LiCoO_2陶瓷的力学谱和电导特性  

Characteristic of Mechanical Spectra and Electronic Transport Property of LiCoO_2 Ceramic

作　　者：欧阳红群[1] 刘文峰[1] 桑茂[1] 陈岚[1] 朱可[1] 熊小敏[1] 

机构地区：[1]中山大学物理科学与工程技术学院,广州510275

出　　处：《上海交通大学学报》2010年第5期679-682,共4页Journal of Shanghai Jiaotong University

摘　　要：以Li2CO3、Co3O4和C2H5OH为原料,用固相反应法制备LiCoO2陶瓷,利用动态力学分析仪分析其在123-573 K时内耗与温度的关系,并利用四端法结合低温测试装置测量150-320 K范围内的LiCoO2陶瓷电导率.结果表明,LiCoO2陶瓷在170 K附近出现一个相变内耗峰,且其电导率随温度升高而明显增大.这是由于LiCoO2陶瓷在170 K附近产生了相变并使热激发的电导性质发生变化,从而使其激活能成倍增加.LiCoO_2 ceramics were synthesized by solid state reaction.An internal friction peak of phase transition type was observed around 170 K for LiCoO2 ceramics via dynamic mechanical analysis（DMA） in the temperature range of 123-573 K,which corresponds to the turning point in the plot of the logarithm of conductivity versus the inverse of temperature（ln σ-1/T）.It shows that the phase transition at 170 K could change the electronic transport property and the activation energy doubles in the high temperature portion in LiCoO2.

关 键 词：钴酸锂 内耗 相变 电导率 

分 类 号：TM912.9[电气工程—电力电子与电力传动] O482.1[理学—固体物理]