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Titolo:
The argyrodite gamma-Ag(9)ALSe(6): A non-metallic filled Laves phase
Autore:
Gaudin, E; Deiseroth, HJ; Zaiss, T;
Indirizzi:
Univ Siegen, D-57068 Siegen, Germany Univ Siegen Siegen Germany D-57068Univ Siegen, D-57068 Siegen, Germany Univ Strasbourg 1, CNRS, UMR 7510, RMN & Chim Solide, F-67070 Strasbourg, France Univ Strasbourg 1 Strasbourg France F-67070 , F-67070 Strasbourg, France
Titolo Testata:
ZEITSCHRIFT FUR KRISTALLOGRAPHIE
fascicolo: 1, volume: 216, anno: 2001,
pagine: 39 - 44
SICI:
0044-2968(2001)216:1<39:TAGANF>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-CRYSTAL STRUCTURE; BETA-MANGANESE PHASES; GAMMA-AG8GETE6; CONDUCTOR; COMPOUND; SILVER; FAMILY; ALPHA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Deiseroth, HJ Univ Siegen, Adolf Reichweinstr 2, D-57068 Siegen, Germany Univ Siegen Adolf Reichweinstr 2 Siegen Germany D-57068 any
Citazione:
E. Gaudin et al., "The argyrodite gamma-Ag(9)ALSe(6): A non-metallic filled Laves phase", Z KRISTALL, 216(1), 2001, pp. 39-44

Abstract

The crystal structure of the air sensitive argyrodite Ag9AlSe6 is determined by single-crystal X-ray diffraction at room temperature. Above the phasetransition at 287 K gamma -Ag9AlSe6 crystallizes with cubic symmetry, space group F (4) over bar 3m, with a=11.0947(2) Angstrom, V = 1365.68(9) Angstrom (3) and Z = 4. The structure refinement leads to a reliability factor of R = 0.0298 for 271 independent reflections and 45 variables. The seleniumsubstructure of the non-metallic gamma -Ag9AlSe6 is topologically equivalent to the arrangement of the Mg and Cu atoms in the tetrahedrally close packed intermetallic compound MgCu2, a cubic Laves phase. The selenium atoms form a 3D network of tetrahedra partially occupied by Al atoms in an orderedway. The electron density of silver was de scribed by means of a split model and a Gram-Charlier development of the atomic displacement factor for one silver position. This approach gives evidence for the diffusion pathways of silver atoms in the [AlSe6](9-) framework through tetrahedral holes.

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Documento generato il 04/07/20 alle ore 18:31:22