TY - JOUR
T1 - Structure analysis of Zn-Mg-Ho icosahedral quasicrystal by modified Rietveld method using ellipsoid and sphere windows
AU - Ishimasa, Tsutomu
AU - Oyamada, Kei
AU - Arichika, Yasuomi
AU - Nishibori, Eiji
AU - Takata, Masaki
AU - Sakata, Makoto
AU - Kato, Kenichi
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research B from Japan Society for the Promotion of Science. The synchrotron radiation experiments were performed at SPring-8 BL02B2 with the approval of the Japan Synchrotron Radiation Research Institute.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/3/15
Y1 - 2004/3/15
N2 - A structure analysis of the Zn-Mg-Ho icosahedral quasicrystal was carried out by the powder X-ray diffraction method using synchrotron radiation (λ = 0.73490 Å) at SPring-8. The intensity distribution was analyzed by the Rietveld method modified for an icosahedral quasicrystal, in which simplified models were assumed: ellipsoid and spherical windows were assumed at five crystallographic sites in a F-type hypercubic unit cell. The analysis revealed the presence of an almost perfect Penrose tiling with edge length 5.20 Å. The vertices are occupied alternatively by Zn and Mg, and almost all of the edge centers of the Penrose rhombohedra are occupied by 0.8Zn and 0.2Mg. Ho and Mg atoms tend to be present on the body diagonal of the prolate rhombohedra. Good agreement between the measured and calculated intensity distribution using the simplified model suggests the applicability and the limitation of the structure analysis using the powder X-ray diffraction method.
AB - A structure analysis of the Zn-Mg-Ho icosahedral quasicrystal was carried out by the powder X-ray diffraction method using synchrotron radiation (λ = 0.73490 Å) at SPring-8. The intensity distribution was analyzed by the Rietveld method modified for an icosahedral quasicrystal, in which simplified models were assumed: ellipsoid and spherical windows were assumed at five crystallographic sites in a F-type hypercubic unit cell. The analysis revealed the presence of an almost perfect Penrose tiling with edge length 5.20 Å. The vertices are occupied alternatively by Zn and Mg, and almost all of the edge centers of the Penrose rhombohedra are occupied by 0.8Zn and 0.2Mg. Ho and Mg atoms tend to be present on the body diagonal of the prolate rhombohedra. Good agreement between the measured and calculated intensity distribution using the simplified model suggests the applicability and the limitation of the structure analysis using the powder X-ray diffraction method.
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U2 - 10.1016/j.jnoncrysol.2003.11.043
DO - 10.1016/j.jnoncrysol.2003.11.043
M3 - Conference article
AN - SCOPUS:17744407602
SN - 0022-3093
VL - 334-335
SP - 167
EP - 172
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
T2 - 8th International Conference on Quasicrystals
Y2 - 8 September 2002 through 13 September 2002
ER -