上海交通大学学报

上海交通大学学报（自然版）

• 一般工业技术 • 上一篇    下一篇

CaCu3Ti4O12和La2/3Cu3Ti4O12陶瓷的电导特性

周小莉   

  1. （台州学院 物理与电子工程学院， 浙江 台州 318000）
  • 收稿日期:2009-05-10 修回日期:1900-01-01 出版日期:2010-05-31 发布日期:2010-05-31

Conductance of Like Perovskite Structure ACu3Ti4O12 Materials

ZHOU Xiaoli   

  1. (School of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, Zhejiang, China)
  • Received:2009-05-10 Revised:1900-01-01 Online:2010-05-31 Published:2010-05-31

摘要： 采用固相反应法制备CaCu3Ti4O12和La2/3Cu3Ti4O12陶瓷材料并研究了其电导特性.结果表明，CaCu3Ti4O12和La2/3Cu3Ti4O12的电导率随温度的变化规律相似.在低温（<150 K ) 区域，CaCu3Ti4O12的电导率随温度升高而增大，即呈负阻温特性；在150~170 K温度区域，电导率出现极大值，且其电导率极大值为La2/3Cu3Ti4O12的近4倍；在较高的温度（170~250 K ）区域，电导率随温度的升高而减小.这是由于Ca2＋被La3＋替代后在该位置留下1/3空位而使La2/3Cu3Ti4O12的激活能高达1.01 eV 的缘故.

关键词: 类钙钛矿, 电导率, 激活能

Abstract: CaCu3Ti4O12 and La2/3Cu3Ti4O12 materials were prepared by solid reaction process, and the conductance properties were measured and studied. The experimental data show that the conductancetemperature curves of CaCu3Ti4O12 and La2/3Cu3Ti4O12 are similar. In the lower temperature range (<150 K), the conductance increases with the temperature and the samples exhibit negative resistancetemperature properties. In the temperature range of 150－170 K, the conductance reaches its maximum. Then, in the higher temperature range (170－250 K), the conductance decreases with the temperature. But the maximum value of conductance of CaCu3Ti4O12 is about 3 times larger than that of La2/3Cu3Ti4O12. Further analysis shows that after Ca 2＋ is replaced by La 3＋, onethird of vacancies remain in A sites, which results in the activation energy of La2/3Cu3Ti4O12 reaching 1.01 eV. The higher activation energy is the main cause of lower conductance of La2/3Cu3Ti4O12.

中图分类号: