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IR and Raman spectroscopic studies of sol–gel derived alkaline-earth silicate glasses

IR and Raman spectroscopic studies of sol–gel derived alkaline-earth silicate glasses IR and Raman spectroscopies have been utilized to study the structure and vibrational modes of sol–gel-derived binary silicate glasses. The present study is motivated by the immense geological significance and focuses on the MO–SiO 2 (M = Ca, Mg) binary systems in an effort to unveil the role of the CaO and MgO modifiers when incorporated to the 3D silica structure. Glasses in the composition range x =0, 0·1, 0·2, 0·3 and 0·4 prepared by the sol–gel method were compared with the corresponding glasses formed by appropriate mixing of SiO 2 and MO powders through melting and fast cooling. The vibrational spectra of the sol–gel-derived glasses have revealed considerable changes in relative intensities as a function of the MO mole fraction. These changes signify structural modifications on the silica network. The population of the Q 3 species was found to increase for both modified silicate systems. The rate of increase is more pronounced in the CaO–SiO 2 glasses. The extent of network depolymerization in the porous glass is higher at the same content of alkaline earth oxide compared to the bulk glass. The results are indicative of a more ‘defective’ nature of the sol–gel glasses compared to the corresponding melt-quenched ones. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of Materials Science Springer Journals

IR and Raman spectroscopic studies of sol–gel derived alkaline-earth silicate glasses

Bulletin of Materials Science , Volume 34 (2) – Apr 1, 2011

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References (15)

Publisher
Springer Journals
Copyright
Copyright © 2011 by Indian Academy of Sciences
Subject
Material Science; Engineering, general; Materials Science, general
ISSN
0250-4707
eISSN
0973-7669
DOI
10.1007/s12034-011-0064-x
Publisher site
See Article on Publisher Site

Abstract

IR and Raman spectroscopies have been utilized to study the structure and vibrational modes of sol–gel-derived binary silicate glasses. The present study is motivated by the immense geological significance and focuses on the MO–SiO 2 (M = Ca, Mg) binary systems in an effort to unveil the role of the CaO and MgO modifiers when incorporated to the 3D silica structure. Glasses in the composition range x =0, 0·1, 0·2, 0·3 and 0·4 prepared by the sol–gel method were compared with the corresponding glasses formed by appropriate mixing of SiO 2 and MO powders through melting and fast cooling. The vibrational spectra of the sol–gel-derived glasses have revealed considerable changes in relative intensities as a function of the MO mole fraction. These changes signify structural modifications on the silica network. The population of the Q 3 species was found to increase for both modified silicate systems. The rate of increase is more pronounced in the CaO–SiO 2 glasses. The extent of network depolymerization in the porous glass is higher at the same content of alkaline earth oxide compared to the bulk glass. The results are indicative of a more ‘defective’ nature of the sol–gel glasses compared to the corresponding melt-quenched ones.

Journal

Bulletin of Materials ScienceSpringer Journals

Published: Apr 1, 2011

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