Two peaks are observed in tan delta against frequency isothermals in cobalt doped potassium chloride crystals in the temperature range 100 degrees C to 200 degrees C and frequency range 10 2 Hz to 10 5 Hz. The low and high frequency peaks have been labelled as A and B, respectively. The logarithm of peak frequencies plotted against 1/T gave straight lines for both the peaks. The values of the activation energy calculated from the slope of the straight lines are 0.83+or-0.06 eV and 0.85+or-0.06 eV for the A and B peaks respectively. None of the A and B peaks were found to be due to Maxwell-Wagner losses or interfacial polarization.
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Jain et al. (1970) studied this question.
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