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Microstructure and properties of ZnO-Bi2O3-based varistor ceramics via flash sintering

Ming Jiang (School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, China and School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, China)
Mengyang Shi (School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, China and School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, China)
Jiamao Li (School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, China)
Juan Liu (School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, China)
Lei Zhang (China Innovation Academy of Intelligent Equipment Co. Ltd, Ningbo, China)
Jian Qin (Zhengzhou Research Institute of Mechanical Engineering Co. Ltd, Zhengzhou, China)
Yongtao Jiu (Zhengzhou Research Institute of Mechanical Engineering Co. Ltd, Zhengzhou, China)
Bin Tang (State Key Laboratory of Advanced Materials and Electronic Components, Zhaoqing, China)
Dong Xu (School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, China)

Microelectronics International

ISSN: 1356-5362

Article publication date: 16 August 2022

Issue publication date: 27 October 2022

131

Abstract

Purpose

This paper aims to study the effects of MnO2 on the ZnO–Bi2O3-based varistor prepared via flash sintering (FS)

Design/methodology/approach

MnO2-doped ZnO–Bi2O3-based varistors were successfully prepared by the FS with a step-wise increase of the .current in 60 s at the furnace temperature <750°C under the direct current electric field of 300 V cm−1. The FS process, microstructure and the electrical performance of ZnO–Bi2O3-based varistors were systematically investigated.

Findings

The doping of MnO2 significantly decreased the onset temperature of FS and improved the electrical performance of FS ZnO varistor ceramic. The sample with 0.5 mol% MnO2 doping shows the highest improvement, with the nonlinear coefficient of 18, the leakage current of 16.82 µA, the threshold voltage of 459 V/mm and the dielectric constant of 1,221 at 1 kHz.

Originality/value

FS is a wonderful technology to enhance ZnO varistors for its low energy consumption, and a short sintering time can reduce grain growth and inhabit Bi2O3 volatilize, yet few research studies work on that. In this research, the authors analyzed the FS process and improved the electrical characteristics through MnO2 doping.

Keywords

Acknowledgements

National Natural Science Foundation of China. Grant No. 52072004. The Key Research and Development Program of Anhui Province. 2022i01020008. Key Research and Development Program of Anhui Province and State Key Laboratory of Advanced Materials and Electronic Components. No.FHR-JS-202011006.

Citation

Jiang, M., Shi, M., Li, J., Liu, J., Zhang, L., Qin, J., Jiu, Y., Tang, B. and Xu, D. (2022), "Microstructure and properties of ZnO-Bi2O3-based varistor ceramics via flash sintering", Microelectronics International, Vol. 39 No. 4, pp. 166-174. https://doi.org/10.1108/MI-05-2022-0079

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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