Composition and pressure dependence of lattice thermal conductivity of (Mg,Fe)O solid solutions - 09/05/19

Doi : 10.1016/j.crte.2018.10.005

Akira Hasegawa ^a,^b,^⁎ , Kenji Ohta ^a,^⁎ , Takashi Yagi ^b, Kei Hirose ^c, Yoshiyuki Okuda ^a, Tadashi Kondo ^d
^a Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 152-8551 Meguro, Tokyo, Japan
^b National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 305-8563 Tsukuba, Ibaraki, Japan
^c Earth-Life Science Institute, Tokyo Institute of Technology, 152-8550 Meguro, Tokyo, Japan
^d Department of Earth and Space Science, Osaka University, 560-0043 Toyonaka, Osaka, Japan

^⁎Corresponding author at: Corresponding authors at: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 152-8551 Meguro, Tokyo, Japan.Department of Earth and Planetary Sciences, Tokyo Institute of TechnologyMeguro, Tokyo152-8551Japan

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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 61GPa at 300K. 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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Keywords : Thermal conductivity, Wüstite, Magnesiowüstite, Pulsed light heating thermoreflectance technique, Impurity-phonon scattering

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Introduction

Materials and methods

Results and discussion

Pressure response of lattice thermal conductivity of wüstite

Lattice thermal conductivity of (Mg,Fe)O solid solutions

Geophysical implications

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Vol 351 - N° 2-3

P. 229-235 - février 2019 Retour au numéro

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Composition and pressure dependence of lattice thermal conductivity of (Mg,Fe)O solid solutions - 09/05/19

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