Effect of Ho2O3 Doping on Performance of ZnO Varistor
The effect of Ho2O3 doping on the electrical properties and microstructure of ZnO base varistor was investigated.It was found that Ho2O3 is an effective dopant for increasing the breakdown electric filed.The Ho2O3 doping can also improve the nonlinear performance both in low and high current area.But excessive doping of Ho2O3 will decrease the withstanding surge current.With 0.8mol% Ho2O3 doping,the varistor samples exhibit a breakdown voltage of about 400V/mm,a nonlinear coefficient of 80 and the withstanding surge current of 8/20μs,waveshape is higher than 5kA.Ho2O3 dopant can hinder ZnO grain growth and make the crystal grains more uniform.
ZnO varistor Ho2O3 doping High breakdown voltage
Zhen-Ya Lu Yu-Xiang Li Zhi-Wu Chen Jian-Qing Wu
College of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
507-509
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）