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High-pressure study of hydrogen in iron: implication for the Earth's core

Research Project

Project/Area Number 25871243
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Petrology/Mineralogy/Economic geology
Solid earth and planetary physics
Research InstitutionJapan Synchrotron Radiation Research Institute

Principal Investigator

HIRAO Naohisa  公益財団法人高輝度光科学研究センター, 利用研究促進部門, 研究員 (70374915)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords地球核 / 高温高圧 / 鉄水素化物 / 放射光 / X線回折
Outline of Final Research Achievements

Hydrogen in the Earth's core is believed to have a key role in the structure and dynamics of Earth's core. However, the behavior of hydrogen in the core and its abundance remain an open question. For the purpose of elucidate the crystal structure, phase relation, and properties of iron-hydrogen system under high-pressure and high-temperature conditions corresponding to the Earth's core, we have upgraded and established high-pressure and high-temperature in-situ powder X-ray diffraction techniques for metal-hydrogen system. A structural phase transition into a new high-pressure phase was confirmed above 85 GPa and 1500 K. Because the abundance of hydrogen in the Earth's core was based on prossible stability of double-hexagonal-close-packed structure under the Earth's core conditions, the discovery of the new phase gives a new model for hydrogen in the Earth's core.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (12 results)

All 2015 2014 2013

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (7 results)

  • [Journal Article] Heating of Li in hydrogen : possible synthesis of LiHx2015

    • Author(s)
      K. Kuno, T. Matsuoka, T. Nakagawa, N. Hirao, Y. Ohishi, K. Shimizu, K. Takahama, K. Ohta, M. Sakata, T. Kume, S. Sasaki
    • Journal Title

      High Pressure Research

      Volume: 35 Issue: 1 Pages: 16-21

    • DOI

      10.1080/08957959.2014.999677

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Equation of state of pure iron and FeO.9NiO.1 alloy up to 3 Mbar2014

    • Author(s)
      Takeshi Sakai, Suguru Takahashi, Naoya Nishitani, Izumi Mashino, Eiji Ohtani, Naohisa Hirao
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 228 Pages: 114-126

    • DOI

      10.1016/j.pepi.2013.12.010

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Equation of state of Fe3S at room temperature up to 2 megabars2014

    • Author(s)
      Kamada S., Ohtani E., Terasaki H., Sakai T., Takahashi S., Hirao N., Ohishi Y.
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 228 Pages: 106-113

    • DOI

      10.1016/j.pepi.2013.11.001

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] In-situ synchrotron 57Fe Mössbauer spectroscopy of RFe2 (R=Y, Gd) hydrides synthesized under ultra-high hydrogen pressure2013

    • Author(s)
      T. Mitsui, R. Masuda, M. Seto, N. Hirao, T. Matsuoka, Y. Nakamura, K. Sakaki
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 580 Pages: S264-S267

    • DOI

      10.1016/j.jallcom.2013.03.271

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Decomposition of Fe3S above 250 Gpa2013

    • Author(s)
      Ozawa, H., Hirose, K., Suzuki, T., Ohishi, Y., Hirao, N.
    • Journal Title

      Geophysical Research Letters

      Volume: 40 Issue: 18 Pages: 1-5

    • DOI

      10.1002/grl.50946

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] サブミクロンビームX線利用に向けた精密入射・回折計架台の高度化2014

    • Author(s)
      平尾直久,大石泰生
    • Organizer
      第55回高圧討論会
    • Place of Presentation
      徳島大学(徳島県徳島市)
    • Year and Date
      2014-11-22 – 2014-11-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] 高温高圧下における金属水素流体の安定領域の決定II2014

    • Author(s)
      川口翔,市丸孝太,榮永茉利,清水克哉,太田健二,平尾直久,大石泰生
    • Organizer
      第55回高圧討論会
    • Place of Presentation
      徳島大学(徳島県徳島市)
    • Year and Date
      2014-11-22 – 2014-11-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] 高温高圧における高密度水素の相転移境界2014

    • Author(s)
      榮永茉莉,川口翔,市丸孝太,清水克哉,太田健二,平尾直久,大石泰生
    • Organizer
      第12回水素量子アトミクス研究会
    • Place of Presentation
      東北大学(宮城県仙台市)
    • Year and Date
      2014-10-23 – 2014-10-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] Lithium hydride (LiHx) synthesized under HT/HP conditions2014

    • Author(s)
      K. Kuno, T. Matsuoka, T. Nakagawa, N.Hirao, Y. Ohishi, K. Shimizu, K. Takahama, K. Ohta, T. Kume, S.Sasaki
    • Organizer
      52nd European High Pressure Research Group
    • Place of Presentation
      Lyon, France
    • Year and Date
      2014-09-07 – 2014-09-12
    • Related Report
      2014 Annual Research Report
  • [Presentation] 固体水素高圧相:III相のラマン分光2014

    • Author(s)
      水木悠斗,赤浜裕一,中野智志,平尾直久,大石泰生
    • Organizer
      日本物理学会2014年秋季大会
    • Place of Presentation
      中部大学(愛知県春日井市)
    • Year and Date
      2014-09-07 – 2014-09-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] Combined system of synchrotron-based x-ray diffraction and Mossbauer spectroscopy for high pressure research at BL10XU of SPring-82014

    • Author(s)
      N. Hirao, Y. Ohishi
    • Organizer
      ESRF User's meeting: High pressure science workshop
    • Place of Presentation
      Grenoble, France
    • Related Report
      2013 Research-status Report
  • [Presentation] 高圧下における放射光X線回折・メスバウアー分光複合同時測定法の開発2013

    • Author(s)
      平尾直久, 大石泰生, 三井隆也, 浜田麻希, 松岡岳洋, 鎌田誠司, 大谷栄治
    • Organizer
      第54回高圧討論会
    • Place of Presentation
      朱鷺メッセ新潟コンベンションセンター(新潟県新潟市)
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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