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The Effects of Cu Dopant on the Microstructure and Non-Ohmic Electrical Properties of ZnO Varistors

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Abstract:

The doping effects of Cu on the microstructure and non-ohmic electrical properties of ZnO varistors were studied. Addition of Cu2O can enhance the ZnO grain growth during sintering. The SEM and EDS results revealed that the added Cu mainly distributed in the grain boundary and spinel phases of ZnO varistors. The Cu2O addition increased the both of grain and grain boundary resistances. However it decreased the non-ohmic electrical characteristics of ZnO varistors, which is a good agreement with similar findings on Ag2O additions, but contrasts to the reports of good non-ohmic electrical property which found on binary Cu doped ZnO varistors.

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Periodical:

Advanced Materials Research (Volumes 343-344)

Pages:

160-165

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.343-344.160

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Online since:

September 2011

Authors:

Ji Wei Fan, Xiao Peng Li, Zhen Guo Zhang, Zhi Qiang Jiao, Xiang Yang Liu, Wen Jing Zhang, Poonsuk Poosimma, Robert Freer

Keywords:

Cu Doping, Microstructure, Non-Ohmic Electrical Characteristics, ZnO Varistor

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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