Analysis of Pulsed-Neutron Powder Diffraction Patterns of the Icosahedral Quasicrystals Pd3SiU and AlCuLiMg (Three Alloys) as Twinned Cubic Crystals with Large Units

The low-Q peaks on three pulsed-neutron powder patterns (total, U differential, and Pd differential) of the icosahedral quasicrystal Pd3SiU have been indexed on the basis of an assumed cubic structure of the crystals that by icosahedral twinning form the quasicrystal. The primitive unit cube is foun... Ausführliche Beschreibung

1. Person: Pauling, Linus
Quelle: in Proceedings of the National Academy of Sciences of the United States of America Vol. 88, No. 15 (1991), p. 6600-6602
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Format: Online-Artikel
Sprache: English
Veröffentlicht: 1991
Beschreibung: Online-Ressource
Schlagworte: research-article
Chemistry
U- and Pd-Differential Diffraction Patterns
Doubly Icosahedral Complexes
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Anmerkung: Copyright: Copyright 1991 The National Academy of Sciences of the United States of America
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245 1 0 |a Analysis of Pulsed-Neutron Powder Diffraction Patterns of the Icosahedral Quasicrystals Pd3SiU and AlCuLiMg (Three Alloys) as Twinned Cubic Crystals with Large Units  |h Elektronische Ressource 
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520 |a The low-Q peaks on three pulsed-neutron powder patterns (total, U differential, and Pd differential) of the icosahedral quasicrystal Pd3SiU have been indexed on the basis of an assumed cubic structure of the crystals that by icosahedral twinning form the quasicrystal. The primitive unit cube is found to have edge length 56.20 Å and to contain ≈ 12,100 atoms. Similar analyses of pulsed-neutron patterns of Al55Cu10Li35, Al55Cu10Li30Mg5, and Al510Cu125Li235Mg130give values of the cube edge length 58.3, 58.5, and 58.4 Å, respectively, with ≈ 11,650 atoms in the unit cube. It is suggested that the unit contains eight complexes in the β-W positions, plus some small interstitial groups of atoms, with each complex consisting of a centered icosahedron of 13 clusters, each of 116 atoms with the icosahedral structure found in the body-centered cubic crystal Mg32(Al,Zn)49. 
653 |a research-article 
653 |a Chemistry 
653 |a U- and Pd-Differential Diffraction Patterns 
653 |a Doubly Icosahedral Complexes 
773 0 8 |i in  |t Proceedings of the National Academy of Sciences of the United States of America  |d Washington, DC : National Acad. of Sciences  |g Vol. 88, No. 15 (1991), p. 6600-6602  |q 88:15<6600-6602  |w (DE-601)JST069399220  |x 0027-8424 
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