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Structures and stability of ABO(3) orthorhombic perovskites at the Earth's mantle conditions from first-principles theory
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
2006 (English)In: Physics of the Earth and Planetary Interiors, ISSN 0031-9201, E-ISSN 1872-7395, Vol. 157, no 1-2, 1-7 p.Article in journal (Refereed) Published
Abstract [en]

We report first-principles calculations on the structures and stabilities of the ABO(3) (A = Mg and Ca; B = Si and Ge) orthorhombic perovskites (OPvs) under high pressures. Calculations have also been performed for CdGeO3 and CdTiO3 OPvs. The calculations showed that MgSiO3, MgGeO3, CaGeO3, CdGeO3 and CdTiO3 OPvs transform to the orthorhombic post-perovskites (OPPvs) at about 10 1, 47, 55, 78 and 64 GPa, respectively, while CaSiO3 OPv is stable under high pressures. The theoretical results are in good agreement with the available experiments. The lattice distortions with pressure have been studied by analyzing the lattice deviations from the corresponding cubic perovskite (CPv). The lattice distortions increase with pressure for MgSiO3, MgGeO3, CaGeO3 and CdTiO3 OPvs, while CaSiO3 OPv has very small lattice distortions under high-pressures and the lattice distortions of CdGeO3 OPV even decrease with increasing pressure. The OPPvs have large distortions for the a-axis (about -10%).

Place, publisher, year, edition, pages
2006. Vol. 157, no 1-2, 1-7 p.
Keyword [en]
ABO(3)-perovskite and post-perovskite, ab initio method, phase transition, crystal chemistry
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-155681DOI: 10.1016/j.pepi.2006.02.007ISI: 000239474200001OAI: oai:DiVA.org:uu-155681DiVA: diva2:427589
Available from: 2011-06-28 Created: 2011-06-28 Last updated: 2017-12-11Bibliographically approved

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Ahuja, Rajeev

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