Composition dependent AC electrical properties of lead vanadate glass

Abstract

The frequency and temperature dependence of the complex ac electrical properties are reported in the frequency range 0.1-100 kHz and in the temperature range 80-300 K for the lead vanadate glass in a wide composition range (50-90 mol% of V₂O₅). The experimental results are analysed with reference to the theoretical models based on quantum tunneling through a barrier and classical hopping over a barrier. It is observed that the large polaron tunneling is the dominant charge transfer mechanism for the glass compositions with 80 and 90 mol% of V₂O₅, while classical hopping plays significant role in the charge transfer mechanism for other glass compositions. Possible reasons for the change of loss mechanism with compositions are suggested.