Hydrated glass was prepared by the treatment in an autoclave. Specimen in a good state was obtained under unsaturated water vapor pressure conditions. The obtained glass has an silica-rich hydrated layer and proved to be more durable than the original glass. There are some kinds of hydroxyl species in the hydrated glass and there are some patterns in the depth profile of water, indicating that the rate-controlling process is not a simple diffusion and the hydration process is a complicated reaction depending on the conditions. Water in hydrated glass is tightly bonded and a disintegration of hydrated glass in this study occurs at more than 560°C.
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Yamanaka, H., Nishii, J., Akai, T. et al. Preparation of Hydrated Glass as a Model of Long-Term Leached Nuclear Waste Glass. MRS Online Proceedings Library 353, 95–100 (1994). https://doi.org/10.1557/PROC-353-95