Abstract
The a.c. conductivity of copper-free and copper-containing lead silicate glasses of the base composition 80PbO–20SiO2 (wt %), equivalent to 51.5PbO–48.5SiO2 (mol %), was measured at different temperatures and frequencies. The ratio Cu2+/Cutotal as a function of CuO content in the glasses studied was quantitatively determined by ESR. The results were used to derive the mechanism of conduction in lead silicate glasses. Values of a.c. conductivity, dielectric loss and dielectric constant decreased with the addition of CuO up to 0.25 g/100 g glass and increased with further additions of CuO. This may be due to the gradual decrease in the ratio Cu2+/Cutotal (as indicated by ESR) with increasing CuO content, through reduction of some Cu2+ ions to Cu+ ions, which have higher mobility. The a.c. conductivities agreed with the Anderson and Stuart model and indicated that the conduction mechanism was ionic in character.
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