La_2O_3基导电陶瓷高温电阻率的测试和研究

MEASUREMENT AND STUDY OF RESISTIVITY OF CONDUCTIVE CERAMICS BASED ON La 2O 3 AT HIGH TEMPERATURE

研究了不同组成的Ｌａ２Ｏ３基导电陶瓷的高温电阻率，结果表明：（Ｌａ２Ｏ３）１－ａ·（Ｘ２Ｏ５）ａ·ＣｕＯ及（Ｌａ２Ｏ３）１－２ａ·（Ｘ２Ｏ５）２ａ·ＣｕＯ具有较低的高温电阻率。由于兼有金属导电机制和半导体导电机制，且两种导电机制随温度变化的作用相反。

The resistivities at high temperature were studied of conductive ceramics based on La 2O 3 with different compositions. The results showed that those of (La 2O 3) 1- a ·(X 2O 5) a ·CuO and (La 2O 3) 1-2 a ·(X 2O 5) 2 a ·CuO are relatively low. The resistivity change is very small between room temperature and 1 000 ℃ because the samples possess conductive mechanisms of both metal and semi conductor, and these two kinds of mechanisms act contrary with the change of temperature.