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Study on mesoscopic physical phenomenon in many particle systems by electron holography

Research Project

Project/Area Number 11440101
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTohoku University

Principal Investigator

HIRAGA Kenji  Tohoku Univ., Institute for Materials Research, Professor, 金属材料研究所, 教授 (30005912)

Co-Investigator(Kenkyū-buntansha) OHSUNA Tetsu  Tohoku Univ., Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (60271962)
SUGIYAMA Kazumasa  Tokyo Univ., Dept.of Science, Associate Professor, 大学院・理学系研究科, 助教授 (40196762)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥15,600,000 (Direct Cost: ¥15,600,000)
Fiscal Year 2000: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1999: ¥13,200,000 (Direct Cost: ¥13,200,000)
KeywordsCrystalline approximant / Cubic structure / Quasicrystals / Icosahedral quasicrystals / X-ray diffraction / Single crystal X-ray diffractometry / Crystal structure / 立方晶近似結晶 / 立方晶相 / 正20面体原子クラスター
Research Abstract

1) We determined site occupancy of Zn atoms in (Al, Zn)_<49>Mg_<32>-type Mg_<40>Al_<60-x>Zn_x (x=14=51) alloys by single crystal X-ray diffractometry. We also demonstrated that they have no atom at the center of Bergman-type atom cluster, on the contrary to the previously proposed models.
2) We succeeded in fabricating a single crystal of 2/1 cubic approximant, which were found in (Al, Zn)-Mg alloys, and determined sophisticated structure of Bergman clusters by X-ray diffractometry.
3)Single crystal diffractometry allowed us to determine the structure of the following 1/0 crystalline approximants : Al_<66.8>Pd_<21.2>Ru_<12.0> (Fms ; a=1.56058nm), Al_<63.6>Pd_<30.2>Fe_<6.2> (Fms ; a=1.55187nm), and Al_<68.9>Pd_<17.1>Fe_<13.9> (Fms ; a=1.53755nm). Surrounding the 1/4, 1/4, 1/4 position, Al assumes icosahedral coordination, which were also surrounded by pentagonally-coordinated clusters that share edges and forms a simple cubic arrangement.
4) We showed, using single crystal X-ray diffractometry, that Al_<57.3>Cu_<31.4>Ru_<11.3> 1/1 crystalline approximant belongs to the cubic system with Pm3 and a=1.23773, in which truncated dodecahedron clusters arrange themselves in a cubic manner, sharing octahedrons.
5)We also showed that 1/0, 1/1, 2/1 crystalline approximants are grouped into the simple cubic and body-centered cubic systems when viewed via arrangements of icosahedral atom clusters.

Report

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

    (19 results)

All Other

All Publications (19 results)

  • [Publications] K.Hiraga,T.Ohsuna and K.Sugiyama: "Atom Clusters with Icosahedral Symmetry in Cubic Alloy Phases Related to Icosahedral Quasicrystals"The Rigaku Journal. 16・1. 38-45 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Saito,K.Sugiyama and K.Hiraga: "New l/l Cubic Approximant Phases in the Al-Cu-Ru-Si System Studied by Electron Diffraction and High-Resolution Electron Microscopy"Philos.Mag.Lett.. 80・2. 73-78 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sugiyama,T.Kato,T.Ogawa,K.Hiraga,and K.Saito: "Crystal.Structure of a New l/l-Rational Approximant for the Al-Cu-Ru Icosahedral Phase"Journal or Alloys and Compounds. 299. 169-174 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] W.Sun and F.J.Lincoln,K.Sugiyama,and K.Hiraga: "Structure Refinement of(Al,Zn)_<49>Mg_<32>-Type Phases by Single-Crystal X-ray Diffraction"Materials Science and Engineering. 294-296. 327-330 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sugiyama,K.Hiraga and K.Saito: "Cubic Approximants in the Al-Pd-Fe and Al-Pd-Ru Systems"Materials Science and Engineering. 294-296. 345-347 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 杉山和正,平賀賢二: "正20面体準結晶の近似結晶"まてりあ. 39・8. 635-640 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Hiraga, T.Ohsuna and K.Sugiyama: "Atom Clusters with Icosahedral Symmetry in Cubic Alloy Phases Related to Icosahedral Quasicrystals"The Rigaku Journal. 16 1. 38-45 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Saito, K.Sugiyama and K.Hiraga: "New 1/1 Cubic Approximant Phases in the Al-Cu-Ru-Si System Studied by Electron Diffraction and High-Resolution Electron Microscopy"Philos.Mag.Lett.. 80 2. 73-78 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sugiyama, T.Kato, T.Ogawa, K.Hiraga, and K.Saito: "Crystal Structure of a New 1/1-Rational Approximant for the Al-Cu-Ru Icosahedral Phase"Journal of Alloys and Compounds. 299. 169-174 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] W.Sun and F.J.Lincoln, K.Sugiyama, and K.Hiraga: "Structure Refinement of (Al, Zn)_<49>Mg_<32>-Type Phases by Single-Crystal X-ray Diffraction"Materials Science and Engineering. 294-296. 327-330 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sugiyama, K.Hiraga and K.Saito: "Cubic Approximants in the Al-Pd-Fe and Al-Pd-Ru Systems"Materials Science and Engineering. 294-296. 345-347 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sugiyama, and K.Hiraga: "Approximants for the Icosahedral Quasicrystalline Phase"Materia Japan. 39 8. 635-640 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Hiraga,T.Ohsuna and K.Sugiyama: "Atom Clusters with Icosahedral Symmetry in Cubic Alloy Phases Related to Icosahedral Quasicrystals"The Rigaku Journal. 16・1. 38-45 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Saito,K.Sugiyama and K.Hiraga: "New 1/1 Cubic Approximant Phases in the Al-Cu-Ru-Si System Studied by Electron Diffraction and High-Resolution Electron Microscopy"Philos.Mag.Lett.. 80・2. 73-78 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Sugiyama,T.Kato,T.Ogawa,K.Hiraga,and K.Saito: "Crystal Structure of a New 1/1-Rational Approximant for the Al-Cu-Ru Icosahedral Phase"Journal of Alloys and Compounds. 299. 169-174 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] W.Sun and F.J.Lincoln,K.Sugiyama,and K.Hiraga: "Structure Refinement of (Al,Zn)_<49>Mg_<32>-Type Phases by Single-Crystal X-ray Diffraction"Materials Science and Engineering. 294-296. 327-330 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Sugiyama,K.Hiraga and K.Saito: "Cubic Approximants in the Al-Pd-Fe and Al-Pd-Ru Systems"Materials Science and Engineering. 294-296. 345-347 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 杉山和正,平賀賢二: "正20面体準結晶の近似結晶"まてりあ. 39・8. 635-640 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Saito,K.Sugiyama and K.Hiraga: "New 1/1 Cubic Approximant Phases in the Al-Cu-Ru-Si system studied by Electron Diffraction and High-Resolution Electron Microscopy"Philosophical Magazine Letters. 80・2. 73-78 (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2020-05-15  

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