Dielectric and varistor properties of rare-earth-doped ZnO and CaCu_(3)Ti_(4)O_(12) composite ceramics  

作　　者：Huafei Lu Yuanhua Lin Jiancong Yuan Cewen Nan Kexin Chen 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,P.R.China

出　　处：《Journal of Advanced Dielectrics》2013年第1期19-22,共4页先进电介质学报（英文）

基　　金：supported by the Ministry of Science and Technology of China through a 973-Project under Grant No.2009CB623303;NSF of China(50737001,50972068);NSF of Beijing 2092016;Scientific Research Project of Tsinghua University No.2009THZ08063.

摘　　要：To investigate the multi-functional ceramics with both high permitivity and large nonlinear cofficient,we have prepared rare-earth Tb-and-Co doped ZnO and TO_(2)rich CaCu_(3)Ti_(4)O_(12)(TCCTO)powders by chemical co-precipitation and sol-gel methods re-spectively,and then obtained the TCCTO/ZnO composite ceramics,sintered at 1100℃for 3h in air.Analyzing the composite ceramics of the microstructure and phase composition indicated that the composite ceramics were composed of the main phases of ZnO and CaCu_(3)Ti_(4)O_(12)(CCTO).Our results revealed that the TCCTO/ZnO composite ceramics showed both high dielectric and good nonlinear electrical behaviors.The composite ceramic of TCCTO:ZnO=0.3 exhibited a high dielectric constant of~210(1 kHz)with a nonlinear cofficient of~11.The dielectric behavior of TCCTO/ZnO composite could be explained by the mixture rule.With the high dielectric permittivity and tunable varistor behaviors,the composite ceramics has a potential application for the higher voltage transportation devices.

关 键 词：VARISTORS CCTO nonlinear coefficient dielectrics 

分 类 号：TQ1[化学工程]