Author： Song S. Wang R. Gui J. Wang J. Yan Y.
Publisher： Taylor & Francis Ltd
ISSN： 1478-6443
Source： Philosophical Magazine, Vol.86, Iss.3-5, 2006-01, pp. : 529-541
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Abstract
The structure of type I and type II modifications of Al–Co–Ni decagonal quasicrystals was studied by using the high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM) technique. It was found that the quasi-unit-cell should be selected as columnar decagon of 3.2?nm in diameter and 0.82?nm in height, and its center consists of a bright circle with 0.76?nm of the outer diameter, indicating that atomic distribution in the quasi-unit-cell is disordered. Lattices obtained by connecting the centers of the atom clusters in HAADF images reveal that the lattice of the type I modification is rhombic Penrose tiling and the lattice of the type II is a mixture of the rhombic and pentagonal tilings. Namely, the lattice of the type II modification is a mixture of the lattices of the type I and S1 modifications.
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