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X-ray structural analysis of three dimensional quasicrystals

Research Project

Project/Area Number 03452244
Research Category

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

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionUniversity of Tokyo

Principal Investigator

NANAO Susumu  Institute of Industrial Science, University of Tokyo, Associate professor, 生産技術研究所, 助教授 (60013231)

Co-Investigator(Kenkyū-buntansha) WATANABE Yasuhiro  Institute of Industrial Science, University of Tokyo, Research Assistant, 生産技術研究所, 助手 (80182955)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1992: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1991: ¥4,500,000 (Direct Cost: ¥4,500,000)
KeywordsQuasicrystalline Alloy / Three Dimensional Quasicrystal / QCIC Model / F-type Quasicrystal / X-ray Diffraction / X-ray Abnormal Scattering / Atomic Cluster / Environmental Structure / 単結晶X線解析 / 原子クラスタ-
Research Abstract

Among the three dimensional quasicrystals, so called Mackay type and TC type quasicrystals are settling to the understanding of their atomic structures to be quasiperiodic arrangements of the atomic clusters with icosahedral symmetry, which are typically seen in QCIC (Quasiperiodic Configuration of Icosahedral Clusters) model proposed by the present group. The structures of so called F-type quasicrystals, which are recently discovered three dimensional quasicrystals, are still remained unknown.
The objective of the present study is to analyze the atomic structures of the F-type quasicrystals in Al-Cu-Fe, Al-Cu-Ru and Al-Pd-Mn alloy systems in comparison with the structure of conventional Mackey type quasicrystals and to construct the structural models.
The X-ray diffraction experiments were performed in Photon Factory of KEK. The diffraction profile was measured with powder samples. In the case of Al-Cu-Ru and Al-Pd-Mn systems, X-ray abnormal scattering was also measured at Ru edge and P … More d edge, respectively, in order to obtain the environmental structures around Ru and Pd atoms. Single crystals of the Al-Pd-Mn system were successfully grown by Bridgeman method and the diffraction was measured also for the single crystal.
The X-ray diffraction profiles present the extra peaks with odd indices that come from the ordered structures in the quasicrystals. The total pair distribution functions and the environmental pair distribution functions were calculated from the profiles. The detailed analysis revealed that the F-type quasicrystals have very similar local structures to those in the conventional Mackay type quasicrystals, which indicates that the F-type quasicrystals are also consist of quasiperiodic configurations of icosahedral clusters.
The models for F-type quasicrystals of Al-Cu-Ru and Al-Pd-Mn system were made, in which the two kinds of icosahedral clusters are arranged quasiperiodically and the clusters are distributed to the two kinds of quasilattice points according to the parity of the indices.
The models reproduced well the diffraction profiles, pair distribution functions and the values of other parameters experimentally obtained, which indicates the framework of the models reflects the real structures of the F-type quasicrystals. Less

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Yoshiraru Sakurai,Yoshikazu Tanaka,Yasuhiro Watanabe and Susumu Nanao: "Site of ruthenium in icosahedral Al-Mu-Ru-Si" Materials Science and Enginneering. A134. 896-899 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Nanao,Y.Watanabe and Y.Sakurai: "Structure of Mackay-type guasicrystals" Quasicrystals (Proc.China-Japan Seninars,ed.K.H.Kuo and T.Ninomiya. 190-193 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Watanabe,T.Ohara,O.Tsuda and S.Nanao: "A Structural Stady of Al-Pd-Mn Quasi crystals by X-ray Anomalous Scattering Method" Photon Factory Activity Report. #9. 246- (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Ohata,Y.Watanabe,O.Tsuda,C.W.Kim,J.Ishimaru,S.Nanao: "Structural Analysis of Al-Pd-Mn single-guasi-crystal" Photon Factory Activity Report. #10. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Sakurai, Y.Tanaka, Y.Watanabe and S.Nanao: "Site of ruthenium in icosahedral Al-Mn-Ru-Si" Mater. Sci. and Engrg. A134. 896-899 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Nanao, Y.Watanabe and Y.Sakurai: "Structure of Mackay-type quasicrystals" Quasicrystals (Proc. China-Japan Seminars,ed. by K.H.Kuo and T.Ninomiya). 190-193 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Watanabe, T.Ohata, O.Tsuda and S.Nanao: "A structural study of Al-Pd-Mn quasicrystals by X-ray anomalous scattering method" Photon Factory Activity Report. #9. 246 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Ohata, Y.Watanabe, O.Tsuda, C.W.Kim, J.Ishimaru and S.Nanao: "Structural Analysis of Al-Pd-Mn single-quasicrystal" Photon Factory Activity Report. #10. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Watanabe,T.Ohata,O.Tsuda and S.Nanao: "A Structural Study of Al-Pd-Mn Quasicrystals by a Xray Anomalous Scattering Method" Photon Factory Activity Report 1991. 9. 246 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Ohata,Y.Watanabe,O.Tsuda,C.W.Kim,J.Ishimaru and S.Nanao: "Structural Analysis of Al-Pd-Mn Single-quasicrystal" Photon Factory Activity Report 1992. 10. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Yoshiharu Sakurai,Yoshikazu Tanaka,Yasuhiro Watanabe and Susumu Nanao: "Site of ruthenium in icosahedral A1ーMnーRuーSi" Material Science an Engineering. A134. 896-899 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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