A model which quantitatively accounts for the important features of prebreakdown conduction in ZnO‐based metal oxide varistors in presented. The prebreakdown current dependence with applied voltage and temperature enables us to extract several features for the grain boundary. Estimations have been made for the local electron concentration in polycrystalline ZnO near the grain boundary and for the grain boundary potential barrier height.
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Castro et al. (1992) studied this question.
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