Effects of Eu_2O_3 doping on microstructural and electronic properties of ZnO Bi_2O_3-based varistor ceramics prepared by high-energy ball milling  

作　　者：董玉娟 崔凤单 焦雷 徐红星 唐冬梅 吴婕婷 于仁红 徐东 

机构地区：[1]Faculty of Science,Jiangsu University [2]School of Material Science and Engineering,Jiangsu University [3]State key Laboratory of Electronic Thin Films and Integrated Devices (University of Electronic Science and Technology of China) [4]Changzhou Engineering Research Institute of Jiangsu University [5]Changzhou Ming Errui Ceramics Co.,Ltd.

出　　处：《Journal of Central South University》2013年第11期2947-2953,共7页中南大学学报（英文版）

基　　金：Projects(BK2011243,BK2012156) supported by the Natural Science Foundation of Jiangsu Province,China;Project(20123227120021) supported by the Specialized Research Fund for the Doctoral Program of Higher Education,China;Project(KFJJ201105) supported by the Opening Project of State key Laboratory of Electronic Thin Films and Integrated Devices,China;Project(10KJD430002) supported by the Universities Natural Science Research Project of Jiangsu Province,China;Project(13KJB430006) supported by the Application Program for Basic Research of Changzhou,China;Project supported by the Industrial Center of Jiangsu University Undergraduate Practice-Innovation Training Project,China

摘　　要：ZnO-Bi2O3-based varistor ceramics doped with EU2O3 in a range from 0 to 0.4% were obtained by high-energy ball milling and fired at 900-1000 ℃ for 2 h. XRD and SEM were applied to determine the phases and microstructure of the varistor ceramics. A DC parameter instrument was applied to investigate the electronic properties and V-I characteristics. The XRD analysis of Eu2O3-doped ZnO-Bi2O3-based varistor ceramics shows that the ZnO, Eu-containing Bi-rich, Zn7Sb2O12-type spinel and Zn2Bi3Sb3O14-type which is the pyrochlore phase are present. With increasing Eu2O3 content, the average size of ZnO grain firstly decreases and then increases. The grain boundary defect model was particularly used to explain the excellent nonlinearity of ZnO-Bi2O3-based varistor ceramics with the addition of0.1% Eu2O3 and sintered at 950 ℃.ZnO Bi2O3-based varistor ceramics doped with Eu2O3in a range from 0 to 0.4%were obtained by high-energy ball milling and fired at 900 1 000°C for 2 h.XRD and SEM were applied to determine the phases and microstructure of the varistor ceramics.A DC parameter instrument was applied to investigate the electronic properties and V–I characteristics.The XRD analysis of Eu2O3-doped ZnO Bi2O3-based varistor ceramics shows that the ZnO,Eu-containing Bi-rich,Zn7Sb2O12-type spinel and Zn2Bi3Sb3O14-type which is the pyrochlore phase are present.With increasing Eu2O3content,the average size of ZnO grain firstly decreases and then increases.The grain boundary defect model was particularly used to explain the excellent nonlinearity of ZnO Bi2O3-based varistor ceramics with the addition of 0.1%Eu2O3and sintered at 950°C.

关 键 词：CERAMICS VARISTORS rare earth microstructure electronic properties 

分 类 号：TQ174.1[化学工程—陶瓷工业]