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Preparation, characterization and dielectric response of a high-breakdown-field ZnO-based varistor

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Abstract

In this study, ZnO-based varistors with a high breakdown field were obtained through BaCO3 doping and sintering at a low temperature of 950 °C. The grain size of the ZnO samples decreased to 1.28 μm, and the breakdown field was enhanced to 3845 V/mm, which is approximately one order of magnitude higher than that of ordinary ZnO-based varistors. The dielectric responses of the ZnO-based varistors were measured in a wide frequency and temperature range. At 193 K, two dielectric relaxation peaks with activation energies of 0.22 and 0.35 eV were observed and considered intrinsic defects; these peaks did not vary with the preparation process. Another dielectric relaxation peak observed in a wide temperature range (283–463 K) was characterized in an impedance plot. This relaxation peak was ascribed to extrinsic defects related to the grain boundary. The resistance values of the grain boundary increased by two orders of magnitude through BaCO3 doping and lowering of the sintering temperature. The corresponding activation energy also increased from 0.53 to 0.74 eV. A parallel resistance–capacitance circuit model was proposed to interpret the variation in the electrical properties of ZnO-based varistors.

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Acknowledgments

This work is supported by the Young Scientists Fund of the National Natural Science Foundation of China (No. 51407019), the Fundamental Research Funds for the Central Universities (Grant No. 106112015CDJZR155509), and the research project provided by the State Key Laboratory of Power Transmission Equipment and System Security and New Technology at Chongqing University (Grant No. 2007DA10512716302).

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Authors and Affiliations

  1. State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Shapingba District, Chongqing, 400044, China

    Xuetong Zhao, Shuai Li, Ruijin Liao, Junyan Zhang & Kanglin Liu

  2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No.28, Xianning West Road, Xi’an, 710049, Shaanxi, China

    Jianying Li

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  1. Xuetong Zhao
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  2. Shuai Li
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Correspondence to Xuetong Zhao.

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Zhao, X., Li, S., Liao, R. et al. Preparation, characterization and dielectric response of a high-breakdown-field ZnO-based varistor. J Mater Sci: Mater Electron 27, 9196–9205 (2016). https://doi.org/10.1007/s10854-016-4957-8

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