Ho arrangement in the Zn6Mg3Ho icosahedral quasicrystal studied by atomic-resolution Z-contrast STEM

E. Abe, H. Takakura, A. P. Tsai

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15 Citations (Scopus)

Abstract

The atomic structure of the Zn6Mg3Ho icosahedral quasicrystal has been studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) with Z-contrast (Z: atomic number). We demonstrate that in particular Z-contrast imaging is quite powerful for specifying heavy atom positions in the quasicrystalline compound, as shown by a comparison with high-resolution phase-contrast imaging. It is confirmed that the observed Z-contrast images are fairly well explained by the projected potential of only the Ho atomic arrangement, which was recently proposed by X-ray diffraction analysis; Ho occupies an even-body-center site of the 3-dimensional Penrose lattice. Consequently, the present direct structural observation strongly supports the validity of the proposed Ho site.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalJournal of Electron Microscopy
Volume50
Issue number3
DOIs
Publication statusPublished - 2001

Keywords

  • Atomic-resolution Z-contrast scanning transmission electron microscopy
  • Icosahedral quasicrystals
  • Intermetallic compound

ASJC Scopus subject areas

  • Instrumentation

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