Lattice thermal conductivity of Mg2SiO4 olivine and its polymorphs under extreme conditions

被引：1

作者：

Yang, Shu ^{[1
]}

Dong, Wenxin ^{[1
]}

Zhang, Li ^{[1
]}

He, Kaihua ^{[1
]}

Dai, Wei ^{[2
]}

Lu, Chen ^{[1
]}

机构：

[1] China Univ Geosci, Fac Maths & Phys, 388 Lumo Rd, Wuhan 430074, Peoples R China

[2] Jingchu Univ Technol, Sch Math & Phys, 33 Xiangshan Ave, Jinmen 448000, Peoples R China

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 2023年 / 50卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Lattice thermal conductivity; Mg2SiO4; Structural phase transition; Anisotropy; First principles calculations; SINGLE-CRYSTAL ELASTICITY; FE-BEARING WADSLEYITE; LOWER-MANTLE; SOUND VELOCITIES; HEAT-TRANSFER; DISCONTINUITY; RINGWOODITE; DIFFUSIVITY; PRESSURES; WATER;

D O I：

10.1007/s00269-023-01240-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermal transport properties of minerals at high temperature and high pressure are important for understanding the internal evolution and dynamic processes of the Earth. Here, we carry out a detailed study on the lattice thermal conductivities (xlatt) of Mg(2)SiO(4 )under upper mantle and transition zone conditions by anharmonic lattice dynamics method. The calculations show that the K-latt of Mg2SiO4 increase with the phase transitions, which agree with the previous measurements and are attributed to the increase of lifetime and group velocity under extreme conditions. The K-latt of Mg(2)SiO(4 )along the geotherm shows a 64% jump at 410 km and 71% jump at 520 km . The anisotropy in the K-latt of olivine and wadsleyite decreases with increasing pressure. The present findings offer a fundamental knowledge of the xlatt of Mg2SiO4 under extreme conditions, which are crucially important for understanding the thermal transport processes in the Earth.

引用

页数：9

共 62 条

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