Computer Science
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..200l&link_type=abstract
Earth and Planetary Science Letters, Volume 31, Issue 2, p. 200-208.
Computer Science
14
Scientific paper
The high-pressure and temperature phase transformations of MgSiO3 have been investigated in a diamond-anvil cell coupled with laser heating from 150 to 300 kbar at 1000-1400°C. X-ray diffraction study of the quenched samples reveals that the sequence of phase transformations for this compound is clinoenstatite --> β-Mg2SiO4 plus stishovite --> Mg2SiO4(spinel) plus stishovite --> ilmenite phase --> perovskite phase with increasing pressure. The hexagonal form of MgSiO3 observed by Kawai et al. is demonstrated to have the ilmenite structure and the ``hexagonal form'' of MgSiO3 observed by Ming and Bassett is shown to be predominantly the orthorhombic perovskite phase plus the ilmenite phase. The mixture of oxides, periclase plus stishovite, reported by Ming and Bassett was not observed in this study. The very wide stability field for the ilmenite phase of MgSiO3 found in this study suggests that this phase is of importance in connection with the observed rapid increase of velocity in the transition zone of the earth's mantle. On the basis of the extremely dense-packed structure of the perovskite phase of MgSiO3, this phase should be the most important component for the lower mantle.
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