摘要
Abstract
The optimal Y and Ce co-doping ratio was determined by adjusting the ratio between Y and Ce.The microstructure of the sample was characterized by X-ray diffraction and scanning electron mi-croscopy,and the grain size distribution was fitted using a lognormal probability density function.Meas-ure the breakdown voltage,leakage current,and nonlinear coefficient of the sample using a metal oxide DC parameter tester,and the 8/20 μs lightning wave pulse and 2 ms square wave pulse current withstand capabilities were tested by a pulse current testing device.The precision impedance analyzer was adopted to test the C-V characteristic curves of the samples.It was found that the coordination of Y and Ce ele-ments can optimize the grain size distribution of ZnO.When the ratio of the two rare earth ions is appro-priate,it is easier to penetrate into the interior of the crystal grain,with less concentration at the grain boundaries,resulting in higher barrier potential.The more uniform the structure of the varistor,the more uniform the energy distribution,and the greater the pulse energy it can withstand.关键词
共掺杂/稀土氧化物/压敏电阻/电性能/高电位梯度Key words
co-doping/rare earth oxide/varistors/electrical performance/high potential gradient
