AC ELECTRICAL-PROPERTIES OF LEAD IRON-OXIDE GLASSES

The AC electrical properties of the glasses of compositions (PbO)(100- x)(Fe2O3)(x), where x = 5-30 mol% are reported in the temperature rang e 90-300 K and in the frequency range 0.4-100 kHz. The experimental da ta have been analysed in the light of theoretical models proposed for AC conduction in semiconducting glasses. Analysis shows that classical hopping of electrons over a barrier can adequately explain the temper ature and frequency dependence of the AC conductivity and its frequenc y exponent. Reasonable values of the relaxation time and barrier heigh t have been obtained from the fits of the experimental results to the model.