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The Influence of ZnF2 Doping on the Electrical Properties and Microstructure in Bi2O3–ZnO-Based Varistors

Authors

  • Lihong Cheng,

    1. State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Liaoying Zheng,

    1. State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Guorong Li,

    Corresponding author
    1. State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
      †Author to whom correpsondence should be addressed. e-mail: grli@sunm.shcnc.ac.cn
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  • Kaiyang Yuan,

    1. State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Yan Gu,

    1. State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Fuping Zhang

    1. State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • S. Hirose—contributing editor

  • This work was supported by NSFC of China (no. 50675218 and no. 10876041), the 863 project of China (no. 2006AA03Z437), and key project of Shanghai (no. 07XI-023).

†Author to whom correpsondence should be addressed. e-mail: grli@sunm.shcnc.ac.cn

Abstract

ZnO varistors with different amounts of ZnF2 from 0.00 to 0.80 mol% were prepared using a solid-state reaction technique, to explore the potential application of ZnO. The F-doping effects on the microstructure and electrical properties of ZnO-based varistors were investigated. The average grain size of ZnO increased from 4.93 to 6.48 μm as the ZnF2 content increased. Experimental results showed that as the ZnF2 content increased, the breakdown voltage decreased from 617 to 367 V/mm, and the nonlinear coefficient did not change much. However, a slight increase was observed in the leakage current. Besides, when the ZnF2 content increased, the donor concentration increased from 0.669 × 1018 to 8.720 × 1018 cm−3. The study indicated that ZnF2 played a similar role as sintering aids to promote grain growth and the substitutional F atoms in the bulk served as a donor to increase the donor concentration.

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