上海交通大学学报(自然版)

• 电工技术 • 上一篇    下一篇

LiCoO2陶 瓷 的 力 学 谱 和 电 导 特 性

欧阳红群,刘文峰,桑茂,陈岚,朱可,熊小敏   

  1. (中山大学 物理科学与工程技术学院, 广州 510275)
  • 收稿日期:2009-03-01 修回日期:1900-01-01 出版日期:2010-05-31 发布日期:2010-05-31

Characteristic of Mechanical Spectra and Electronic Transport Property of LiCoO2 Ceramic

OU YANG Hongqun,LIU Wenfeng,SANG Mao,CHEN Lan,ZHU Ke,XIONG Xiaomin   

  1. (School of Physics and Engineering, Sun YatSen University, Guangzhou 510275, China)
  • Received:2009-03-01 Revised:1900-01-01 Online:2010-05-31 Published:2010-05-31

摘要: 摘要: 以Li2CO3Co3O4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.

关键词: 钴酸锂, 内耗, 相变, 电导率

Abstract: LiCoO2 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 .

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