The effect of grain boundaries on the electrical properties of zinc oxide-based varistor

Shr Nan Bai; Tseung-Yuen Tseng

doi:10.1007/BF02665886

The effect of grain boundaries on the electrical properties of zinc oxide-based varistor

Shr Nan Bai^*, Tseung-Yuen Tseng

^*Corresponding author for this work

National Chiao Tung University

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The ac response of ZnO-based varistors was measured as a function of temperature and applied electric field. Conductivity-frequency measurements indicated that the grain boundaries of the ZnO varistors were amorphous. The device resistance was found to decrease as the temperature/applied field increased. This was attributed to deterioration of the insulating property of the grain boundaries due to generation of conduction carriers in the ZnO grains. As a large amount of these charge carriers passed through the grain boundaries, the ZnO varistors remarkably revealed a non-Debye characteristic that can be modeled by a capacitance to simulate the behavior of the grain boundaries.

Original language	English
Pages (from-to)	1073-1079
Number of pages	7
Journal	Journal of Electronic Materials
Volume	21
Issue number	11
DOIs	https://doi.org/10.1007/BF02665886
State	Published - 1 Nov 1992

Keywords

Ac response
Grain boundary
ZnO varistor

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10.1007/BF02665886

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AB - The ac response of ZnO-based varistors was measured as a function of temperature and applied electric field. Conductivity-frequency measurements indicated that the grain boundaries of the ZnO varistors were amorphous. The device resistance was found to decrease as the temperature/applied field increased. This was attributed to deterioration of the insulating property of the grain boundaries due to generation of conduction carriers in the ZnO grains. As a large amount of these charge carriers passed through the grain boundaries, the ZnO varistors remarkably revealed a non-Debye characteristic that can be modeled by a capacitance to simulate the behavior of the grain boundaries.

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