Abstract

The correlation between high dielectric response and electrical conductivity in CuO ceramic was investigated. The dielectric dispersion was in good agreement with the Debye-like relaxation model at low temperature, but it deviated from the model at low frequencies as the temperature increased. High- ε ′ response in our CuO ceramic was attributed to the contributions of grain and GB corresponding to the grain and GB conductivity relaxations, respectively. The conductivity of GB was found to increase with increasing dc bias.

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