Physical properties of PbO-Al₂O₃-B₂O₃ glasses doped with Cr₂O₃

Abstract

PbO-Al₂O₃-B₂O₃ glasses containing different concentrations of Cr₂O₃ ranging from 0 to 0.4 mol % were prepared. The dielectric properties (constant e, loss tand, <i style="">ac </i>conductivity s_ac over a range of frequency and temperature and breakdown strength) of these glasses have been studied. The results of these studies were analyzed with the aid of data on optical absorption, IR spectra and thermoluminescence studies on these glasses. The analysis suggests that the chromium ions exist in Cr³⁺ state which act as modifiers. When Cr₂O₃ is present in higher concentrations in the glass matrix, these ions seem to exist in Cr⁶⁺ state and take part in network forming positions with structural units.