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STRUCTURE ANALYSIS OF DECAGONAL QUASICRYSTALS USING THE HIGH-ANGLE ANNULER DARK-FIELD SCANNING TRANSMISSION ELECTRON MICROSCOPE METHOD.

Research Project

Project/Area Number 11304020
Research Category

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

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

TANAKA Michiyoshi  RESEARCH INSTITUTE FOR SCIENTIFIC MEASUREMENTS, Tohoku University, PROFESSOR, 科学計測研究所, 教授 (90004291)

Co-Investigator(Kenkyū-buntansha) SAITOH Koh  RESEARCH INSTITUTE FOR SCIENTIFIC MEASUREMENTS, Tohoku University, RESEARCH ASSOCIATE, 科学計測研究所, 助手 (50292280)
TSUDA Kenji  RESEARCH INSTITUTE FOR SCIENTIFIC MEASUREMENTS, Tohoku University, RESEARCH ASSOCIATE, 科学計測研究所, 助手 (00241274)
TERAUCHI Masami  RESEARCH INSTITUTE FOR SCIENTIFIC MEASUREMENTS, Tohoku University, ASSOCIATE PROFESSOR, 科学計測研究所, 助教授 (30192652)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥37,400,000 (Direct Cost: ¥37,400,000)
Fiscal Year 2000: ¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 1999: ¥28,400,000 (Direct Cost: ¥28,400,000)
KeywordsQUASICRYSTAL / APPROXIMANT / TRANSMISSION ELECTRON MICROSCOPE / HIGH-ANGLE ANNULAR DARK-FIELD METHOD / STRUCTURE ANALYSIS
Research Abstract

○Al_<72>Ni_<20>Co_8, Al_<73>Ni_<22>Fe_5 decagonal quasicrystals
We, using the HAADF method, revealed that the atom cluster of an Al_<72>Ni_<20>Co_8 decagonal quasicrystal, which had been believed to be of tenfold rotation symmetry, is not of tenfold but of mirror symmetry for the first time, Furthermore, we found that Al_<72>Ni_<20>Co_8 is composed of basic atom clusters, which exist in a basic quasicrystalline approximant of monoclinic Al_<13>Fe_4. On the basis of the approximant structure, a new structural model of Al_<72>Ni_<20>Co_8 was constructed. It was also found using the HAADF method that an Al_<73>Ni_<22>Fe_5 decagonal quasicrystal has a similar structure to that of Al_<72>Ni_<20>Co_8.
○Al-Ni-Fe non-centrosymmetric decagonal quasicrystal
We previously found, by conventional high-resolution electron microscopy, that an Al_<70>Ni_<15>Fe_<15> quasicrystal is formed by an atom cluster with fivefold rotation symmetry. We applied the HAADF method to the quasicrystal for the first time … More , and verified that the atom cluster is truly of fivefold symmetry. Furthermore, a structural model was constructed on the basis of the HAADF image and an approximant structure. The direct observation of an antiphase shift at an inversion domain boundary, which had not been carried out, was successfully performed by the HAADF method.
○Al-Fe and Al-Co crystalline approximants
From the HAADF observations of an Al_<13>Fe_4 crystalline approximant, whose structure was already solved, it was confirmed that the HAADF images exhibit transition-metal-atom positions selectively. We found that HAADF images of a O^2-inflated Al_<13>Co_4 approximant show a similar image of the 2nm-diameter atom-clusters of decagonal quasicrystals. On the basis of the HAADF images and the structure of Al_<13>Fe_4, a structural model of O^2-inflated Al_<13>Co_4 approximant was constructed. Furthermore, by the comparison between the decagonal quasicrystal and its approximant structures, a formation model of decagonal quasicrystals from the O^2-inflated Al_<13>Co_4 was proposed. Less

Report

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

    (34 results)

All Other

All Publications (34 results)

  • [Publications] 田中通義 他: "高機能電子顕微鏡をもちいて明らかにされた準結晶構造と準単位胞モデル"まてりあ,特集号. 39・8. 645-653 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "Structural studies on decagonal quasicrystals using the HAADF-STEM and CBED method."Zeitschrift fuer Kristallographie. 215・1. 618-626 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tadahiro Yokosawa et al.: "Space Group Determination of Monoclinic and Orthorhombic Al_<13>Co_4 Approximants by the Convergent-Beam Electron Diffraction Method."Journal of Physical Society of Japan. 69・6. 1568-1589 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "ALCHEMI Study of an Al_<72>Ni_<20>Co_8 Decagonal Quasicrystal."Journal of Physical Society of Japan. 69・8. 2379-2382 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "Structural study of an Al_<73>Ni_<22>Fe_5 decagonal quasicrystal by high-angle annular dark-field scanning transmission electron microscopy."Journal of Electron Microscopy. (accepted). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Distinction of Space Groups (I23 & I2_13) and (I222 & I2_12_12_1) using coherent convergent-beam electron diffraction."Acta Crystallographica. A56・4. 359-369 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Electron diffraction study of the phase transformation of α'-NaV_2O_5."Journal of Physical Society of Japan. 69・7. 1935-1938 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Space group determination of the room-temperature phase of α'-NaV_2O_5 using convergent-beam electron diffraction."Journal of Physical Society of Japan. 69・7. 1939-1941 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Convergent-beam electron diffraction study of the low-temperature ferromagnetic insulator phase of La_<1-x>Sr_xMnO_3 (x=0.11, 0.12)."Journal of Physical Society of Japan. (accepted). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "Distinction between the space groups having rotation and screw axes, which are combined with 2 fold rotation axes, using the coherent convergent-beam electron diffraction method."Acta Crystallographica A. (accepted). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Michiyoshi Tanaka et al.: "Quasicrystalline structure and quasi-unit-cell model revealed by using high-performance electron microscopes"MATERIA, Special issue. 39-8(in Japanese). 645-653 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "Structural studies on decagonal quasicrystals using the HAADF-STEM and CBED method."Zeitschrift fuer kristallographie. 215-1. 618-626 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tadahiro Yokosawa et al.: "Space Group Determination of Monoclinic and Orthorhombic Al_<13>Co_4 Approximants by the Convergent-Beam Electron Diffraction Method."Journal of Physical Society of Japan. 69-6. 1568-1589 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "ALCHEMI Study of an Al_<72>Ni_<20>Co_8 Decagonal Quasicrystal."Journal of Physical Society of Japan. 69-8. 2379-2382 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "Structural study of an Al_<73>Ni_<22>Fe_5 decagonal quasicrystal by high-angle annular dark-field scanning transmission electron microscopy."Journal of Electron Microscopy. (accepted). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Distinction of Space Groups (/23 &/2_13) and (/222 & /2_12_12_1) using coherent convergent-beanm electron diffraction."Acta Crystallographica. A56-4. 359-369 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Electron diffraction study of the phase transformation of α'-NaV_2O_5."Journal of Physical Society of Japan. 69-7. 1935-1938 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Space group determination of the room-temperature phase of α'-NaV_2O_5 using convergent-beam electron diffraction."Journal of Physical Society of Japan. 69-7. 1939-1941 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kenji Tsuda et al.: "Convergent-beam electron diffraction study of the low-temperature ferromagnetic insulator phase of La_<1-x>Sr_xMnO_3 (x=0.11, 0.12)."Journal of Physical Society of Japan. (accepted). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koh Saitoh et al.: "Distinction between the space groups having rotation and screw axes, which are combined with 2 fold rotation axes, using the coherent convergent- beam electron diffraction method."Acta Crystallographica A. (accepted). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 田中通義 他: "高機能電子顕微鏡をもちいて明らかにされた準結晶構造と準単位胞モデル"まてりあ,特集号. 39・8. 645-653 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Koh Saitoh et al.: "Structural studies on decagonal quasicrystals using the HAADF-STEM and CBED method."Zeitschrift fuer Kristallographie. 215・1. 618-626 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tadahiro Yokosawa et al.: "Space Group Determination of Monoclinic and Orthorhombic Al_<13>Co_4 Approximants by the Convergent-Beam Electron Diffraction Method."Journal of Physical Society of Japan. 69・6. 1568-1589 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Koh Saitoh et al.: "ALCHEMI Study of an Al_<72>Ni_<20>Co_8 Decagonal Quasicrystal."Journal of Physical Society of Japan. 69・8. 2379-2382 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Koh Saitoh et al.: "Structural strudy of an Al_<73>Ni_<22>Fe_5 decagonal quasicrystal by high-angle annular dark-field scanning transmission electron microscopy."Journal of Electron Microscopy. (accepted). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kenji Tsuda et al.: "Distinction of Space Groups (I23 & I2_13) and (I222 & I2_12_12_1) using coherent convergent-beam electron diffraction."Acta Crystallographica. A56・4. 359-369 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kenji Tsuda et al.: "Electron diffraction study of the phase transformation of α'-NaV_2O_5."Journal of Physical Society of Japan. 69・7. 1935-1938 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kenji Tsuda et al.: "Space group determination of the room-temperature phase of α'-NaV_2O_5 using convergent-beam electron diffraction."Journal of Physical Society of Japan. 69・7. 1939-1941 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kenji Tsuda et al.: "Convergent-beam electron diffraction study of the low-temperature ferromagnetic insulator phase of La_<1-x>Sr_xMnO_3(x=0.11,0.12)."Journal of Physical Society of Japan. (accepted). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Koh Saitoh et al.: "Distinction between the space groups having rotation and screw axes, which are combined with 2 fold rotation axes, using the coherent convergent-beam electron diffraction method."Acta Crystallographica A. (accepted). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Koh Saitoh: "Structural study of an Al_<70>Ni_<15>Fe_<15> decagonal quasicrystal using high-angle annular dark-field scanning transmission electron microscopy"Japanese Journal of Applied Physics. 38・6. 671-674 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Koh Saitoh: "Formation of an Al-Co decagonal quasicrystal from a τ^2-inflated Al_<13>Co_4 approximant"Journal of the Physical Society of Japan. 68・9. 2886-2889 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Koh Saitoh: "Structural studies of monoclinic approximants of Al_<13>Fe_4 and τ^2-inflated Al_<13>Co_4 by the high-angle annular dark-field method"Journal of Electron Microscopy. 48・2. 105-114 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Koh Saitoh: "Structural studies of decagonal quasicrystal and approximants using the high-angle annular dark-field method"MRS symposium proceedings vol. 553 Quasicrystals (eds.J. M. Dubois et al.). 177-182 (1999)

    • Related Report
      1999 Annual Research Report

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

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