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

Eiji Abe | Zendy; Hiroyuki Takakura | Zendy; A.P. Tsai | Zendy

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

Author(s) -

Eiji Abe,

Hiroyuki Takakura,

A.P. Tsai

Publication year - 2001

Publication title -

microscopy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.545

H-Index - 52

eISSN - 2050-5701

pISSN - 2050-5698

DOI - 10.1093/jmicro/50.3.187

Subject(s) - quasicrystal , icosahedral symmetry , contrast (vision) , resolution (logic) , crystallography , materials science , physics , optics , chemistry , computer science , artificial intelligence

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.

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