. The design work, preparation and characterization of two new Tb (Ⅲ) fluorescent complexes, and to explore its biological markers and determination of time-resolved fluorescence imaging applications. Design synthesis of a carboxylic acid structure Magnetic lifter containing 5 Tb (Ⅲ) fluorescent complexes: N, N, N1, N1-[2,6 - bis (3'-aminomethyl-1 'pyrazolate) -4 - carboxy-pyridine] tetracarboxylic acid Tb (Ⅲ) (referred to as the BCTA-Tb3 +), examined the BCTA and the formation of complexes with terbium fluorescence properties, BCTA-Tb3 + fluorescence quantum yield of 8.8%, the fluorescence lifetime of 2.67 ms, while of pH fluorescence intensity and fluorescence lifetime of its effects, determine the BCTA-Tb3 + for time-resolved fluorescence measurement of the minimum detection limit of 3.64 × 10-13mol / L, show that the new terbium complexes in high sensitivity time-resolved Biochemical analysis of the fluorescence has a good prospect. Synthesis of a new type containing aldehyde methyl group Tb (Ⅲ) fluorescent complexes: N, N, N1, N1-[2,6 - bis (3'-aminopropyl-methyl-1 '- pyrazolate) -4 - aldehyde pyridine] tetracarboxylic acid Tb (Ⅲ) (referred to as BCPTA-Tb3 +), and the use of nuclear magnetic resonance spectroscopy, elemental analysis and its intermediates on BCPTA structure was characterized, from the rare earth fluorescent complexes with BCPTA luminescence mechanism triplet energy level of the experimental results discussed BCPTA-Tb3 + luminescence reason, the complex is not only a high fluorescence intensity, fluorescence lifetime long, good water solubility, etc., but also very easy to tag biological molecules with the active aldehyde groups that The new terbium complex as a very fast and efficient application of marker value. Use of BCTA-Tb3 +, BCPTA-Tb3 + as http://www.999magnet.com/products/131-magnetic-lifter a fluorescence probe labeled streptavidin avidin, respectively, for the determination of time-resolved fluorescence imaging analysis of pathogenic micro-organisms Giardia lamblia and Cryptosporidium Cryptosporidium parvum, time-resolved fluorescence immunoassay analysis showed that the use of time-resolved Fluorescence microscopy analysis, samples can be completely eliminated in the complex background of strong fluorescence interference, to achieve the ultra-complex samples Giardia lamblia and Cryptosporidium Cryptosporidium parvum high sensitivity, high specificity of detection. Degree Year: 2010
A, B co-doped rare-earth manganese oxides bit Hydrothermal Synthesis and Characterization
Title: A, B co-doped rare-earth manganese oxides bit Hydrothermal Synthesis and Characterization
Author: Yang Meiqi
Degree-granting units: Jilin University
Keywords: doped perovskite oxides;; double perovskite oxides;; hydrothermal synthesis;; magnetic
Summary:
This paper studies the hydrothermal system under A, B bit of doped perovskite-type manganese oxide synthesis. Parent compound of lanthanum manganese for the A and B sites Ca ions doped Fe ions series of compounds were synthesized by hydrothermal reaction conditions were systematically explored, confirmed the structure of the product composition. First Magnetic lifter synthesized under hydrothermal conditions in the B-bit double-perovskite-type Fe-doped rare-earth manganese oxide, synthetic methods and reaction conditions for a detailed description.
Introduction In the first chapter, we introduced the structure of perovskite oxides of manganese-based composite basic knowledge and basic theory of doped perovskite and double perovskite study summarizes the current situation; in the second chapter experimental section, we introduce the synthesis under hydrothermal conditions in the La-Ca-Mn-Fe-O series of compounds of the reaction conditions for the realization of the A and B site ions controllable modulation, and a preliminary discussion as doping caused by structural, magnetic and other changes in the nature http://www.999magnet.com/products/131-magnetic-lifter of the situation; experiments in the third chapter, we first obtained by hydrothermal method of double perovskite compounds Ln2FeMnO6 (Ln = Gd, Tb, Dy, Ho) series of samples, and its composition, structure and crystal morphology are described.
Degree Year: 2010
Author: Yang Meiqi
Degree-granting units: Jilin University
Keywords: doped perovskite oxides;; double perovskite oxides;; hydrothermal synthesis;; magnetic
Summary:
This paper studies the hydrothermal system under A, B bit of doped perovskite-type manganese oxide synthesis. Parent compound of lanthanum manganese for the A and B sites Ca ions doped Fe ions series of compounds were synthesized by hydrothermal reaction conditions were systematically explored, confirmed the structure of the product composition. First Magnetic lifter synthesized under hydrothermal conditions in the B-bit double-perovskite-type Fe-doped rare-earth manganese oxide, synthetic methods and reaction conditions for a detailed description.
Introduction In the first chapter, we introduced the structure of perovskite oxides of manganese-based composite basic knowledge and basic theory of doped perovskite and double perovskite study summarizes the current situation; in the second chapter experimental section, we introduce the synthesis under hydrothermal conditions in the La-Ca-Mn-Fe-O series of compounds of the reaction conditions for the realization of the A and B site ions controllable modulation, and a preliminary discussion as doping caused by structural, magnetic and other changes in the nature http://www.999magnet.com/products/131-magnetic-lifter of the situation; experiments in the third chapter, we first obtained by hydrothermal method of double perovskite compounds Ln2FeMnO6 (Ln = Gd, Tb, Dy, Ho) series of samples, and its composition, structure and crystal morphology are described.
Degree Year: 2010
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