Kinetics of Dissolution and Diffusion of the Oxides of Iron in Sodium Disilicate Glass

The dissolution and diffusion of the three oxides of iron in sodium disilicate glass from 900° to 1100°C were controlled by diffusion in the molten glass. Concentration profiles were determined with an electron microprobe. Diffusion kinetics were applied on the basis of an ideal binary couple with concentration‐independent inter‐diffusivities. Concentration dependence of the inter‐diffusivities was determined by the Boltzmann‐Matano method, and the resulting interdiffusivities were interpreted in terms of a ternary diffusion model. The relation among the self‐diffusion coefficients was image The activation energy for the interdiffusion process for all the iron oxide‐sodium disilicate couples was 30 kcal.