Decomposition of Fe<sub>3</sub>S above 250 GPa

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  • Haruka Ozawa
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology Yokosuka Kanagawa Japan
  • Kei Hirose
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology Yokosuka Kanagawa Japan
  • Toshihiro Suzuki
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology Yokosuka Kanagawa Japan
  • Yasuo Ohishi
    Japan Synchrotron Radiation Research Institute Sayo‐cho Hyogo Japan
  • Naohisa Hirao
    Japan Synchrotron Radiation Research Institute Sayo‐cho Hyogo Japan

書誌事項

公開日
2013-09-20
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/grl.50946
公開者
American Geophysical Union (AGU)

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説明

<jats:p>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 Fe<jats:sub>3</jats:sub>S 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 Fe<jats:sub>3</jats:sub>S 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.</jats:p>

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