用复阻抗法分析MgCr-2O_4-TiO_2湿敏陶瓷感湿机理  

AC Complex Impedance Analysis of MgCr_2O_4-TiO_2 Ceramic Humidity Sensor

作　　者：卢跃东 张靖漓[2] 李标荣[2] 曾勇强[2] 

机构地区：[1]东莞市电子工业总公司 [2]华中理工大学固体电子学系

出　　处：《传感技术学报》1993年第3期36-39,共4页Chinese Journal of Sensors and Actuators

摘　　要：本文研究了不同湿度条件下MgCr_2O_4-TiO_2的复阻抗平面图及其对应的等效电路图.根据介质极化理论,分析了不同湿度范围内的极化机制,得出结论:相对湿度大于25%RH时,主要是质子(H_3O)^+的电导起作用;相对湿度小于33%RH时,主要是电子电导起作用;两者之间是质子和电子共同起作用.AC complex impedance analysis of MgCr2O4 Ceramics has been investigated in this paper. From complex impedance plots under different relative humidity, an equivalent circuit model of MgCr2O4-TiO2 ceramics is obtained. According to polarization theory, three regions can be distinguished from the analysis of the conduction mechanism of MgCr2O4-TiO2 ceramics. Ion and electron conduction are dominant when relative humidity is above 75%RH and below 33%RH respectively. Between the two points, electron and ion conduction make mutual contribution to the electrical conduction of MgCr2O4-TiO2 ceramics sensor.

关 键 词：MgCr2Or-TiO2 湿敏陶瓷 复阻抗 

分 类 号：TN304.82[电子电信—物理电子学]