SrTiO_3双功能陶瓷的表面效应  

The Surface Effect of SrTiO3 Multifunction Ceramics

作　　者：李建英[1,2] 庄严[1,2] 李盛涛[1,2] 屠德民 

机构地区：[1]西安交通大学绝缘研究所 [2]信息产业部第七研究所

出　　处：《功能材料》1999年第4期399-401,共3页Journal of Functional Materials

摘　　要：通过压制、烧成不同厚度的瓷片，发现在一定的配方和工艺条件下，ＳｒＴｉＯ３双功能陶瓷的压敏电压Ｕ１０ｍＡ与瓷片厚度无关。对瓷片进行单向磨薄后测量表观电阻率，发现ＳｒＴｉＯ３双功能陶瓷存在着表面效应。对本文试样，表面存在厚度小于２０μｍ、电阻率大于１０６Ω·ｃｍ的高阻层，内部是电阻率小于１０Ω·ｃｍ的低电阻体。表面效应是导致ＳｒＴｉＯ３双功能陶瓷与ＺｎＯ压敏陶瓷导电行为不同的根本原因之一。Under certain conditions,it was found that the varistor voltage of SrTiO3 multifunction ceramics was independent on the thickness of specimens.The resistivity of specimens was measured after one-directional thinned gradually.It was found that the surface layer was high-resistive and the inner part was low-resistive.The surface effect was caused by the diffusion of oxygen to the sample when heat-treated in air.

关 键 词：双功能陶瓷 表面效应 钛酸锶 

分 类 号：TN304.82[电子电信—物理电子学]