Structural study of an Al72Ni20Co8 decagonal quasicrystal using the high-angle annular dark-field method

Koh Saitoh, Kenji Tsuda, Michiyoshi Tanaka, Kenji Kaneko, An Pang Tsai

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Abstract

High-angle annular dark-field (HAADF) images of an Al72Ni20Co8 decagonal quasicrystal have been taken for the first time. It has been found that the transition metals form pentagonal and star-shaped cluster columns with radii of about 0.4 nm. The atom-cluster columns with a 2 nm diameter of the alloy, which have been considered as the basic structural unit with decagonal symmetry so far, have been revealed to have no decagonal symmetry. These atom-cluster columns have been found to be decomposed into the pentagonal and star-shaped cluster columns, corresponding clusters existing in the Al13Fe4 monoclinic approximant. The tiling of the pentagonal and star-shaped clusters has been found to agree with the rhombic Penrose lattice for an area with a diameter greater than 50 nm.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume36
Issue number10 SUPPL. B
Publication statusPublished - Oct 15 1997
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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