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Journal of Electron Microscopy 50:187-195 (2001)
© 2001 Oxford University Press

Article

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

E Abe0,1,a, H Takakura0,1 and AP Tsai0,1

0 National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan,
1 CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama, Japan,
a Corresponding author, E-mail: abe.eiji@nims.go.jp

The atomic structure of the Zn6Mg3Ho is 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.

Keywords:atomic-resolution Z-contrast scanning transmission electron microscopy, icosahedral quasicrystals, intermetallic compound

Keywords     


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