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Effect of sintering temperature on microstructure and nonlinear electrical characteristics of ZnO varistor 被引量:1
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作者 Ahmed Bouchekhlal farida hobar 《Journal of Advanced Dielectrics》 CAS 2018年第2期67-71,共5页
The nonlinear properties of ZBMCCS-based varistors,which are composed of ZnO-Bi_(2)O_(3)-MnO_(2)-Cr_(2)O_(3)-Sb_(2)O_(3)-Co_(3)O_(4) and SiO_(2) are studied inrelation to sintering temperature,in the range of 1280–1... The nonlinear properties of ZBMCCS-based varistors,which are composed of ZnO-Bi_(2)O_(3)-MnO_(2)-Cr_(2)O_(3)-Sb_(2)O_(3)-Co_(3)O_(4) and SiO_(2) are studied inrelation to sintering temperature,in the range of 1280–1350℃.The samples are investigated for grain morphology by using scanning electron microscope(SEM).These samples were examined by using X-ray diffraction patterns(XRD)and DC electrical measurements.X-ray diffraction analysis of the samples show the presence of ZnO,Zn_(2)SiO_(4) willemite phase and Co_(2.33)Sb_(0.67)O_(4) spinel phases.The average grain size of ZnO increased as the sintering temperature increased from 2.57 to 6.84m.In the examined temperature range,the breakdown field decreased from 2992 to 127 V/cm with the increase of sintering temperature.This system gives a relatively high nonlinearity coefficientα=33.61(at a sintering temperature of 1280℃)with a low leakage current of 0.21 mA/cm^(2). 展开更多
关键词 ZnO varistor ceramics MICROSTRUCTURE nonlinear coefficient sintering temperature
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