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Alkaline earth titanates and related perovskites which are commonly used as dielectrics in ceramics capacitors may exhibit a long-term degradation of the insulation resistance under simultaneous dc field and temperature stress. The phenomenon can be explained by a field-induced concentration polarization of oxygen vacancies which represents a non-linear transport process and leads to a significant increase of the electronic carrier concentrations.
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Waser et al. (1990) studied this question.
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