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Effects of SiO2/Cr2O3 ratios on microstructures and electrical properties of high voltage gradient ZnO varistors

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Abstract

The effect of various proportions of SiO2 and Cr2O3 doping on the micro-characteristics and the electrical properties of the ZnO varistors were investigated. As the SiO2/Cr2O3 ratio increased, the voltage gradient increased and then decreased, the nonlinear coefficient α increased, while the leakage current showed the opposite trend, meanwhile the residual voltage ratio was almost stable. When the SiO2/Cr2O3 ratio was 1.7 mol% vs. 0.6 mol%, the ZnO varistors sintered at 1155 °C exhibited excellent comprehensive electrical properties with voltage gradient of 329.9 V/mm, nonlinear coefficient of 65.1, leakage current of 0 µA, residual voltage ratio of 1.663, and aging starting power of 0.72 W. The varistors were in good condition after being struck 18 times of 250 A square wave energy pulse impact, showing a great potential in the industrial application of power distribution systems.

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Acknowledgments

The authors acknowledge the support of the Shanghai Natural Science Foundation, Grants (17ZR1410300) and the National Natural Science Foundation of China (21571125). The authors appreciate the porosity calculation work by TDK (Zhuhai FTZ) Co., Ltd.

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Authors and Affiliations

  1. Nano-Science and Technology Research Center, Shanghai University, Shanghai, 200444, China

    Xuejun Ruan, Xin Ren, Wenting Zhou, Xi Xu, Xin Wang, Manyu Wang, Ying Yan, Zheng Yao, Wen Shi & Wenqi Yu

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  1. Xuejun Ruan
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  2. Xin Ren
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Correspondence to Xin Ren or Zheng Yao.

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Ruan, X., Ren, X., Zhou, W. et al. Effects of SiO2/Cr2O3 ratios on microstructures and electrical properties of high voltage gradient ZnO varistors. J Mater Sci: Mater Electron 30, 12113–12121 (2019). https://doi.org/10.1007/s10854-019-01569-6

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  • DOI: https://doi.org/10.1007/s10854-019-01569-6

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