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Lattice Thermal Conductivity of MgSiO3 Perovskite and Post-Perovskite under Lower Mantle Conditions Calculated by Deep Potential Molecular Dynamics

  • Received Date: September 18, 2022
  • Published Date: October 31, 2022
  • Lattice thermal conductivity (κlat) of MgSiO3 perovskite and post-perovskite is an important parameter for the thermal dynamics in the Earth. Here, we develop a deep potential of density functional theory quality under entire thermodynamic conditions in the lower mantle, and calculate the κlat by the Green–Kubo relation. Deep potential molecular dynamics captures full-order anharmonicity and considers ill-defined phonons in low-κlat materials ignored in the phonon gas model. The κlat shows negative temperature dependence and positive linear pressure dependence. Interestingly, the κlat undergos an increase at the phase boundary from perovskite to post-perovskite. We demonstrate that, along the geotherm, the κlat increases by 18.2% at the phase boundary. Our results would be helpful for evaluating Earth's thermal dynamics and improving the Earth model.
  • Article Text

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