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PbO-Ga 2 O 3 -P 2 O 5  glasses containing different amounts of Cr 2 O 3 , ranging from 0 to 1.0 mol%, were prepared. The dielectric properties (viz., constant ε’, loss tanδ , ac conductivity σac 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 Cr 2 O 3  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.

Influence of Chromium Ions on the Dielectric Properties of the PbO-Ga 2 O 3 -P 2 O 5 Glass System