高圧下における鉄-硫黄系の相平衡・融解関係 : 地球核への適用  [in Japanese] Phase and Melting Relationships in the Fe-S System under High Pressures : Application to the Temperature Profile in the Core  [in Japanese]

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Author(s)

    • 鎌田 誠司 KAMADA Seiji
    • 東北大学大学院 理学研究科 地学専攻 Department of Earth Science, Graduate School of Sciences, Tohoku University
    • 境 毅 SAKAI Takeshi
    • 東北大学 国際高等研究教育機構 国際高等融合領域研究所 Institute for International Advanced Interdisciplinary Research, Tohoku University International Advanced Research and Education Organization

Abstract

  The Earth's core has been considered to contain light elements, and sulfur, in particular, is one of the most plausible light elements. Knowledge of the melting relationships of the iron-sulfide system is thus essential in understanding of the physical and chemical properties of the core. <i>In situ</i> X-ray diffraction experiments in the Fe-Fe<sub>3</sub>S system were performed up to 220 GPa and 3300 K using a laser-heated diamond anvil cell. Hcp Fe and Fe<sub>3</sub>S coexisted stably up to 220 GPa and 3300 K. Both phases are therefore candidates of the constitution of the inner core. The solid iron (hcp Fe) contained 7.5 at% of sulfur at 126 GPa and 2370 K. This suggests that the inner core might be able to contain significant amount of sulfur. Our results revealed that the eutectic composition becomes nonsensitive to pressure. This is likely that the eutectic composition becomes to be constant around 20 at% of sulfur at pressures above 40 GPa.<br>

Journal

  • The Review of High Pressure Science and Technology

    The Review of High Pressure Science and Technology 21(2), 77-83, 2011-05-20

    The Japan Society of High Pressure Science and Technology

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Codes

  • NII Article ID (NAID)
    10029541367
  • NII NACSIS-CAT ID (NCID)
    AN10452913
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0917639X
  • NDL Article ID
    11206552
  • NDL Source Classification
    ZP1(科学技術--化学・化学工業)
  • NDL Call No.
    Z17-1589
  • Data Source
    CJP  NDL  J-STAGE 
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