29Si MAS NMR studies of the spin-lattice relaxation time and bond-angle distribution in vitreous silica
- 1 April 1986
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Part B
- Vol. 53 (4) , L81-L87
- https://doi.org/10.1080/01418638608244284
Abstract
A preliminary investigation, using 29Si magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR), of the effect of water content on the spinlattice relaxation time, T 1, and Si‒O‒Si bond-angle distribution of vitreous silica is reported. The decrease in T 1 with increase in water content suggests that water acts as a major relaxation centre in vitreous silica and a change in water content is also seen to produce a subtle change in the NMR lineshape. The chemical shift of the 29Si resonance occurs at–111·5 p.p.m. with reference to tetramethylsilane (TMS) and the resulting Si‒O‒Si bond-angle distribution is seen to be asymmetric about a peak at 143· · 1· and is in agreement with the X-ray data of Mozzi and Warren (1969).Keywords
This publication has 10 references indexed in Scilit:
- A model for the distribution of bond angles in vitreous SiO2: PHIL. MAG. LETTERSPhilosophical Magazine Part B, 1985
- Determination of the Si–O–Si bond angle distribution in vitreous silica by magic angle spinning NMRNature, 1984
- Nuclear magnetic resonance of silica polymorphsNature, 1983
- Molecular dynamics simulation of silicon dioxide glassPhilosophical Magazine Part B, 1982
- Ab initio calculated geometries and charge distributions for H4SiO4 and H6Si2O7 compared with experimental values for silicates and siloxanesPhysics and Chemistry of Minerals, 1980
- Refinement of a random network model for vitreous silicon dioxidePhilosophical Magazine Part B, 1980
- A refinement of the structure of vitreous silicaPhilosophical Magazine, 1975
- The structure of vitreous silica: Validity of the random network theoryPhilosophical Magazine, 1972
- The narrowing of NMR spectra of solids by high-speed specimen rotation and the resolution of chemical shift and spin multiplet structures for solidsProgress in Nuclear Magnetic Resonance Spectroscopy, 1971
- The structure of vitreous silicaJournal of Applied Crystallography, 1969