Comparative characteristics of yttrium oxide and yttrium nitric acid doping in ZnO varistor ceramics

作     者：徐东 唐冬梅 焦雷 袁宏明 赵国平 程晓农 

作者机构：School of Materials Science and EngineeringJiangsu University Key Laboratory of Semiconductor Materials ScienceInstitute of SemiconductorsChinese Academy of Sciences State Key Laboratory of Electrical Insulation and Power Equipment(Xi'an Jiaotong University) Changzhou Engineering Research InstituteJiangsu University State Key Laboratory of Inorganic Synthesis and Preparative Chemistry(Jilin University) College of ChemistryJilin University 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2012年第19卷第8期

页      面：2094-2100页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project(BK2011243) supported by the Natural Science Foundation of Jiangsu Province, China Project(EIPE11204) supported by the State Key Laboratory of Electrical Insulation and Power Equipment, China Project(KF201104) supported by the State Key Laboratory of New Ceramic and Fine Processing, China Project(KFJJ201105) supported by the Opening Program of State key Laboratory of Electronic Thin Films and Integrated Devices, China Project(2011-22) supported by the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry of Jilin University, China Project(10KJD430002) supported by the Universities Natural Science Research Project of Jiangsu Province, China Project(11JDG084) supported by the Research Foundation of Jiangsu University, China 

主　　题：ceramics varistor rare earth microstructure electrical properties 

摘      要：The effect of different molar ratios of Y2O3 and Y（NO3）3 on the microstructure and electrical response of ZnO-Bi203-based varistor ceramics sintered at 1 000 ℃ was investigated, and the mechanism by which this doping improves the electrical characteristics of ZnO-Bi203-based varistor ceramics was discussed. With increasing amounts of Y（NO3）3 or Y2O3 in the starting composition, Y2O3, Sb204 and Y-containing Bi-rich phase form, and the average grain size significantly decreases. The average grain size significantly decreases as the contents of rare earth compounds of Y（NO3）3 or Y2O3 increase. The maximum value of the nonlinear coefficient is found at 0.16% Y（NO3）3 or 0.02% YaO3 （molar fraction） doped varistor ceramics, and there is an increase of 122% or 35% compared with the varistor ceramics without Y（NO3）3 or Y2O3. The threshold voltage VT of Y（NO3）3 and Y2O3 reaches at 1 460 V/mm and 1 035 V/ram, respectively. The results also show that varistor sample doped with Y（NO3）3 has a remarkably more homogeneous and denser microstructure in comparison to the sample doped with Y2O3.