Abstract
The performance parameters e.g. non-linear coefficient (α) and breakdown electric field (Eb 1mA/cm 2 ) of ZnO based ceramic varistors were found to improve after the addition of 10 mol% MgO. The improvement in the varistor properties is examined by ac impedance spectroscopy technique in the frequency range (1 Hz–10 MHz) between temperature 25–250°C and understood in terms of differing contributions from the equivalent electrical circuit elements.
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