La_2Mo_(2-x)W_xO_9的氧离子扩散和相变机制研究  

Study on Oxygen-ion Diffusion and Phase Transition of La_2Mo_(2-x)W_xO_9

作　　者：李丹[1] 李相虎[1] 方前锋[2] 

机构地区：[1]武汉工业学院数理系,武汉430023 [2]中国科学院固体物理研究所材料物理重点实验室,合肥230031

出　　处：《材料导报》2009年第20期58-61,共4页Materials Reports

基　　金：国家自然科学基金(50672100);湖北省教育厅科学研究计划项目(Q20091802)

摘　　要：采用介电弛豫和内耗技术,并结合XRD技术研究了新型氧离子导体La2Mo2-xWxO9(x=0、0.25、0.5、0.75、1.0、1.2、1.4)的氧离子扩散行为和相变机制。结果表明,在La2Mo2-xWxO9的介电损耗-温度谱和内耗-温度谱上均出现了2个损耗峰,其中低温峰对应氧离子的扩散弛豫过程,高温峰对应氧离子/空位分布的静态无序态到动态无序态的转变。The effects of tungsten doping on the oxygen-ion diffusion and the phase transition in La2Mo2-xWxO9 samples（x=0, 0.25, 0.5, 0.75, 1.0, 1.2, 1.4） are studied using dielectric relaxation, internal friction and the XRD measurements. The results show that two peaks are detected in the dielectric loss-temperature spectra and the internal friction-temperature spectra of La2Mo2-xWxO9 samples. The low-temperature relaxation peak is associated with oxygen ion diffusion, and the high-temperature peak is associated with a phase transition from static disordered state to dynamic disordered state of oxygen ion/vacancy distribution.

关 键 词：氧离子导体 介电弛豫 内耗 相变 

分 类 号：TM911[电气工程—电力电子与电力传动]