Raman Spectra of Rings in Silicate Materials
- 1 January 1986
- journal article
- Published by Springer Science and Business Media LLC in MRS Proceedings
Abstract
Raman spectroscopic studies on gel-derived silicates have confirmed that narrow bands near 607 cm-1 and 492 cm-1, first observed in the Raman spectrum of fused silica, are associated with three- and four-fold siloxane rings. Using these results, we have identified three- and four-fold siloxane rings in other high-surface-area silica materials, including leached glasses and Cab-OSil. This Raman spectroscopic evidence not only shows that small siloxane rings are a common characteristic of a number of silica materials but also suggests that they form preferentially at silica surfaces. This paper reviews the Raman spectroscopic evidence that led to the identification of the vibrational frequencies of the small siloxane rings and presents the results of Raman experiments on high-surface-area silica materials in which the concentration of small siloxane rings is enhanced compared to fused silica.Keywords
This publication has 14 references indexed in Scilit:
- Sol → gel → glass: I. Gelation and gel structureJournal of Non-Crystalline Solids, 1985
- Vibrational Decoupling of Rings in Amorphous SolidsPhysical Review Letters, 1984
- Slow fracture model based on strained silicate structuresJournal of Applied Physics, 1984
- High temperature intrinsic defects in fused silicaJournal of Non-Crystalline Solids, 1984
- Microscopic origin of anomalously narrow Raman lines in network glassesJournal of Non-Crystalline Solids, 1984
- The densification of monolithic gelsJournal of Non-Crystalline Solids, 1984
- Further investigations on Raman spectra of silica gel evolving toward glassJournal of Non-Crystalline Solids, 1984
- Infrared studies of reactions on oxide surfaces. 7. Mechanism of the adsorption of water and ammonia on dehydroxylated silicaThe Journal of Physical Chemistry, 1976
- Neutron irradiation effects and structure of noncrystalline SiO2The Journal of Chemical Physics, 1974
- The structure of vitreous silica: Validity of the random network theoryPhilosophical Magazine, 1972