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Geophysical Research Letters

Decomposition of Fe3S above 250 GPa

Authors

  • Haruka Ozawa,

    Corresponding author
    1. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan
    2. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, Japan
    3. Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, Japan
    • Corresponding author: H. Ozawa, Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan. (h-ozawa@jamstec.go.jp)

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  • Kei Hirose,

    1. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan
    2. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, Japan
    3. Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, Japan
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  • Toshihiro Suzuki,

    1. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan
    2. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, Japan
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  • Yasuo Ohishi,

    1. Japan Synchrotron Radiation Research Institute, Sayo-cho, Hyogo, Japan
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  • Naohisa Hirao

    1. Japan Synchrotron Radiation Research Institute, Sayo-cho, Hyogo, Japan
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Abstract

[1] We have determined subsolidus phase relations in the Fe–FeS system up to 271 GPa using laser-heated diamond-anvil cell techniques. In situ synchrotron X-ray diffraction (XRD) measurements performed at high pressure and high temperature demonstrate the coexistence of hexagonal close-packed (hcp) Fe and tetragonal Fe3S up to 241 GPa and 2510 K. In contrast, the XRD data obtained above 250 GPa show that the hcp phase coexists with the CsCl (B2)-type phase for three different Fe–S bulk compositions (10, 16, and 20 atm% S). Furthermore, chemical analyses using a scanning transmission electron microscope on a retrieved sample indicate that Fe3S sample decomposes into two phases at 271 GPa and 2530 K, consistent with the XRD data. Theory predicts the presence of extensive solid solution between Fe and FeS at inner core conditions, whereas our results suggest that the Fe–FeS system remains eutectic at least to 271 GPa.

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