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Varistor and giant permittivity properties of SnO2–Zn2SnO4 ceramic matrix composites

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Abstract

(1 − x)SnO2–xZn2SnO4 ceramic matrix composites with x = 0.15, 0.20, 0.25 and 0.30 are prepared by traditional ceramic processing. The varistor and dielectric properties have been measured before, and after heat treatment in vacuum and atmosphere. Before heat treatment, the ceramic with x = 0.20 has good nonlinear electrical property (α = 5.5), low breakdown electric field (E 1.0 = 7.4 V/mm) and giant permittivity (40 Hz, 40 °C, ε r = 2 × 104). However, the good varistor and dielectric properties are greatly degraded after vacuum treatment. By a following heat treating in atmosphere, the degradations of the electrical properties are restored except the high permittivity. The results strongly suggest that varistor and dielectric properties are related to oxygen and/or oxygen vacancies. Reference to the sintering behavior, the original mechanism of oxygen vacancies in SnO2–Zn2SnO4 ceramic composites is proposed and accordingly, the varistor and giant permittivity properties are well understood based on the grain boundary barrier model.

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Acknowledgments

This work was supported by the National Nature Science Foundation of China (No. 11504090).

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Authors and Affiliations

  1. School of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471003, China

    Guo-Zhong Zang, Xiao-Fei Wang, Huan-Huan Liu, Feng-Zi Zhou & Li-Ben Li

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  1. Guo-Zhong Zang
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  2. Xiao-Fei Wang
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  3. Huan-Huan Liu
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Correspondence to Guo-Zhong Zang.

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Zang, GZ., Wang, XF., Liu, HH. et al. Varistor and giant permittivity properties of SnO2–Zn2SnO4 ceramic matrix composites. J Mater Sci: Mater Electron 27, 9836–9841 (2016). https://doi.org/10.1007/s10854-016-5050-z

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  • DOI: https://doi.org/10.1007/s10854-016-5050-z

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