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Ab initio lattice thermal conductivity of MgSi O3 across the perovskite-postperovskite phase transition

Journal Article · · Physical Review. B
 [1];  [2]
  1. Columbia Univ., New York, NY (United States); OSTI
  2. Columbia Univ., New York, NY (United States); Columbia Univ., Palisades, NY (United States)
Lattice thermal conductivity (κlat) of MgSiO3 postperovskite (MgPPv) under the Earth's lower mantle high pressure-temperature conditions is studied using the phonon quasiparticle approach by combing ab initio molecular dynamics and lattice dynamics simulations. Phonon lifetimes are extracted from the phonon quasiparticle calculations, and the phonon group velocities are computed from the anharmonic phonon dispersions, which, in principle, capture full anharmonicity. Here, it is found that throughout the lowermost mantle, including the D” region, κlat of MgPPv is ~25% larger than that of MgSiO3 perovskite (MgPv), mainly due to MgPPv's higher phonon velocities. Such a difference in phonon velocities between the two phases originates in the MgPPv's relatively smaller primitive cell. Systematic results of temperature and pressure dependences of both MgPPv's and MgPv's κlat are demonstrated.
Research Organization:
Columbia Univ., New York, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0019759
OSTI ID:
1853390
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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