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Effects of Y2O3 on the microstructure and electrical properties of Pr-ZnO varistors

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Abstract

Effects of Y2O3 contents on the microstructure and electrical properties of Pr6O11-based ZnO varistor have been studied. The varistor voltage (V1mA) and the nonlinear exponent (α) increased with increasing Y2O3 contents, whereas the dielectric constant decreased. Y-rich phase segregated at nodal points in grain boundaries. The average grain size decreased with increasing Y2O3 content. The specimen with 4.0 mol% Y2O3 sintered at 1285 ∘C exhibited the highest nonlinear exponent (α = 77) with the dielectric constant, ~352 at 1 kHz.

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Authors and Affiliations

  1. Department of Materials Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, 440-746, Korea

    J. S. Park & Y. H. Han

  2. Joinset Co., Ltd., Ansan, 425-110, Korea

    K. H. Choi

Authors
  1. J. S. Park
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  2. Y. H. Han
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  3. K. H. Choi
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Correspondence to Y. H. Han.

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Park, J.S., Han, Y.H. & Choi, K.H. Effects of Y2O3 on the microstructure and electrical properties of Pr-ZnO varistors. J Mater Sci: Mater Electron 16, 215–219 (2005). https://doi.org/10.1007/s10854-005-0770-5

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  • DOI: https://doi.org/10.1007/s10854-005-0770-5

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