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  Towards realistic quasiperiodic structures: modelling, synthesis and structure of (Ga,Zn)(175-delta)Mg97+delta - a large 3/2-2/1-2/1 Fibonacci approximant

Kreiner, G. (2002). Towards realistic quasiperiodic structures: modelling, synthesis and structure of (Ga,Zn)(175-delta)Mg97+delta - a large 3/2-2/1-2/1 Fibonacci approximant. Journal of Alloys and Compounds, 338(1-2), 261-273. doi:10.1016/S0925-8388(02)00240-2.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-3151-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-00DF-1
Genre: Journal Article

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 Creators:
Kreiner, G.1, Author              
Affiliations:
1Guido Kreiner, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863433              

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Free keywords: quasicrystal; approximant; gallium; zinc; magnesium
 Abstract: A tiling approach towards primitive hypercubic icosahedral quasicrystals of the Bergman cluster type is presented. A set of decoration rules for Bergman cluster approximants was derived from the crystal structures of the 1/1-(Al,Zn)(3)Mg-2 and the 2/1-(Al,Zn)(3+delta)Mg2-delta Fibonacci approximants. Both structures are well described as a Bergman cluster packing with two types of cluster connections. Clusters connected along threefold axes share Common hexagons and clusters along twofold axes share common edges. The cluster networks are compatible with canonical cell filings. An approximant of 3/2-2/1-2/1 type in the Ga-Mg-Zn system ((Ga,Zn)(43)Mg-26, Z=16, Cmc2(1), oC1104 a=36.8 Angstrom, b=c=22.8 Angstrom) was modelled using the next higher canonical cell and the decoration rules. Suitable single crystals of the 3/2-2/1-2/1 approximant were obtained by melting and annealing ternary alloys with target compositions with x(Mg)=0.38-0.44 and a free electron per atom ratio of e/a=2.09-2.19. The structure was successfully refined to (Ga,Zn)(175-delta)Mg97+delta (delta approximate to 3, (Ga,Zn)(67)Mg-37, x(Ga) approximate to 0.09-0.19, Z=4, Cmc2(1), a=36.840(7) Angstrom, b=22.782(5) Angstrom, c=22.931(5) Angstrom, N-ind = 23398 (9105 >2sigma(F-2); N-var = 576, R- 1/wR(2) = 0.170/0.154). (C) 2002 Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002-05-16
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 17772
ISI: 000175886300038
DOI: 10.1016/S0925-8388(02)00240-2
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Title: Journal of Alloys and Compounds
  Alternative Title : J. Alloy. Compd.
Source Genre: Journal
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Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 338 (1-2) Sequence Number: - Start / End Page: 261 - 273 Identifier: ISSN: 0925-8388