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Formation and Durability of Hydrated Layers for Several Oxide Glasses

Published online by Cambridge University Press:  15 February 2011

Junji Nishii ,
Tomoko Akai ,
Masaru Yamashita ,
Hiroshi Yamanaka  and
Hajimu Wakabayashi
Junji Nishii
Affiliation:
Department of Optical Materials, Osaka National Research Institute, AIST 1–8–31 Midorigaoka, Ikeda, Osaka 563, Japan
Tomoko Akai
Affiliation:
Department of Optical Materials, Osaka National Research Institute, AIST 1–8–31 Midorigaoka, Ikeda, Osaka 563, Japan
Masaru Yamashita
Affiliation:
Department of Optical Materials, Osaka National Research Institute, AIST 1–8–31 Midorigaoka, Ikeda, Osaka 563, Japan
Hiroshi Yamanaka
Affiliation:
Department of Optical Materials, Osaka National Research Institute, AIST 1–8–31 Midorigaoka, Ikeda, Osaka 563, Japan
Hajimu Wakabayashi
Affiliation:
New Glass Research Center, Yamamura Glass Co., Ltd. 2–1–18 Naruohama, Nishinomiya, Hyogo 663, Japan
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Abstract

Formations and durabilities of hydrated layers were compared between a soda-aluminosilicate (NAS), a soda-lime-aluminosilicate(NCAS) and a soda-lime-alumino-borosilicate(NCABS) glasses. The first step of our study was to prepare the optically transparent hydrated layers on the surface of specimens by an autoclave(400 °C, 20 kgf/cm2) treatment. Distributions of OH groups in hydrated layers were analyzed by an etch sectioning and FTIR measurement. The rates of hydration of the glasses were in the order NAS»NCAS>NCABS. The hydration of the NCABS glass, which is a modified nuclear waste glass, required the treatment longer than those of the NAS and NCAS glasses. In the second step, we investigated the durabilities of hydrated layers by immersing the specimens into a distilled water at 100 °C. The dissolutions of hydrated layers were confirmed for each glass. The dissolution rates of hydrated layers were in the order NCAS>NCABS»NAS. It has become apparent by an XPS analysis that the highest durability of the hydrated NAS glass was due to the formation of a sodium free Al2O3-SiO2 layer on the surface. The hydrated layer of the NCAS glass, while the sodium ions were almost leached out during immersion, dissolved to water most quickly than those of other glasses. In the hydrated layer of the NCABS glass, a half amount of sodium and boron ions remained and inhibited the dissolution of hydrated layer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 47
Copyright
Copyright © Materials Research Society 1995

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References

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