2003年4月
Structure change on the surface of leached sodium borosilicate glasses
GLASS TECHNOLOGY
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- ,
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- 巻
- 44
- 号
- 2
- 開始ページ
- 71
- 終了ページ
- 74
- 記述言語
- 英語
- 掲載種別
- 出版者・発行元
- SOC GLASS TECHNOLOGY
We have studied a leaching mechanism for Na2O-B2O3-SiO2 glass in I N HNO3. Two glasses with different B2O3/SiO2 ratios in the immiscibility region of Na2O-B2O3-SiO2 (9.4Na(2)O.25.4B(2)O(3).65.2SiO(2) (Glass I), 10.3Na(2)O 32.7B(2)O(3).57.0SiO(2) (Glass H)) were prepared and the structural changes on the surface of the glasses caused by acid leaching were investigated using a Raman microscope. The leaching rate and Si-29 magic angle spinning (MAS) nuclear magnetic resonance (NMR) were also measured. From Glass I, only sodium and boron were leached while a noticeable amount of Si is leached from Glass II together with sodium and boron. Raman spectra for the leached Glass I revealed that sodium borate units are leached in the initial stage and boron oxide units directly connected to SiO2 are removed from the remaining glass in the latter stage. It was found that Glass H is much less durable in acid solution than Glass I Raman spectra and Si-29 NMR strongly suggest that the silicate network is destroyed to form some other silicate related compound.
- リンク情報
- ID情報
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- ISSN : 0017-1050
- identifiers.cinii_nr_id : 9000239248799
- Web of Science ID : WOS:000184153800007