La_(1-x)Sr_xFeO_3系电子陶瓷的湿敏特性的研究  

Humidity Sensitive Properties of La_(1-x)Sr_xFeO_3 Electronic Ceramics

作　　者：张靖漓[1] 卢跃东[1] 吴国标 李标荣[1] 

机构地区：[1]华中理工大学固体电子学系

出　　处：《无机材料学报》1992年第1期37-41,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金 68901003

摘　　要：本工作用固相反应法,合成了 La_(1-x)Sr_xFeO_3(0≤x≤0.7)系电子陶瓷,考察了配方对其湿敏性能的影响,用阻抗分析仪测试了材料的介电谱和复阻抗谱,用非德拜模型对其电特性进行了分析讨论,并推导了等效电路的有关参量。结果表明,La_(1-x)Sr_xFeO_3是一种 n 型半导瓷,LaFeO_3具有负湿阻特性,而 La_(1-x)Sr_xFeO_3(0.1≤x≤0.4)却具有正湿阻特性,且其感湿灵敏度随 Sr 取代量的增加而增大。By using solid phase reaction method,perovskite-type La_(1-x)Sr_xFe_3(0≤x≤0.7)electronic ceramics were synthesized in oxygen atmosphere.Their resistance vs relativehumidity(R.H.)characteristics as well as dielectric and complex impedance spectrawere investigated.The experimental results were analyzed and discussed by non-De-bye model,and the equivalent circuit parameters were calculated.The results indi-cate that La_(1-x)Sr_xFeO_3 is a kind of n-type semiconducting ceramics,the resistanceof LaFeO_3 decreases with the increase of R.H.,on the other hand,the resistanceof La_(1-x)Sr_xFeO_3(0.1≤x≤0.3)increases with the increase of R.H.,and the humi-dity sensitivity increases with the increase of x value.

关 键 词：湿度 电性能 铁酸锶镧 电子陶瓷 

分 类 号：TQ174.756[化学工程—陶瓷工业]