High-Pressure Framework Silicates
- 21 June 1996
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 272 (5269) , 1769-1771
- https://doi.org/10.1126/science.272.5269.1769
Abstract
Recent syntheses of high-pressure alkali and alkaline earth silicates reveal a class of framework structures with corner-linked 4- and 6-coordinated silicon. These compounds possess the structural formula (A1+4−2xB2+x)SiVIm(SiIVnO2(m+n)+2), where x, m, and n specify the amounts of alkaline earth, 6-coordinated silicon, and 4-coordinated silicon, respectively. Appropriate values of m and n yield a range of high-pressure structures, from fully 4-coordinated to fully 6-coordinated silicate frameworks. Recognition of this class of framework silicates leads to predictions of high-pressure structures as well as room-pressure isomorphs of high-pressure silicates.Keywords
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