Composition and pressure dependence of lattice thermal conductivity of (Mg,Fe)O solid solutions

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Comptes Rendus Geoscience Pub Date : 2019-02-01 DOI:10.1016/j.crte.2018.10.005

Akira Hasegawa , Kenji Ohta , Takashi Yagi , Kei Hirose , Yoshiyuki Okuda , Tadashi Kondo

引用次数: 4

Abstract

We measured the lattice thermal conductivities of Fe_0.98O wüstite and iron-rich (Mg,Fe)O magnesiowüstite using the pulsed light heating thermoreflectance technique with a diamond anvil cell up to 61 GPa at 300 K. We found that the thermal conductivity of wüstite does not show a monotonic increase as a function of pressure, contrary to that of MgO periclase. Rocksalt (B1) to rhombohedral B1 transition is likely to induce an abnormal pressure response in the conductivity of wüstite. Our results also show that magnesiowüstite has a lower conductivity than that of MgO and FeO endmembers due to a strong iron impurity effect, which is well reproduced by a model considering phonon-impurity scattering in a binary solid solution.

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（Mg，Fe）O固溶体的组成和晶格热导率的压力依赖性

利用脉冲光加热热反射技术，在300 K下测量了Fe0.98O w和富铁(Mg,Fe)O镁合金的晶格热导率。我们发现w石的热导率不表现为压力的单调增加，与MgO方长石相反。岩盐(B1)到菱形B1的转变可能会导致石的电导率产生异常的压力响应。我们的研究结果还表明，由于强烈的铁杂质效应，镁石的电导率比MgO和FeO端元低，这可以通过考虑二元固溶体中声子杂质散射的模型很好地再现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Comptes Rendus Geoscience 地学-地球科学综合

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

5.9 weeks

期刊介绍： Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.