Chemical Durability of Fluorozirconate Glasses

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Abstract
The chemical durability of four fiuorozirconate glasses was tested in distilled water at 20° and 80°C. Overall dissolution of the glasses, obtained from weight losses, followed a nearly perfect t1/2 dependence, and evidence for an F‐/OH‐ ion exchange between glass and solution was found. These observations, however, do not necessarily imply a simple diffusion‐controlled process. All surfaces were cracked and showed crystalline deposits of differing composition. A protective layer did not form on the surface.

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