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2011 Fiscal Year Final Research Report

Study on atomic diffusion process promoted by hydrogen absorption measured by time domain analysis of nuclear resonant X-ray scattering

Research Project

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Project/Area Number 21360019
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionThe University of Tokyo

Principal Investigator

OKANO Tatsuo  東京大学, 生産技術研究所, 教授 (60011219)

Project Period (FY) 2009 – 2011
Keywords放射光 / 原子拡散 / 鉄 / 核共鳴X線散乱 / 水素
Research Abstract

One of the general properties of Metal-Hydrogen system is formation of superabundant vacancies and enhancement of atomic diffusion by many orders of magnitude in some cases. Such phenomena are extensively investigated for Pd, Cu, Ni. However, experimental investigation for Fe is very few. Main object of our research is to elucidate atom diffusion mechanisms under high hydrogen pressures by using nuclear resonant forward scattering(NRFS) of X-rays combined with high pressure techniques. In the experiment、atomic diffusion in 4μm thick 57Fe foil was investigated for temperatures between RT and 1000℃under hydrogen pressures up to 2. 8GPa.
Detailed analysis of experimental data is still under way. The followings are the tentative conclusions of this research project.
(1) Internal magnetic field of iron foil was measured by Zeeman splitting of hyperfine states. At hydrogen pressure of 2. 8GPa, the internal field disappeared above 640℃. It was concluded that it demonstrated the lowering ofα-γstructural phase transition temperature by hydrogen absorption.
(2) It was observe at temperature 960℃that significant change in time spectrum of nuclear resonant forward X-ray scattering took place. We concluded that this abrupt change was due to the lowering of melting point of Fe foil with abundant hydrogen absorption.
(3) No enhancement of atomic diffusion by hydrogen absorption was observed for the present experimental condition : Temperatures from RT and 1000℃and hydrogen pressure 2. 8GPa. Main reason for this absence of hydrogen effect is vacancy diffusion mechanism was surpassed by much faster diffusion process such as surface diffusion or subsurface diffusion. It illustrates the importance of surface phenomena in atomic transportation in polycrystalline materials.

  • Research Products

    (4 results)

All 2012 2011

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results)

  • [Journal Article] Surface magnetic canting of ion films2011

    • Author(s)
      T. Kawauchi, K. Fukutani, M. Matsumoto, K. Oda, T. Okano, X. W. Zhang, Y. Yoda
    • Journal Title

      Phys. Rev. B

      Volume: 84 Pages: 200415

    • Peer Reviewed
  • [Presentation] 核共鳴X線前方散乱を用いた高水素圧力下のFeの原子拡散と磁性の研究2012

    • Author(s)
      笠井秀隆,河内泰三,深井有,張小威,岸本俊二,亀掛川卓美,依田芳卓,大谷栄治,松本益明,岡野達雄
    • Organizer
      日本物理学会
    • Place of Presentation
      関西学院大学
    • Year and Date
      2012-03-24
  • [Presentation] Application of Nuclear Resonant X-ray Forward Scattering to the study of Diffusion of Iron Atoms under Hydrogen Pressure of GPa range2011

    • Author(s)
      K. Kasai, T. Kawauchi, Y. Fukai, X. W. Zhang, S. Kishimoto, T. Kikegawa, Y. Yoda, E. Ohtani, T. Okano
    • Organizer
      ICAME 2011
    • Place of Presentation
      神戸国際会議場
    • Year and Date
      2011-09-29
  • [Presentation] 核共鳴X線散乱時間スペクトルによる水素誘起原子拡散の研究III2011

    • Author(s)
      笠井秀隆,河内泰三,深井有,張小威,岸本俊二,亀卦川卓美,依田芳卓,大谷栄治,岡野達雄
    • Organizer
      日本物理学会2010年秋季大会
    • Place of Presentation
      大阪府立大学
    • Year and Date
      2011-09-23

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Published: 2013-07-31  

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