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X-ray diffraction analysis of solid hydrogen

Research Project

Project/Area Number 11440125
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionHimeji Institute of Technology

Principal Investigator

KAWAMURA Haruki  Science Himeji Institute of Technology, Prof., 理学部, 教授 (00192005)

Co-Investigator(Kenkyū-buntansha) SHIMOMURA Osamu  JAERI Director, 関西研究所, 研究主幹
AKAHAMA Yuichi  Science Himeji Institute of Technology, Assist., 理学部, 助手 (90202522)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥10,900,000 (Direct Cost: ¥10,900,000)
Fiscal Year 2000: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥7,500,000 (Direct Cost: ¥7,500,000)
KeywordsX-ray powder diffraction / High pressure / DAC / SR / Low temperature / Hydrogen / Deuterium
Research Abstract

The properties of compressed hydrogen are of fundamental interest in condensed matter and planetary physics. Recent optical studies up to 230 GPa have demonstrated that hydrogen has three solid phases, phase I, phase II and phase III.Structural studies of solid hydrogen by x-ray diffraction technique are severely restiricted because of the low scattering efficiency of hydrogen and the small size of sample at high pressure, and thus the structure of only phase I is crystallographically determined to be the hcp one by the single-crystal technique. Powder diffraction techniques, however, are still important because the fragmentation of single crystals is frequently caused at the structural transition accompanying a discontinuous change in volume. In this research, x-ray powder diffraction experiments at high pressures and low temperatures were carried out on the beam line BL10XU station at SPring-8. The wavelength was tuned with a Si (111) double-crystal monochromator to 0.6196 Å. An x-ray refractive lens made of molded PMMA was inserted in the x-ray path to enhance the density of the incident beam. The sample was exposed to an x-ray beam through a pinhole collimator of 26 μm diameter. Powder patterns were obtained by an angle-dispersive method with an image plate detector. Diamond anvil cell (DAC) were used for high pressure generation. X-ray powder diffraction studies on solid deuterium were carried out at 83 K and 94 GPa, at which conditions solid deuterium has been reported to transform into phase II.Three diffraction arcs from the sample were observed, which are assigned to the 100, 002 and 101 diffraction lines of the hcp lattice. Thus the center of each molecule is still on the hcp lattice in phase II.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] I.Nakahata et al.: "Structral studied of Solid methane at high pressures"Chem.Phys.Lett.. 302. 359-362 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Akahama et al.: "Simple-cubic-simple-hexagonal transition in phosphorus under pressure"Phys.Rev.. B59. 8520-8525 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Akahama et al.: "Structural stability and equation of state of simple-hexagonal phosphorus to 280 GPa : phase transition at 262GPa"Phys.Rev.. B61. 3139-3142 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Nakano et al.: "Ruby scale at low temperature calibrated by the NaCl gauge : Wavelength shift of ruby R1 fluorescence line"Jpn.J.Appl.Phys.. 39. 1249-1251 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kawamura et al.: "X-ray powder diffraction from solid deuterium"Solid State Commun.. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 川村春樹 他: "固体CX_4(X=H.F,Cl)の圧力誘起構造相転移"高圧力の科学と技術. 10. 200-207 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] I.Nakahata, N.Matsui, Y.Akahama, H.Kawamura: "Structural studies of solid methane at high pressure"Chem.Phys.Lett.. 302. 359-362 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Akahama, M.Kobayashi, H.Kawamura: "Simple-cubic-simple-hexagonal transition in phosphorus under pressure"Phys.Rev.. B59. 8520-8525 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Akahama, H.Kawamura: "Structural stability and equation of state of simple-hexagonal phosphorus to 280 GPa : phase transition at 260 GPa"Phys.Rev.. B61. 3139-3142 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Nakano, Y.Akahama, Y.Ohishi, H.Kawamura: "Ruby scale at low temperature calibrated by the NaCl gauge : wavelength shift of ruby R1 fluorescence line at high pressures and low temperatures"Jpn.J.appl.Phys.. 39. 1249-1251 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Akahama, H.Kawamura: "High-pressure infrared spectroscopy of solid oxygen"Phys.Rev.. B61. 8801-8805 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kawamura, Y.Akahama, S.Umemoto, K.Takemura, Y.Ohishi, O.Shimomura: "X-ray powder diffraction from solid deuterium"(to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Nakano,et.al: "Ruby Scale at Low Temperatures calibrated by the Nacl Gauge:"Jpn.J.Appl.Phys.. 39・3. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Akahama and H.Kawamura: "Structural stability and equation of state of simple-hexagonal phosphorus to 280GPa"Phys.Rev.. B61. 3139-3142 (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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