The structure of a decagonal Al72Ni20Co8 quasicrystal

Citation
H. Takakura et al., The structure of a decagonal Al72Ni20Co8 quasicrystal, ACT CRYST A, 57, 2001, pp. 576-585
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ACTA CRYSTALLOGRAPHICA SECTION A
ISSN journal
0108-7673 → ACNP
Volume
57
Year of publication
2001
Part
5
Pages
576 - 585
Database
ISI
SICI code
0108-7673(200109)57:<576:TSOADA>2.0.ZU;2-R
Abstract
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-rt model structure based o n a cluster model having lower symmetry than the decagonal symmetry with 10 3 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 Angstrom and is very consistent with recent high-resolution electro n-microscopy images. The refined structure is compared with previously disc ussed model structures including cluster-based models having 20 Angstrom te nfold symmetric clusters.