Abstract
Concentration gradients in soda-lime–silica glass subjected to an ion exchange in molten KNO 3 at a temperature below the strain point of the glass were explored by Auger electron spectroscopy. Measurement showed an excess of oxygen in the modified layer of glass and similar shapes of potassium and oxygen concentration profiles over most of the modified region. Replacement of smaller sodium ions by larger potassium ions appears to be accompanied by oxygen diffusion from molten salt into glass. On the basis of these results, a microscopic model for ion-exchange processes in silicate glasses, including mixed alkali effect, is proposed.
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