Thermodynamic study of glasses in Ag-As-Se system using EMF method with Ag4RbI5 solid electrolyte

The EMF method with Ag4RbI5 solid electrolyte was used to study silver solubility in Ag-As-Se glasses on the basis of the cross-sections of (I) Ag-As0.25Se0.75, (II) Ag-As0.33Se0.67, (III) Ag-As0.4Se0.6, and (IV) Ag-As0.5Se0.5. It is found that silver solubility reaches 30 and 40 at % in sections (I), (IV) and (II), (III), accordingly. The data of EMF measurements were used as a basis for calculation of partial polar functions of Ag in glasses. The Gibbs-Duhem equations were integrated to calculate thermodynamic functions of silver dissolution in vitreous AsxSe1 − x (x = 0.25; 0.33; 0.4; 0.5), from which the corresponding data for the latter were used to obtain the standard integral thermodynamic functions of the mixing of glasses. The obtained results were compared with the thermodynamic data for crystalline silver selenoarsenites.