New silicate perovskites

Details New silicate perovskites New silicate perovskites

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14.1079l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Nov. 1987, p. 1079-1082.

Physics

21

Crystal Structure, Earth Mantle, Perovskites, Silicates, Glass, Lattice Parameters, Phase Diagrams

Scientific paper

In situ experiments using a gasketed diamond-anvil cell coupled with laser heating have demonstrated crystallization of the nonquenchable phases of diopside, omphacite, and diopside-II in the cubic perovskite structure at pressures greater than about 230 mbar and at temperature of about 1000 C. The lattice parameter for the perovskite phase of Ca(0.5)Mg(0.5)-SiO3 is shown to be a = 3.437 + or - 0.004 A in the 230-245 mbar pressure range at room temperature. Results suggest that Diopside-II may be the host of both Ca and Na in the lower mantle.

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