Structure of Al4Mn Decagonal Phase as a Penrose-Type Lattice

  • Takeuchi Shin
    Institute for Solid State Physics, The University of Tokyo
  • Kimura Kaoru
    Institute for Solid State Physics, The University of Tokyo

書誌事項

タイトル別名
  • Structure of Al<SUB>4</SUB>Mn Decagonal Phase as a Penrose-Type Lattice
  • Structure of Al4Mn Decagonal Phase as a

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抄録

Electron and X-ray diffractions from a metastable phase in an Al79.5Mn20.5 alloy, formed by a rather slow quenching of the melt, have been consistently interpreted by the decagonal quasicrystalline phase (L. Bendersky: Phys. Rev. Lett. 55 (1985) 1461). A structural model of the phase is proposed, in which two unit cells with the Penroserhombic prisms (edge length 4.30 Å and height 4.15 Å), containing five and three atoms, are packed in a plane, satisfying a face-matching rule to form a Penrose-type lattice with a ten-fold symmetry. These quasicrystalline layers stack periodically with an ordered modulation at every three layers.

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