Predicted compositions for high-density hydrous magnesium silicates

Details Predicted compositions for high-density hydrous magnesium silicates Predicted compositions for high-density hydrous magnesium silicates

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1395f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1395-1397.

Physics

15

Chemical Composition, Magnesium Compounds, Molecular Structure, Silicates, Crystal Structure, Earth Mantle, Olivine

Scientific paper

Barbier's (1987) formalism for the cation arrangements in anhydrous germanates with mixed Ge coordination is extended to hydrous systems. A formula is presented for predicting the compositions of possible phases in the MgO-SiO2-H2O system. The room pressure-temperature densities of these hypothetical materials are estimated. Consideration is given to the use of these predictions for solving the crystal structures of the phases and in the interpretation of in situ powder patterns for materials that cannot be quenched.

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