High temperature elastic anisotropy of the perovskite and post-perovskite polymorphs of Al2O3

Details High temperature elastic anisotropy of the perovskite and post-perovskite polymorphs of Al2O3 High temperature elastic anisotropy of the perovskite and post-perovskite polymorphs of Al2O3

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3213305s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 13, CiteID L13305

Physics

10

Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineral Physics: Elasticity And Anelasticity, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

Finite temperature ab initio molecular dynamics calculations were performed to determine the high temperature elastic and seismic properties of the perovskite and post-perovskite phases of pure end-member Al2O3. The post-perovskite phase exhibits very large degrees of shear-wave splitting. The incorporation of a few mole percent of Al2O3 into MgSiO3 is predicted to have little effect on the perovskite to post-perovskite phase transition pressure and seismic properties of the post-perovskite phase; although a small difference in shear-wave splitting may be observable.

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