Work

Pressure Effects on the Thermodynamic Properties of MgSiO3 Akimotoite

Year: 2024

Type: article

Abstract: The thermodynamic properties of MgSiO3 akimotoite at high temperatures and high pressures are important for investigating the phase equilibria of the Earth’s transition zone and the upper part of the lower mantle. In this paper, we present the self-consistent unit-cell volume, elastic properties, and in particular, thermodynamic properties including thermal expansion, heat capacity, entropy, and Grüneisen parameter of MgSiO3 akimotoite at pressures up to 30 GPa and temperatures to 2000 K using an iterative numerical method and available experimental data, which are consistent with the previous studies. The results show that the determined thermal expansion, heat capacity, entropy, and Grüneisen parameter exhibit a nonlinear and negative relationship with increasing pressure. Additionally, the pressure derivatives of these thermodynamic parameters along with the temperature are also presented.

Source: Crystals

DOI: 10.3390/cryst14100837

Authors: Chang Su, Wei Song, Guang Yang, Yonggang Liu, Qingyi Li

Institutions: Chinese Academy of Sciences, Institute of Disaster Prevention, Institute of Geochemistry

Language: English

Topic: High-pressure geophysics and materials

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,955

Funders: National Natural Science Foundation of China, Natural Science Foundation of Hebei Province, Fundamental Research Funds for the Central Universities