Structural implications of water and boron dissolution in albite glass
UNSPECIFIED. (2004) Structural implications of water and boron dissolution in albite glass. JOURNAL OF NON-CRYSTALLINE SOLIDS, 337 (3). pp. 207-219. ISSN 0022-3093Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2004.04.007
A combined nuclear magnetic resonance, infrared and Raman spectroscopic study oil the effect of water dissolution on the structure of B-bearing aluminosilicate glasses is presented. The base composition was albite (NaAlS3O8) to which different amounts of B2O3 (4.8, 9.1, 16.7 wt%) were added. Hydrous glasses containing 4.4 +/- 0.1 wt% water were synthesized at pressures of 2000 bar. The results show that B dissolves in both dry and hydrous glasses by forming predominantly trigonal BO3 groups although some tetrahedral BO4 is also present. In anhydrous glasses prepared at high pressures (above 10 kbar) the fraction of BO4 increased. The hydrous glasses contain more BO4 groups compared to the dry counterparts, suggesting that this species is stabilized by water. The Raman and NMR (O-17, Al-27, Si-29) spectra show that B interacts with the aluminosilicate network by formation of Si-O-B and probably Al-O-B units. In the hydrous glasses the water speciation changes significantly towards higher hydroxyl concentrations with increasing B-content. The NIR peaks, which are related to OH groups and molecular H2O, develop additional shoulders, suggesting that possibly B-OH complexes are formed. (C) 2004 Elsevier B.V. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||T Technology > TP Chemical technology
T Technology > TA Engineering (General). Civil engineering (General)
|Journal or Publication Title:||JOURNAL OF NON-CRYSTALLINE SOLIDS|
|Publisher:||ELSEVIER SCIENCE BV|
|Official Date:||15 July 2004|
|Number of Pages:||13|
|Page Range:||pp. 207-219|
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