The structure of a decagonal Al72Ni20Co8 quasicrystal.
The structure of a decagonal Al72Ni20Co8 quasicrystal with space group P10(5)/mmc has been determined on the basis of a single-crystal X-ray data set using the five-dimensional description. The best-fit model structure based on a cluster model having lower symmetry than the decagonal symmetry with 103 parameters gives wR = 0.045 and R = 0.063 for 449 reflections. The structure is well described by the hexagon, boat and star tiling with an edge length of 6.36 A and is very consistent with recent high-resolution electron-microscopy images. The refined structure is compared with previously discussed model structures including cluster-based models having 20 A tenfold symmetric clusters.
Takakura
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CREST, Japan Science and Technology Corporation and National Research Institute for Metals, Tsukuba 305-0047, Japan. takakura@tamamori.nims.go.jp
Yamamoto
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Tsai
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AP