Dielectric and conductivity relaxation in lead vanadate glass

Abstract

The dielectric and conductivity relaxation of lead vanadate glasses in a wide composition range are reported in the frequency range 0.1-1000 kHz and in the temperature range 120-390 K. Dipolar and conductivity relaxation models have been used to analyse the experimental data. It has been observed that, although the experimental data are consistent with both models, the dipolar model gives more information for the distribution of relaxation times. The strong asymmetry observed in the dispersion of loss arises from the effect of Pb²⁺ ions on the VO₅ group present in the glass network. High values of the static and high-frequency dielectric constants are observed and are ascribed to the high Pb-O and V-O bond strengths in these glasses.