Influence of Cr2O3 ions on dielectric properties of lead gallium phosphate glass system

Abstract

PbO-Ga2O3-P2O5 glasses containing different concentrations of Cr2O3 ranging from 0 to 1.0 mol % were prepared. The differential thermal analysis and dielectric properties (viz., constant ϵ', loss tan δ, a.c. conductivity σac over a wide range of frequency and temperature) have been studied as a function of the concentration of chromium ions. An anomaly has been observed in the dielectric properties of these glasses when the concentration of Cr2O3 is about 0.4 mol %. This anomaly has been explained in the light of different oxidation states of chromium ions in these glasses.