Influence of Chromium Ions on the Dielectric Properties of the PbO-Ga2O3-P2O5 Glass System

Abstract

PbO-Ga2O3-P2O5 glasses containing different amounts of Cr2O3, ranging from 0 to 1.0 mol%, were prepared. The dielectric properties (viz., constant ∊', loss tan δ, ac conductivity δac over a wide range of frequencies and temperatures, dielectric breakdown strength) 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 with the aid of data of differential thermal analysis and optical absorption spectra of these glasses. © 2007, Verlag der Zeitschrift für Naturforschung. All rights reserved.