CaSiO3 perovskite at lower mantle pressures

Details CaSiO3 perovskite at lower mantle pressures CaSiO3 perovskite at lower mantle pressures

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3206306c&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 6, CiteID L06306

Physics

18

Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineral Physics: Creep And Deformation, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: Elasticity And Anelasticity

Scientific paper

We investigate by first-principles the structural behavior of CaSiO3 perovskite up to lower mantle pressures. We confirm that the cubic perovskite modification is unstable at all pressures. The zero Kelvin structure is stabilized by SiO6 octahedral rotations that lower the symmetry to tetragonal, orthorhombic, rhombohedral, or to a cubic supercell. The resulting structures have comparable energies and equation of state parameters. This suggests that relatively small deviatoric/shear stresses might induce phase transformations between these various structures softening some elastic moduli, primarily the shear modulus. The seismic signature accompanying a local increase in CaSiO3 content should be a positive density anomaly and a negative VS anomaly.

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