Thermal conductivity of CaSiO3 perovskite at lower mantle conditions

Zhang, Zhen; Zhang, Dong-Bo; Onga, Kotaro; Hasegawa, Akira; Ohta, Kenji; Hirose, Kei; Wentzcovitch, Renata M.

doi:10.1103/physrevb.104.184101

Thermal conductivity of ${CaSiO}_{3}$ perovskite at lower mantle conditions

Journal Article · Thu Nov 04 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.184101· OSTI ID:1979678

Zhang, Zhen ^[1]; Zhang, Dong-Bo ^[2]; Onga, Kotaro ^[3]; Hasegawa, Akira ^[4]; ^[3]; ^[5]; ^[6]

Columbia Univ., New York, NY (United States); OSTI
Beijing Normal University (China); Beijing Computational Science Research Center (China)
Tokyo Institute of Technology (Japan)
Tokyo Institute of Technology (Japan); National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
Univ. of Tokyo (Japan). Dept. of Physics; Tokyo Institute of Technology (Japan)
Columbia Univ., New York, NY (United States). Lamont-Doherty Earth Observatory

Thermal conductivity (κ) of mantle minerals is key to understanding dynamics in the deep Earth. It controls the style of mantle convection and the timescale of cooling both the mantle and the core. Cubic CaSiO₃ perovskite (CaPv) is the third most abundant mineral in the lower mantle (7 vol %). Despite its importance, no theoretical or experimental estimate of CaPv's κ is available. Theoretical investigations of its properties are challenging because of its strong anharmonicity. Experimental measurements at relevant pressures and temperatures are equally challenging. Here we present ab initio results for CaPv's κ obtained using the phonon quasiparticle approach to address its strong anharmonicity. We also offer experimental measurements of κ up to 67 GPa and 1950 K. Predictions and measurements are in good agreement and reveal a surprisingly large κ for cubic CaPv that can be explained on the basis of its high crystal structure symmetry. Despite its relatively low abundance, CaPv's κ increases the lower mantle κ by ~10 %, if accounted for. κ of mantle regions enriched in subducted crustal materials will be more strongly impacted.

View Accepted Manuscript (DOE)

Research Organization:: Columbia Univ., New York, NY (United States)

Sponsoring Organization:: Japan Society for the Promotion of Science (JSPS) (KAKENHI); National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0019759

OSTI ID:: 1979678

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 104; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Thermal conductivity of CaSiO3 perovskite at lower mantle conditions

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Thermal conductivity of ${CaSiO}_{3}$ perovskite at lower mantle conditions