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Equations of state and stability of MgSiO3 perovskite and post-perovskite phases from quantum Monte Carlo simulations

Lin, Y; Cohen, RE; Stackhouse, S; Driver, KP; Militzer, B; Shulenburger, L; Kim, J; (2014) Equations of state and stability of MgSiO3 perovskite and post-perovskite phases from quantum Monte Carlo simulations. PHYSICAL REVIEW B , 90 (18) , Article ARTN 184103. 10.1103/PhysRevB.90.184103. Green open access

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Abstract

We have performed quantum Monte Carlo (QMC) simulations and density functional theory calculations to study the equations of state of MgSiO3 perovskite (Pv, bridgmanite) and post-perovskite (PPv) up to the pressure and temperature conditions of the base of Earth's lower mantle. The ground-state energies were derived using QMC simulations and the temperature-dependent Helmholtz free energies were calculated within the quasiharmonic approximation and density functional perturbation theory. The equations of state for both phases of MgSiO3 agree well with experiments, and better than those from generalized gradient approximation calculations. The Pv-PPv phase boundary calculated from our QMC equations of state is also consistent with experiments, and better than previous local density approximation calculations. We discuss the implications for double crossing of the Pv-PPv boundary in the Earth.

Type: Article
Title: Equations of state and stability of MgSiO3 perovskite and post-perovskite phases from quantum Monte Carlo simulations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.90.184103
Publisher version: http://dx.doi.org/10.1103/PhysRevB.90.184103
Language: English
Additional information: ©2014 American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1461760
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