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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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