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2001 Fiscal Year Final Research Report Summary

Material investigation on Core-Mantle Boundary

Research Project

Project/Area Number 11440156
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionTohoku University

Principal Investigator

KONDO Tadashi  Tohoku Univ., School of Sci., Associate Prof., 大学院・理学研究科, 助教授 (20252223)

Co-Investigator(Kenkyū-buntansha) KUBO Tomoaki  Tohoku Univ., School of Sci., Res. Associate, 大学院・理学研究科, 助手 (40312540)
SUZUKI Akio  Tohoku Univ., School of Sci., Res. Associate, 大学院・理学研究科, 助手 (20281975)
OHTANI Eiji  Tohoku Univ., School of Sci., Prof., 大学院・理学研究科, 教授 (60136306)
Project Period (FY) 1999 – 2001
Keywordsdiamond anvil cell / laser heating / synchrotoron / core-mantle boundary
Research Abstract

In this research, we investigated the properties on some major mantle minerals under high pressure and high temperature using an improved double-sided laser heated diamond anvil cell (LHDAC). The results of this research are followings;
(1)We newly developed a laser heating system at Tohoku University, which enable to heat the larger sample stably under pressure. The technical essences were feed backed to construction of in-situ X-ray diffraction system using LHDAC in both Photon Factory and SPring-8.
(2) The reaction between iron and silicate perovskite was examined for the pressure range of 30 - 60 GPa. A possibility of reaction which produce iron silicide was detected in the recovered sample after laser heating at 30 GPa. The texture recovered from 60 GPa and 2800 K show a percolation of molten iron into the grain boundary of silicate perovskite.
(3) High pressure and high temperature behavior of (Mg,Fe)O was examined using in-situ X-ray diffraction method with synchrotron radiation. A rhombohedral distortion was observed in all compositions. High temperature phase at around 100 GPa has rock salt structure and no NiAs-structured phase was observed except for the end member of FeO. Therefore, the stable phase under the lowermost mantle condition should have rock salt structure.
(4) Post stishovite phase of Si0_2 was examined using in-situ X-ray diffraction method. CaCl2-structured phase was observed above 55 GPa, which was stable up to 80 GPa and 2000 K. The results show that the Clausius-Clapeyron slope of this transition is slightly positive.
(5) Iron-water reaction was examined using in-situ X-ray diffraction method. The bcc iron directly reacted with water to produce iron hydrate and showed successive transition to iron hydride and wustite at higher temperature. The fcc iron reacted to produce iron hydride and wustite after laser heating. These iron hydride were unquenchable to ambient condition.

  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] 近藤忠: "ダイヤモンドアンビルセルを用いた高温高圧力実験と放射光実験の進歩"高圧力の科学と技術. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 近藤忠: "地球惑星中心核の結晶学"日本結晶学会誌. 43. 91-95 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Watanuki 他: "Construction of laser-heated diamond anvil cell system for in-situ X-ray diffraction study at SPring-8"Rev. Sci. Inst. 72. 1289-1292 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Watanuki 他: "Construction of laser-heated diamond anvil cell system for in-situ X-ray diffraction study at SPring-8"Rev. Sci. Inst. 72. 1289-1292 (2001)

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      「研究成果報告書概要(和文)」より
  • [Publications] N.Miyajima 他: "A host phase of aluminum and potassium in the Earth"s lower mantle"Am. Mineral.. 86. 740-746 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kondo 他: "Phase transitions of MnO to 137 GPa"J. Appl. Phys.. 87. 4153-4159 (2000)

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      「研究成果報告書概要(和文)」より
  • [Publications] Kondo T.: "Recent Advance in High pressure and High temperature Experiments using diamond anvil cell and synchrotron radiation (in Japanese)"The Review of High pressure Science and Technology. Vol. 12, 2 (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Vanpeteghem, C.B., E. Ohtani, T. Kondo: "Equation of state of hydrous phase δ-A1OOH at room temperature up to 22.5 GPa."Geophy. Res. Lett.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo T., T. Yagi, T. Kikegawa and T. Watanuki: "DAC experiments with synchrotron radiation (in Japanese)"Japanese Magazine of Mineralogical and Petrological Sciences. Vol. 30. 96-97 (2001)

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      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo T.: "Crystallography under the Core Condition of Planets (in Japanese)"Journal of Crystallographic Society of Japan. 43. 91-95 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo T.: "In-situ X-ray diffraction study with laser heated DAC"Advanced Materials (ISAM 2001). 341-344 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo T.: "In-situ X-ray diffraction experiments, using laser-heated diamond anvil cell"PF Activity Reports. 18A. 33-34 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyajima, N., T. Yagi, K. Hirose, T. Kondo, K. Fujino, H. Miura: "A host phase of aluminum and potassium in the Earth's lower mantle"American Mineralogist. 86. 740-746 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yagi,T, T. Kondo, T. Watanuki, O. Shimomura, and T. Kikegawa: "Laser heated diamond anvil apparatus at the Photon Factory and SPring-8: Problems and improvements"Rev. Sci. Inst.. 72. 1293-1297 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Watanuki, T., O. Shimomura, T. Yagi, T. Kondo, and M. Isshiki: "Construction of laser-heated diamond anvil cell system for in-situ X-ray diffraction study at SPring-8"Rev. Sci. Inst.. 72. 1289-1292 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suzuki, A., Eiji Ohtani, Tadashi Kondo, and Takahiro Kuribayashi, Nobuo Niimura, Kazuo Kurihara, and Toshiyuki Chatake: "Neutron diffraction study of hydrous phase G: Hydrogen in the lower mantle hydrous silicate, phase G"Geophys. Res. Lett.. 28. 3987-3990 (2001)

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      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo, T., Yagi, T., Syono, Y., Noguchi, Y., Atou, T., Kikegawa, T. and Shimomura, O.: "Phase transitions of MnO to l37 GPa"J. Appl. Phys.. 87. 4153-4159 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo, T, and T. Yagi: "Ultra-High pressure and high-temperature experiments using laser heated, diamond anvil cell (in Japanese)"Journal of High Pressure Institute of Japan. Vol .38, No. 6. 14-21 (2000)

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  • [Publications] Noguchi,Y., T. Atou, T. Kondo, T. Yagi, and Y. Syono: "High-pressure phase transformation of cobalt monoxide due to electronic transition"Jpn. J. Appl. Phys.. 38. 7-9 (1999)

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      「研究成果報告書概要(欧文)」より
  • [Publications] Wang, Z., T. Yagi, and T. Kondo: "Pressure-induced phase transformation and amorphization in Ca_3Fe_2Si_3O_<12>: a high pressure X-ray diffraction study"J. Phys. Chem. Solid. 60. 441-444 (1999)

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      「研究成果報告書概要(欧文)」より
  • [Publications] Miyajima, N., K. Fujino, N. Funamori, T. Kondo and T. Yagi: "Garnet-perovskite transformation under conditions of the Earth's lower mantle: an analytical transmission electron microscopy study"Phys. Earth Planet. Inter.. 116. 117-131 (1999)

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      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo T., T. Yagi and T. Mukaide: "Laser heated diamond anvil cell and its application to earth and planetary sciences (in Japanese)"The Review of High pressure Science and Technology. Vol. 9, 1. 43-50 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kondo T.: "High temperature use of DAC (in Japanese)"The Review of High pressure Science and Technology. Vol. 9, 4. 277-284 (1999)

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Published: 2003-09-17  

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