氧离子导体La2Mo1.9Sc0.1O9的合成及电性能研究  

Synthesis and Electrical Properties of Oxide-Ion Conductor La_2Mo_(1.9)Sc_(0.1)O_9

作　　者：李亚东[1] 刘进伟[1] 王小稳[1] 尹金玲[1] 徐建红[1] 马桂林[1] 

机构地区：[1]苏州大学材料与化学化工学部,江苏省有机合成重点实验室,苏州215123

出　　处：《无机化学学报》2010年第6期1066-1070,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20771079)

摘　　要：采用固相法首次合成了氧离子导体La2Mo1.9Sc0.1O9陶瓷样品,进行了XRD、SEM表征,用交流阻抗谱、氧浓差电池等电化学方法研究了样品在450～850℃下的离子导电性。结果表明,该陶瓷样品具有立方相La2Mo2O9结构,掺杂5%的Sc3+能有效地抑制La2Mo2O9在大约580℃时的相变;在氧化性气氛中是纯的氧离子导体,而在还原性气氛中为氧离子与电子的混合导体,850℃时的氧离子电导率为0.04S·cm-1。Ceramic sample of La2Mo1.9Sc0.1O9 was synthesized via a conventional high-temperature solid-state reaction for the first time and characterized by XRD and SEM. The ionic conduction in the samples was investigated by AC impedance spectra, oxygen concentration cell at 450～850 ℃. The ceramic sample has a cubic phase structure of La2Mo2O9, indicating that Sc doping content of 5% in Mo-sites could effectively suppress the phase transition around 580 ℃. In oxidizing atmosphere, the sample was a pure oxide ionic conductor, whereas in reducing atmosphere was a mixed oxide ionic and electronic conductor. An oxide-ionic conductivity of 0.04 S· cm-1 was observed at 850 ℃.

关 键 词：La2Mo2O9 La2Mo1.9Sc0.1O9 氧离子导体 氧浓差电池 电导率 

分 类 号：O614.331[理学—无机化学] O614.612[理学—化学]