The influence of V2O5 on dielectric properties of PbO-B2O3-Bi2O3 glasses

Abstract

The influence of V2O5 (ranging from 0 to 1.0 mol %) on the structural aspects of PbO-B2O3-Bi2O3 glass system, from a systematic study of dielectric properties (dielectric constant ϵ, loss tan δ and a.c. conductivity σac, over a wide range of frequency and temperature) and IR spectra has been investigated. The dielectric constant ϵ'and loss at room temperature (30 °C) and at 100 kHz of pure PbO-B2O3-Bi2O3 glasses are measured to be 9.61 and 0.0013 respectively. These values are found to increase with the decrease in frequency. The dielectric constant and loss have been observed with increase in the concentration of V2O5 (up to 1.0 mol %). In the IR spectra of PbO-Bi2O3-B2O3: V2O5 glasses, the intensity of the band due to BO3 structural units is observed to grow at the expense of more ordered BO4 structural units with the increase in the concentration of V2O5 up to 1.0 mol %. The analysis of these results indicated that as the concentration of V2O5 is raised up to 1.0 mol %, there is a growing degree of disorder in the glass network.