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Measurements of melting temperatures of ice and ammonia in the Mbar regime

Research Project

Project/Area Number 16K05612
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionEhime University (2017-2018)
Tohoku University (2016)

Principal Investigator

Kimura Tomoaki  愛媛大学, 地球深部ダイナミクス研究センター, 特別研究員 (50624540)

Research Collaborator Murakami Motohiko  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsアンモニア / 融解 / 超イオン / 天王星 / 海王星 / ブリュアン散乱分光計測 / 水 / ブリュュアン散乱 / 氷 / ブリュアン散乱分光法 / ラマン散乱分光法 / 高温高圧実験 / ブリルアン散乱 / ラマン散乱 / 惑星内部構造 / 物性実験 / 高圧物性 / 惑星内部磁場
Outline of Final Research Achievements

We have developed Brillouin-Raman scattering spectroscopy combined with CO2 laser heating system and measured sound velocity and Raman spectra of ammonia under high pressure and temperature conditions corresponding to the planetary interiors. The melting temperatures of ammonia have been determined up to 60 GPa based on the observation of the Brillouin peaks derived from the sound velocity of the liquid phase. We found the superionic phase at 2000 K more than 40 GPa, which is ionized solid with the anomalously low sound velocity. The low sound velocity of the superionic ammonia, which is comparable to that of the liquid, suggested that the superionic components does not contribute on the suppression of the mantle convection.

Academic Significance and Societal Importance of the Research Achievements

天王星と海王星の惑星磁場は多重極磁場であることが知られているがその磁場生成メカニズムは明らかになっていなかった。惑星深部の対流が抑制される内部構造が磁場生成に関与していることが提案されているが、そのような非対流層が形成される原因は未解明である。本研究でアンモニアの超イオン相の弾性波速度の実験計測に初めて成功した。計測した超イオン相の弾性波速度は液体と同等であることが明らかになり、惑星深部の非対流層を形成する要因として提案されていた超イオン物質は対流の抑制に寄与していないことがわかった。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (20 results)

All 2018 2017 2016 Other

All Int'l Joint Research (1 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (10 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results) Remarks (5 results)

  • [Int'l Joint Research] ETH Zurich(スイス)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Application of Laser Technology for Static and Dynamic Compression Experiments2018

    • Author(s)
      KIMURA Tomoaki
    • Journal Title

      The Review of High Pressure Science and Technology

      Volume: 28 Issue: 2 Pages: 131-138

    • DOI

      10.4131/jshpreview.28.131

    • NAID

      130007402264

    • ISSN
      0917-639X, 1348-1940
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Melting temperatures of MgO under high pressure by micro-texture analysis2017

    • Author(s)
      T. Kimura, H. Ohfuji, M. Nishi, T. Irifune
    • Journal Title

      Nature Communications

      Volume: 8 Issue: 1 Pages: 15735-15735

    • DOI

      10.1038/ncomms15735

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Shock Compression Response of Forsterite above 250 Gpa2016

    • Author(s)
      T. Sekine, N. Ozaki, Y.Asaumi, T. Kimura, K. Miyanishi, B. Albertazzi, Y. Sato,Y. Sakawa, T.Sano, S. Sugita, T. Matsui, and R. Kodama
    • Journal Title

      Sci. Adv.

      Volume: 2(8) Issue: 8 Pages: 31600157-31600157

    • DOI

      10.1126/sciadv.1600157

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dynamic compression of dense oxide (Gd3Ga5O12) from 0.4 to 2.6 TPa: Universal Hugoniot of fluid metals2016

    • Author(s)
      N. Ozaki, W. J. Nellis, T. Mashimo, M. Ramzan, R. Ahuja, T. Kaewmaraya, T. Kimura, M. Knudson, K. Miyanishi, Y. Sakawa, T. Sano, and R. Kodama
    • Journal Title

      Sci. Rep.

      Volume: 6, Issue: 1 Pages: 26000-26000

    • DOI

      10.1038/srep26000

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] CO2レーザーと組み合わせたブリュアンーラマン散乱分光システム2018

    • Author(s)
      木村友亮、村上元彦
    • Organizer
      第59回高圧討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 両側CO2レーザー加熱システムを用いたMgOの高圧融点決定2018

    • Author(s)
      木村友亮
    • Organizer
      光・量子ビーム科学合同シンポジウム
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Melting temperatures of MgO up to ~50 GPa determined by micro-texture analysis2017

    • Author(s)
      Tomoaki Kimura, Hiroaki Ohfuji, Masayuki Nishi, Tetsuo Irifune
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Place of Presentation
      幕張メッセ
    • Year and Date
      2017-05-20
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Melting temperatures of MgO up to ~50 GPa determined by micro-texture analysis2017

    • Author(s)
      T. Kimura, H. Ohfuji, M. Nishi, T. Irifune
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Melting temperatures of MgO up to ~50 GPa by micro-texture analysis2017

    • Author(s)
      T. Kimura, H. Ohfuji, M. Nishi, T. Irifune
    • Organizer
      International Joint Graduate Program Workshop in Earth and Environmental Science
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] レーザー技術の静・動的圧縮実験への応用2017

    • Author(s)
      木村友亮
    • Organizer
      第58回高圧討論会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 超イオンNH3で形成される天王星と海王星の安定成層2017

    • Author(s)
      木村友亮、村上元彦
    • Organizer
      第58回高圧討論会
    • Related Report
      2017 Research-status Report
  • [Presentation] Melting temperatures of MgO under high pressure determined by micro-texture observantion2016

    • Author(s)
      Tomoaki Kimura, Hiroaki Ohfuji, Masayuki Nishi, Tetsuo Irifune
    • Organizer
      AGU fall meeting 2016
    • Place of Presentation
      San Francisco
    • Year and Date
      2016-12-12
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Melting curve of MgO under high pressure constrained by micro-texture observantion2016

    • Author(s)
      Tomoaki Kimura
    • Organizer
      Gordon Research Seminar
    • Place of Presentation
      Holderness School
    • Year and Date
      2016-07-16
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 高圧下のタンタル(Ta)の融解直前の構造と融点の決定2016

    • Author(s)
      木村友亮
    • Organizer
      レーザー研シンポジウム
    • Place of Presentation
      大阪大学 吹田キャンパス
    • Year and Date
      2016-04-19
    • Related Report
      2016 Research-status Report
  • [Remarks] Experimental Mineral Physics, ETH Zurich

    • URL

      http://mineralphysics.ethz.ch/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 愛媛大学 地球深部ダイナミクス研究センター

    • URL

      http://grc.ehime-u.ac.jp/

    • Related Report
      2018 Annual Research Report
  • [Remarks] CO2レーザー加熱DACを用いたMgO融点精密決定に成功

    • URL

      http://www.grc.ehime-u.ac.jp/archives/2258

    • Related Report
      2017 Research-status Report
  • [Remarks] 地球のマントルはどのようにしてできたのか?

    • URL

      https://academist-cf.com/journal/?p=5437

    • Related Report
      2017 Research-status Report
  • [Remarks] 木村友亮さんと柿澤翔さんが高圧討論会で受賞

    • URL

      http://www.grc.ehime-u.ac.jp/archives/2908

    • Related Report
      2017 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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