Abstract
Reaction between water and lithium borate glasses containing 5–30 mole per cent Li2O and potassium borate glasses containing 5–33.3 mole per cent K2O was studied for periods ranging from a few seconds to 64 minutes and at temperatures 4°C to 29°C. The amounts of alkali and B2O3 extracted were determined by titrametric methods. From all of the glasses the amounts of alkali and B2O3 extracted increased linearly with time. The ratio of the constituents in the extract was found to be the same as in the glasses indicating that the glasses dissolve as a whole. The activation energy for the extraction from the lithium glasses passed through a minimum in the region of 15 to 20 mole per cent alkali, while for the potassium and sodium glasses maximum was obtained in the same composition region. Also a linear relationship could be obtained between the rate of extraction of the constituent and the radius of the alkali ions in glasses containing upto 15 mole per cent of alkali above which this relationship was not obeyed.
Published Version
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