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Titolo:
THE CRYSTAL-STRUCTURES OF MO4AL17 AND MO5AL22
Autore:
GRIN YN; ELLNER M; PETERS K; SCHUSTER JC;
Indirizzi:
MAX PLANCK INST FESTKORPERFORSCH,HEISENBERGSTR 1 D-70569 STUTTGART GERMANY MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH D-70174 STUTTGART GERMANY UNIV VIENNA,INST PHYS CHEM A-1090 VIENNA AUSTRIA
Titolo Testata:
Zeitschrift fur Kristallographie
fascicolo: 2, volume: 210, anno: 1995,
pagine: 96 - 99
SICI:
0044-2968(1995)210:2<96:TCOMAM>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERMETALLIC COMPOUNDS; SYSTEM;
Keywords:
CRYSTAL STRUCTURE; MOLYBDENUM-ALUMINUM; SEGMENT INTERGROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
Y.N. Grin et al., "THE CRYSTAL-STRUCTURES OF MO4AL17 AND MO5AL22", Zeitschrift fur Kristallographie, 210(2), 1995, pp. 96-99

Abstract

Single crystals of two phases in the binary Mo-Al system were obtained from heat treated aluminum-rich alloys after the dissolution of the remaining solidified aluminum in hydrochloric acid. The crystal structures have been investigated using four-circle diffractometer data: Mo4Al17 was found to be monoclinic (space group C2, a = 9.158(1) Angstrom, b = 4.9323(8) Angstrom, c = 28.935(5) Angstrom, beta = 96.71(1)degrees, Z = 4), while Mo5Al22 was determined to be orthorhombic (space group Fdd 2, a = 73.82(3) Angstrom, b = 9.161(3) Angstrom, c = 4.933(2)Angstrom, Z = 8). Three different polyhedrons represent the atomic environment: a hexagonal cuboctahedron (CN = 12), a defect cuboctahedron (CN = 11) and a combination from cuboctahedron and rhombododecahedron (CN = 13). The crystal structures are interpreted in terms of the ''intergrowth'' concept as being built from slab segments taken from the closest packing with the composition TAl5, (related to WAl5, structure type, T - transition metal) and segments taken from the TiSi2 structure type (composition TAl2). The composition of the unit cell is describedby the formula Mo2m+2nAl10m+4n(m - number of TAl5-segments and n - number of TiSi2-segments in the unit cell).

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Documento generato il 03/12/20 alle ore 05:00:54