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

Author:

Fan Ji Wei1,Li Xiao Peng1,Zhang Zhen Guo1,Jiao Zhi Qiang1,Liu Xiang Yang1,Zhang Wen Jing1,Poosimma Poonsuk2,Freer Robert3

Affiliation:

1. Zhongyuan University of Technology

2. University of Manchester

3. University of Manchester and UMIST

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.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference16 articles.

1. D.R. Clarke, Varistor ceramics. J. Am. Ceram. Soc. Vol. 82 (1999), p.485.

2. T.K. Gupta, J. Am. Ceram. Soc. Vol. 73 (1990), p.1817.

3. L.M. Levinson and H.R. Philipp, Am. Ceram. Soc. Bull. Vol. 65 (1986), p.639.

4. J. Fan and R. Freer, J. Mater. Sci. Vol. 28 (1993), p.1391.

5. J. Fan and R. Freer, Br. Ceram. Trans. Vol. 92(1993), p.221.

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