Water diffusitivities and solubilities have been measured at 1200 deg C in melts of ternary soda-lime-silica compositions containing 60-75 mol% silica.This work represents the first systematic study of water diffusion in soda-lime-silica melts.The diffusivity of water in these melts decreases slightly as lime replaces soda for melts containing a constant amount of silica,while the diffusivity of water increases as the total modifier oxide concentration increases.The water solubilities reported here are similar to those of earlier work by franz and Scholze,with a general trend of decreasing water solubility as lime replaces soda in the melt.The glass ransformation temperature for sodium silicate and soda-lime-silica glasses decreases by approx4 K for an increase of 100 wtppm in the bound water concentration.A model for predicting the practical extinction coefficient for water in alkali-alkaline earth-silica glasses is presented.
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