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A high‐pressure study of ɛ‐FeSi, between 0 and 8.5 GPa, by time‐of‐flight neutron powder diffraction
Author(s) -
Wood I. G.,
David W. I. F.,
Hull S.,
Price G. D.
Publication year - 1996
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/s0021889895015263
Subject(s) - spallation neutron source , neutron diffraction , spallation , powder diffractometer , diffractometer , materials science , crystallography , neutron , powder diffraction , diffraction , compression (physics) , time of flight , crystal structure , chemistry , nuclear physics , physics , composite material , optics , chromatography
The crystal structure of cubic iron monosilicide, ɛ‐FeSi, has been determined at six pressures between 0 and 8.5 GPa by time‐of‐flight neutron powder diffraction, using the POLARIS diffractometer at the ISIS spallation neutron source. At all pressures, the material has space group P 2 1 3, with Z = 4 and both atoms on sites 4( a ) ( x, x, x ). The unusual sevenfold coordination of both atoms is unaltered by pressure, with the atomic coordinates remaining essentially fixed at x Fe = 0.137 (1) and x Si = −0.157 (1) throughout. An almost uniform compression of up to approximately 2% in interatomic distances is observed, owing to the reduction in cell parameter.