Structural study of an Al70Ni15Fe15 decagonal quasicrystal using high-angle annular dark-field scanning transmission electron microscopy

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

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18 Citations (Scopus)

Abstract

High-angle annular dark-field (HAADF) images of a melt-quenched A170Ni15Fe15 decagonal quasicrystal have been taken using a scanning transmission electron microscope for the first time. We have found that the alloy is composed of 2-nm-diameter atom clusters with fivefold symmetry. We have also observed an inversion domain structure. A structural model has been constructed on the basis of the HAADF images and the fivefold cluster of the monoclinic τ2-Al13Co4 approximant model. Antiphase shifts at domain boundaries have been observed directly for the first time. The present observation has verified the results of high-resolution electron microscopy (HREM) and the dark-field imaging technique obtained by Tsuda et al.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume38
Issue number6 A/B
Publication statusPublished - 1999 Jun 15

ASJC Scopus subject areas

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

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