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Measurements of magnetic properties of natural rock-forming minerals under pressure

Research Project

Project/Area Number 17540398
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionKochi University

Principal Investigator

KODAMA Kazuto  Kochi University, Center for Advanced Marine Core Research, Professor, 海洋コア総合研究センター, 教授 (00153560)

Co-Investigator(Kenkyū-buntansha) NISHIOKA Takashi  Kochi University, Dept of Material Science, Faculty of Science, Professor, 理学部, 教授 (10218117)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsAC susceptibility / ferromagnetic mineral / pressure / temperature / magnetite / Curie temperature / 磁性
Research Abstract

We have aimed to conduct a laboratory experiment for measuring alternating-current (AC) magnetic susceptibility and its temperature dependence under pressure around one GPa. For this purpose, we have developed a small, c. 70mm long, devise that consists of primary and secondary coils for measuring mutual inductance, a heater coil and a thermocouple, all of which are molded with heat-resistive cement. Then, the coil system is placed within a laboratory-made piston cylinder that can give rise to hydrostatic pressure by means of a handy, uni-axial press. We have carried out a series of experiments for characterizing magnetic behaviors of the coil system at an atmospheric pressure. We have used Nickel as a test sample and succeeded in measuring magnetic susceptibility change with temperature, whereby detecting a ferromagnetic phase transition with Tc equivalent to that of Nickel (631K). Then, we have measured fragments of a natural volcanic rock that contains pure magnetite as a sole magnetic carrier. We could detect Tc of magnetite (853K). These results show that the new coil system would be useful for not only detecting Tc, but also investigating changes in AC magnetic susceptibility with frequency. The latter could provide a new means for estimating grain size as well as identifying magnetic minerals in natural rocks. We finally carried out a series of experiments using Nickel by pressurizing at c. 10 MPa. The results appear to be successful, reproducing Tc of Nickel, but also show it still hard to make precise measurements of AC susceptibility under pressure. We should point out that a solid media should be used as a pressure transmitter, instead of BN powder used in this study, in order to avoid break-down of the coil system caused by the greater volume change of BN with the more pressurized.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (9 results)

All 2007 2005

All Journal Article (9 results)

  • [Journal Article] Determination of crystal field wave functions of Ce_xLa_<1-x>RhIn_52007

    • Author(s)
      Tokuda, N.
    • Journal Title

      Journal of Physical Society of Japan 76

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] High pressure magnetization measurements of BaNiSn_3-type CeCuAl_32007

    • Author(s)
      Nishioka, T.
    • Journal Title

      J. Magn. Magn. Mater 310

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Magnetic properties of Ce_5Si_3 single crystal under pressure2007

    • Author(s)
      Nishioka, T.
    • Journal Title

      Journal of Physical Society of Japan 76(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Determination of crystal field wave functions of Ce_xLa_<1-x>RhIn_52007

    • Author(s)
      Tokuda, N
    • Journal Title

      Journal of Physical Society of Japan 76, 10.1143/JPSJ.76.014706

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] High pressure magnetization measurements of BaNiSn_3-type CeCuAl_32007

    • Author(s)
      Nishioka, T.
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Magnetic properties of Ce_5Si_3 single crystal under pressure2007

    • Author(s)
      Nishioka, T.
    • Journal Title

      Journal of Physical Society of Japan 76(in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Determination of crystal field wave functions of Ce_XLa_<1-X>RhIn_52007

    • Author(s)
      Tokuda, N., T.Nishioka, G.F.Chen, K.Deguchi, K.Kodama, N.K.Sato
    • Journal Title

      Journal of Physical Society of Japan 76

    • Related Report
      2006 Annual Research Report
  • [Journal Article] High pressure magnetization measurements of BaNiSn_3-type CeCuAl_32007

    • Author(s)
      Nishioka, T., Y.Kawamura, H.Kato, M.Matsumura, K.Kodama, N.Sato
    • Journal Title

      J. Magn. Magn. Mater 310

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 海洋掘削と今後の古地磁気研究計画2005

    • Author(s)
      小玉一人
    • Journal Title

      地学雑誌 114

      Pages: 309-315

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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