Abstract
Hydroxyl has been removed from three different commercial vitreous silicas at temperatures between 500 and 1100°C. The results indicate a change in activation energy with temperature. This change may be due to a change in the dehydroxylation mechanism with temperature or due to a change in the fictive temperature during treatment. The entry of water into five commercial silica glasses has been studied between 800 and 1000°C. A change in the solubility as a function of time at 1000°C is evident. A comparison of the results for the entry and removal of water is made.
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