Abstract
Depth profiles of the glass constituents and of hydrogen were determined in water leached glasses with composition 20Na2O·yRO·(80−y)SiO2 (R = Ca, Mg and Zn) by means of the SIMS. The amount of hydrogen in the leached layer is a function of the RO content of the glass. The temperature dependence of the sodium leaching appears to be independent of glass composition. The experimental data can be accounted for within the framework of the diffusion of molecular water, the water mobility decreasing y. Leaching of divalent cations was only observed for a glass with the disilicate composition.
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