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Low-temperature crystal structure of CaSiO3 perovskite: An ab initio total energy study
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0003-2832-3293
KTH, Superseded Departments, Materials Science and Engineering.
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2002 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 65, no 19Article in journal (Refereed) Published
Abstract [en]

The stability of cubic CaSiO3 perovskite with respect to octahedral rotations is investigated by ab initio total-energy calculations. The proposed theoretical ground-state crystal structure has the orthorhombic Pbnm symmetry. Pressure gradually reduces the average tilting of the SiO6 octahedra relative to the cubic axis, from 7degrees at zero pressure to 4degrees at about 150 GPa. The energy difference between the orthorhombic and cubic phases at 0 GPa is 63 meV per f.u. and shows weak pressure dependence. A possible stabilization of the cubic phase at finite temperatures by entropy effects is discussed.

Place, publisher, year, edition, pages
2002. Vol. 65, no 19
Keyword [en]
earths lower mantle, tin orbitals theory, lattice-dynamics, first-principles, elastic properties, mgsio3 perovskite, stability, state, equation, phase
Identifiers
URN: urn:nbn:se:kth:diva-21580DOI: 10.1103/PhysRevB.65.193107ISI: 000175860900007OAI: oai:DiVA.org:kth-21580DiVA: diva2:340278
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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