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Phases, lattice parameters and thermal expansion of HoNi 5− x Al x , 4 ≥ x ≥ 0
Author(s) -
Grzeta B.,
Sorgić B.,
Blazina Z.
Publication year - 1997
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897002392
Subject(s) - isostructural , thermal expansion , anisotropy , lattice (music) , hexagonal crystal system , materials science , lattice constant , x ray crystallography , thermal , diffraction , crystallography , condensed matter physics , thermodynamics , crystal structure , chemistry , metallurgy , physics , optics , acoustics
The phases, lattice parameters and linear coefficient of thermal expansion were determined by X‐ray powder diffraction between room temperature and 873 K for the system HoNi 5 − x Al x (3 ≥ x ≥ 0). Alloys were hexagonal, in the space group P 6/ mmm ; for 2 ≥ x ≥ 0 they were isostructural with CaCu 5 , and for 3 ≥ x ≥ 2 they were isostructural with YCo 3 Ga 2 . In both cases, the unit‐cell parameters a and c increased as the Al content increased. The linear thermal expansion coefficient was composition dependent. Each of the investigated alloys exhibited an anisotropy in thermal expansion, the linear expansion coefficient along the a axis being larger than along the c axis.