Models for copper-alkali ion exchange in alkali aluminosilicate glasses

Abstract

Several investigators [8-15] have developed binary or multicomponent interdiffusion models for ionic crystals, ceramic, and glass. However, very little practical work has been done on the interdiffusion model for Cu⁺ ⟷alkali ion exchange in alkali aluminosilicate glasses. In particular, no work has been done to model Cu⁺ ⟷alkali ion exchange in air. This work establishes a mathematical model for general case of ionic interdiffusion and from this general case to establish a model for binary ionic interdiffusion between glasses and molten salts, based on all the experimental data, as well as on the kinetic and thermodynamic properties of the ion exchange system. The development of a general ionic interdiffusion model is extended to the development of a ionic interdiffusion model with simultaneous oxidation and electronic conduction. The mechanisms for chemical reaction and electronic conduction in glasses are also discussed.