Mixed Glass Former Effect in Ag₂O–SeO₂–TeO₂ Glasses: Dependence on Characteristic Displacement of Mobile Ions and Relative Population of Bond Vibrations

Abstract

We have studied and observed a mixed glass former effect in yAg2O–(1–y)[xSeO2–(1–x)TeO2] glasses for different modifier contents. We have carried out electrical measurements on these glasses in the frequency range from 10 Hz to 2 MHz and in the temperature range of 193–393 K. The crossover frequency obtained from the conductivity spectra also exhibits a mixed glass former effect similar to the conductivity. The scaling of the conductivity spectra reveals the composition- and temperature-independent nature of the ion conduction mechanism. The characteristic displacement of the silver ions has been obtained from the conductivity spectra in the framework of linear response theory, and it shows a strong dependence on the mixed former ratio. We have also studied the modification of the network structure of these glasses due to the mixing of glass formers using infrared spectra and their influence on ion dynamics. We have shown that the mixed glass former effect is associated with the relative population of bonds of structural units.