具有立方结构的过氧化物 MgSiO3 在极端条件下的热力学性质

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER The European Physical Journal B Pub Date : 2024-10-29 DOI:10.1140/epjb/s10051-024-00804-2

Hoc Quang Nguyen, Nhi Quynh Nguyen, Mai Thi Dao, Vien Cong Tran, Tra Thi Thu Lai, Anh Thi Van Le, An Thi Thuy Nguyen

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摘要

文章应用统计矩法（SMM）建立的热力学理论，数值测定了氧化镁包晶在温度 0 至 4000 K 和压力 0 至 135 GPa 范围内的热膨胀系数、热容恒压和格鲁尼森参数的温度和压力相关性。我们对 MgSiO3 包晶的 SMM 数值结果与 CaSiO3 包晶、实验数据和其他方法计算的结果进行了比较。我们的 SMM 数值结果是新的，并能预测实验结果。这是首次应用 SMM 研究地球下地幔极端条件下立方氧化镁包晶的热力学特性。

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Thermodynamic properties of perovskite MgSiO3 with cubic structure under extreme conditions

The article applies the thermodynamic theory built by statistical moment method (SMM) to determine numerically the temperature and pressure dependences of the thermal expansion coefficient, the heat capacity constant pressure and the Gruneisen parameter of MgSiO₃ perovskite in the temperature range from 0 to 4000 K and in the pressure range from 0 to 135 GPa. Our SMM numerical results for MgSiO₃ perovskite are compared with that for CaSiO₃ perovskite, experimental data and results calculated by other methods. Our SMM numerical results are new and predictive of experimental results. This is the first application of SMM to study the thermodynamic characteristics of cubic MgSiO₃ perovskite under extreme conditions of the Earth’s lower mantle.