极端条件下Mg2SiO4橄榄石及其多晶的晶格热导率

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shu Yang, Wenxin Dong, Li Zhang, Kaihua He, Wei Dai, Chen Lu
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引用次数: 0

摘要

矿物在高温高压下的热输运性质对认识地球内部演化和动力学过程具有重要意义。本文采用非调和晶格动力学方法对上地幔和过渡带条件下\(\text {Mg}_2\text {SiO}_4\)的晶格热导率(\({\kappa }_\text {latt}\))进行了详细的研究。计算表明,\(\text {Mg}_2\text {SiO}_4\)的\({\kappa }_\text {latt}\)值随着相变的增大而增大,这与之前的测量结果一致,这是由于极端条件下寿命和群速度的增大。沿地热方向的\(\text {Mg}_2\text {SiO}_4\)的\({\kappa }_\text {latt}\)在410 \({\textrm{km}}\)处跳跃64 \(\%\),在520 \(\textrm{km}\)处跳跃71 \(\%\)。随着压力的增加,橄榄石和瓦德斯莱石的\({\kappa }_\text {latt}\)各向异性减小。目前的发现提供了极端条件下\(\text {Mg}_2\text {SiO}_4\)的\({\kappa }_\text {latt}\)的基本知识,这对于理解地球的热传输过程至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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

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

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 (\({\kappa }_\text {latt}\)) of \(\text {Mg}_2\text {SiO}_4\) under upper mantle and transition zone conditions by anharmonic lattice dynamics method. The calculations show that the \({\kappa }_\text {latt}\) of \(\text {Mg}_2\text {SiO}_4\) 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 \({\kappa }_\text {latt}\) of \(\text {Mg}_2\text {SiO}_4\) along the geotherm shows a 64\(\%\) jump at 410 \({\textrm{km}}\) and 71\(\%\) jump at 520 \(\textrm{km}\). The anisotropy in the \({\kappa }_\text {latt}\) of olivine and wadsleyite decreases with increasing pressure. The present findings offer a fundamental knowledge of the \({\kappa }_\text {latt}\) of \(\text {Mg}_2\text {SiO}_4\) under extreme conditions, which are crucially important for understanding the thermal transport processes in the Earth.

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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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