Admittance Spectroscopy of Y2O3-doped ZnO Varistors Sintered at Different Temperature
ZnO varistors are multicomponent polycrystalline ceramics with highly nonlinear current-voltage characteristics and surge energy absorption capabilities.The voltage gradient of the ZnO varistor is inversely proportional to its average grain size.Recently,the rare-earth oxides have been reported as growth inhibitor of ZnO grains to obtain high voltage gradient.Although the dopant of rare-earth oxides can remarkably enhance the voltage gradients of varistor samples,their leakage currents and nonlinear coefficients deteriorate at the same time.In this paper,the sintering effects on electrical characteristics and admittance spectroscopies of ZnO varistor samples doped with yttrium oxides were investigated.Samples were fabricated under different sintering temperatures,including 1000℃,1100℃,1200℃ and 1300℃.Then,the electrical characteristics and admittance spectroscopies of these varistor samples were measured.The measured current-voltage results behave special U-type curves related to sintering temperature.Furthermore,the admittance spectroscopy of these samples revealed the sintering effects on the intrinsic defects of ZnO varistors.
ZnO Varistor Admittance spectroscopy Y2O3
Jun Liu Jinliang He Jun Hu Wangchen Long Fengchao Luo
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
国际会议
The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))
哈尔滨
英文
382-385
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）