K_2O-SnO_2-LiZnVO_4系湿敏陶瓷电性能的复阻抗分析  

Complex impedance analysis for electric properties on humidity ceramic of K_2O-SnO_2-LiZnVO_4

作　　者：胡素梅[1] 陈海波[1] 傅刚[2] 

机构地区：[1]茂名学院技术物理系,广东茂名525000 [2]广州大学物理系,广东广州510405

出　　处：《传感器与微系统》2007年第2期50-52,共3页Transducer and Microsystem Technologies

摘　　要：采用共沉淀法制备出K2O-SnO2-L iZnVO4系湿敏陶瓷材料,考察了液相掺杂K+对材料湿敏特性的影响,通过复阻抗分析方法,研究了材料的电性能,并进一步分析了试样在不同湿度中的导电机理和等效电路。结果表明:K+液相掺杂的摩尔分数为10%时可使材料具有低湿电阻小,灵敏度适中的特性。复阻抗分析表明:试样的电容在低频范围随相对湿度的升高而增大,但高频范围几乎不随相对湿度变化,且试样在低湿时主要以电子导电为主,高湿时以离子导电为主。K2O-SnO2-LiZnVO4 system humidity-sensitive ceramics are prepared by co-precipitation. The influence of the liquid-doped K^＋ on the humidity-sensitive characteristics is studied. The electric properties, conductance mechanism and equivalent circuit are studied by complex impedance analysis. The experimental results show that a humidity-sensitive material with 10 % liquid-doped K^＋ is character of lower resistance at lower humidity and proper humidity sensitivity. Complex impedance analysis indicates that the capacitance of the Sensor increases with relative hymidity （RH） up in especially for low measurement frequency. The material conductance is mainly electronics at low RH and ion at high RH.

关 键 词：湿敏陶瓷 K^+液相掺杂 复阻抗分析 导电机理 

分 类 号：TN304[电子电信—物理电子学]