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2004 Fiscal Year Final Research Report Summary

Phase transitions of sulfur under high-pressure and high-temperature condition

Research Project

Project/Area Number 15540456
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

KUSABA Keiji  Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (60186385)

Project Period (FY) 2003 – 2004
Keywordssulfur / multi-anvil type apparatus / synchrotron radiation / sintered diamond / phase transition / crystal structure / compression curve / P-T phase diagram
Research Abstract

High-pressure and high-temperature behavior of sulfur was directly observed, using a combination of multi-anvil type high-pressure apparatus"MAX80"and synchrotron radiation. Observable pressure and temperature range was expanded up to 17 GPa and 900℃ by using sintered diamond anvils. Three high-pressure phases were found in the range. All high-pressure phases were unquenchable at ambient condition. Crystal structures of the high-pressure phases were determined from their X-ray powder diffraction patterns. The high-pressure phase 1 has a hexagonal cell, in which sulfur atoms form helical chains. The high-pressure phase 2 has another hexagonal cell and the structure is built up of cyclic molecule of S_6. The high-pressure phase 3 contains another helical chains in a tetragonal cell. Compression behaviors of all high-pressure phases and the low-pressure phase were observed at room temperature condition. An anisotropic compression behavior was found in the case of the high-pressure phase 2. The pressure and temperature phase diagram of sulfur was also determined, based on the in-situ observations.

  • Research Products

    (7 results)

All 2005 2004

All Journal Article (7 results)

  • [Journal Article] 粉末X線回折パターンの指数付け法2005

    • Author(s)
      草場啓治
    • Journal Title

      高圧力の科学と技術 15

      Pages: 36-43

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Indexing method for X-ray powder diffraction patterns2005

    • Author(s)
      Keiji KUSABA
    • Journal Title

      Rev.High Press.Sci.Tec. 15

      Pages: 36-43

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Phase relationship of sulfur up to 8 GPa2004

    • Author(s)
      Keiji KUSABA
    • Journal Title

      PF Activity report B21

      Pages: 206-206

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Reversible phase transition of Zn(OH)_2 under hydrostatic condition2004

    • Author(s)
      Keiji KUSABA
    • Journal Title

      PF Activity report B21

      Pages: 200-200

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 日本におけるマルチアンビル型高圧装置の創世記2004

    • Author(s)
      草場啓治
    • Journal Title

      高圧力の科学と技術 14

      Pages: 305-311

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Reversible phase transition of Zn(OH)2 under hydrostatic condition2004

    • Author(s)
      Keiji KUSABA
    • Journal Title

      PF Activity report B21

      Pages: 200-200

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Genesis of multi-anvil high pressure apparatus in Japan2004

    • Author(s)
      Keiji KUSABA
    • Journal Title

      Rev.High Press.Sci.Tec. 14

      Pages: 305-311

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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