Crystal and magnetic structure of Er sub 2 (Co sub x Fe sub 1 minus sub x ) sub 17 compounds

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.344839· OSTI ID:6838267

Kumar, R ^[1]; Yelon, W B ^[2]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (USA)
2. University of Missouri Research Reactor, Columbia, Missouri 65211 (USA)

Room-temperature neutron-diffraction spectra on compositions {ital x}=0.0, 0.20, 0.40, 0.55, 0.80, and 1.0 have been obtained and analyzed for crystal and magnetic structures. The crystal structures deviate from the ideal Th{sub 2}Ni{sub 17} structures, as has been observed in the other hexagonal 2-17 materials. Structure analysis from the nuclear intensities at 350 K leads to a precise stoichiometry of Er{sub 1.91}Fe{sub 18.25} in Er{sub 2}Fe{sub 17}. Because of the high {ital T}{sub {ital c}} of the Co-rich compounds, the Er atoms align at relatively high temperature and the axial Er anisotropy dominates at room temperature. Only at {ital x}=0.4 composition is a spin reorientation from planar to axial observed below room temperature. The {ital f} site, which is analogous to the {ital c} site in rhombohedral Th{sub 2}Zn{sub 17} and the {ital j}{sub 2} site in Re{sub 2}Fe{sub 14}B, does not support a moment as large as on the {ital c} site and {ital j}{sub 2} site in respective phases. The moment reduction is probably related to atomic defects on the dumbbell {ital f} site.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6838267
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANISOTROPY
COBALT ALLOYS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ERBIUM ALLOYS
IRON ALLOYS
MAGNETIC PROPERTIES
MEDIUM TEMPERATURE
NEUTRON DIFFRACTION
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCATTERING
STOICHIOMETRY