Phase transition in MgSiO3 perovskite in the earth's lower mantle

Details Phase transition in MgSiO3 perovskite in the earth's lower mantle Phase transition in MgSiO3 perovskite in the earth's lower mantle

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.224..241t&link_type=abstract

Earth and Planetary Science Letters, Volume 224, Issue 3-4, p. 241-248.

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168

Post-Perovskite, Mgsio3, First Principle, Core-Mantle Boundary, Dá Layer

Scientific paper

A new polymorph of MgSiO3 more stable than the Pbnm-perovskite phase has been identified by first-principles computations. It has the CaIrO3 structure with Cmcm symmetry and consists of SiO3 layers intercalated by eightfold-coordinated Mg ions. High-temperature calculations within the quasiharmonic approximation give a volume change of ~1.5% and a Clapeyron slope of ~7.5+/-0.3 MPa/K at ~2750 K and ~125 GPa. These pressure-temperature (P-T) conditions are close to those in which a phase transition in MgSiO3-perovskite has been observed by in situ angle dispersive X-ray diffraction measurements. This transition appears to be associated with the Dá discontinuity.

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