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Effect of Cr2O3 on the electrical properties of multicomponent ZnO varistors at the pre-breakdown region

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Abstract

The effect of Cr2O3 on the electrical properties of the multicomponent ZnO varistors was investigated using voltage-current curves and impedance spectroscopy. The structure and morphological modifications were analysed by X-ray diffraction and scanning electron microscopy, respectively. It was observed in samples with addition 0.1 mol % Cr2O3 that there was an improvement in the electrical properties of the varistors, but the increase in concentration had a deleterious effect on the potential barrier at the grain boundary. The excess Cr2O3 segregates at the grain-boundary region and increases the donor concentration, leading to a higher leakage current.

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Authors and Affiliations

  1. Departamento de Engenharia de Materiais, Universidade Estadual de Ponta Grossa, Caixa Postal: 663, 84031510, Ponta Grossa, Pr Brazil

    S. A. Pianaro

  2. LIEC-DQ, Universidade Federal de São Carlos, Caixa Postal: 676, 13565-905, São Carlos, SP Brazil

    E. C. Pereira, L. O. S. Bulhões & E. Longo

  3. Instituto de Química, UNESP, Caixa Postal: 355, 14800900, Araraquara, SP Brazil

    J. A. Varela

Authors
  1. S. A. Pianaro
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  2. E. C. Pereira
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  3. L. O. S. Bulhões
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  4. E. Longo
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  5. J. A. Varela
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Pianaro, S.A., Pereira, E.C., Bulhões, L.O.S. et al. Effect of Cr2O3 on the electrical properties of multicomponent ZnO varistors at the pre-breakdown region. JOURNAL OF MATERIALS SCIENCE 30, 133–141 (1995). https://doi.org/10.1007/BF00352142

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  • DOI: https://doi.org/10.1007/BF00352142

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