Microstructures and electrical properties of ZnO–V₂O₅–MnO₂ varistors with low-temperature sintering

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• 作者：Xiao Qu ; Wei-Jie Sun ; Mao-Hua Wang…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：2
• 页码：1909-1913
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

The microstructures and electrical properties of 95 at.%ZnO + xV₂O₅ + (5−x)MnO₂ varistors (x = 1, 2, 3, 4, 5 at.%) sintering at 900 °C were investigated. The microstructure of all the samples consisted of ZnO grain with β-Zn₃(VO₄)₂ and γ-Zn₃(VO₄)₂ as minority secondary phases. The average grain size decreased from 10.4 to 4.5 μm with the decrease of V₂O₅ mol fraction and it is attributed that ZnO grains could probably grow rapidly in the presence of a rich liquid phases related to V₂O₅ concentrations. The breakdown voltage increases from 6444 to 1446 V/cm with increase of V₂O₅ mol fraction due to the decrease of the average grain size. The samples containing 2 at.% V₂O₅ and 3 at.% MnO₂ varistors exhibited the best nonlinear properties, with present nonlinear coefficient (20.8).