Effects of Er2O3 on Electrical Properties of the SnO2·CoO·Ta2O5 Varistor System | 王春明 | 中国物理快报(英)

Effects of Er2O3 on Electrical Properties of the SnO2·CoO·Ta2O5 Varistor System

王春明 已出版文章查询
王春明
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王矜奉
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陈洪存
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苏文斌
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臧国忠
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亓鹏
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1School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100


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We investigate the effects of Er2O3 on electrical properties of the SnO2·CoO· Ta2 O5 varistor system sintered at 1400 ℃. It is found that all the samples have excellent nonlinear electrical characteristics and the sample with 0.50mol% Er2O3 has the best nonlinear electrical property and the highest nonlinear coefficient (α = 43.7). The high nonlinear coefficient value obtained in the system indicates that the SnO2-based varistor is a candidate for ZnO-based varistors in commercial applications. Er2O3 additive can significantly affect the average grain size. With increasing Er2O3 concentration from 0. 10mol% to 1.00mol%, the average grain size decreases from 21.2μm to 10. 6μm, the breakdown electrical field increases from 208 V/mm to 459V/mm, and the relative electrical permittivity decreases from 2440 to 1210. The reason that the grain size decreases with increasing Er2 O3 concentration is explained. Also, we present a modified defect barrier model to illustrate the grainboundary barrier formation of Er2 O3-doped SnO2 based varistors.

[2] WANG Jin-Feng,CHEN Hong-cun,ZHANG Xing-Hua,ZHANG De-jun,ZHONG WEI-LIE.Nonlinear Electrical Behaviour of the TiO2.Sb2O3 System[J].中国物理快报(英文版),2000(07):530-531.

[3] LI Chang-Peng,WANG Jin-Feng,WANG Yong-Jun,SU Wen-bin,CHEN Hong-cun,ZHUANG De-Xin.Nonlinear Electrical Behaviour of the TiO2·Y2O3·Nb2O5 System[J].中国物理快报(英文版),2001(05):674-676.

[22] Wang CM.;Wang JF.;Chen HC.;Wang WX.;Su WB.;Zang GZ.;Qi P. .Effects of Ta2O5 on the grain size and electrical properties of SnO2-based varistors[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,2003(23):3069-3072.


语种: 英文   

基金国家自然科学基金(50072013)


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