Characterization of local atomic environment and quantitative determination of changes in site occupancies during the formation of ordered synthetic cordierite by 29Si and 27Al magic-angle spinning n.m.r. spectroscopy
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 10,p. 556-558
- https://doi.org/10.1039/c39830000556
Abstract
Eight distinct tetrahedral sites for silicon can be identified and assigned in freshly crystallized (hexagonal) synthetic cordierite, Mg2Al4Si5O18, four in the chain manifold and four in the six-membered aluminosilicate rings, but there are only two sites (one in the rings, the other in the chains) in the aged (orthorhombic) product; Si:Al ratios within each manifold can be determined from the 29Si magic-angle spinning n.m.r. spectra which also permit the course of Si, Al ordering to be charted as thermodynamic equilibrium is approached.Keywords
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