Atomic structure of the quasicrystal Al72Ni20Co8

Yanfa Yan () and Stephen J. Pennycook
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Yanfa Yan: Oak Ridge National Laboratory
Stephen J. Pennycook: Oak Ridge National Laboratory

Nature, 2000, vol. 403, issue 6767, 266-267

Abstract: Abstract Steinhardt et al.1 reported experimental evidence in support of the coverage model2,3,4 by presenting a structure for the high-perfection decagonal quasicrystal Al72Ni20Co8. The coverage model describes the decagonal quasicrystals by a single type of tile, a decagon, the basic 2-nm cluster of which is allowed to overlap so as to cover the surface. Although their Z-contrast image (also referred to as a high-angle annular dark-field image) supports the coverage model, we find that the atomic structure they propose for the decagon has significant shortcomings which are inconsistent with our Z-contrast images.

Date: 2000
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DOI: 10.1038/35002251

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