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Title: Ab initio anharmonic thermodynamic properties of cubic Ca Si O 3 perovskite

Journal Article · · Physical Review. B
 [1]; ORCiD logo [2]
  1. Columbia Univ., New York, NY (United States)
  2. Columbia Univ., New York, NY (United States); Columbia Univ., Palisades, NY (United States)

We present an ab initio study of the thermodynamic properties of cubic CaSiO3 perovskite (CaPv) over the pressure and temperature range of the Earth's lower mantle. We compute the anharmonic phonon dispersions throughout the Brillouin zone by utilizing the phonon quasiparticle approach, which characterizes the intrinsic temperature dependence of phonon frequencies and, in principle, captures full anharmonicity. Such temperature-dependent phonon dispersions are used to calculate ab initio free energy in the thermodynamic limit (N → ∞) within the framework of the phonon gas model. Accurate free energy calculations enable us to investigate cubic CaPv's thermodynamic properties, e.g., thermal expansivity, Grüneisen parameter, bulk modulus, heat capacity and thermal equation of state, where anharmonic effects are demonstrated. Furthermore, the present methodology provides an important theoretical approach for exploring phase boundaries, thermodynamic, and thermoelastic properties of strongly anharmonic materials at high pressures and temperatures.

Research Organization:
Columbia Univ., New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
SC0019759; EAR-1918126; ACI-1548562; ACI-1134872
OSTI ID:
1853388
Journal Information:
Physical Review. B, Vol. 103, Issue 10; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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