Neutron diffraction studies of the atomic and magnetic structures of Ho/sub 6/Mn/sub 23/, Ho/sub 6/Mn/sub 23/D/sub 22/ and some Y/sub 6/(Fe/sub 1-x/Al/sub x/)/sub 23/ compounds
Thesis/Dissertation
·
OSTI ID:7225768
Neutron diffraction studies of three Y/sub 6/(Fe/sub 1-x/Al/sub x/)/sub 23/ compound (x = 0.05, 0.10, 0.15) at 523 and 77K reveal substantial preferential atomic ordering of Fe and Al atoms on the four crystallographic sites. Fe atoms prefer to occupy the f/sub 1/ site and Al atoms the f/sub 2/ site. The site preferences are explained on the basis of the comparative atomic volumes and the nearest neighbor distances. At 77 K the compounds are ferromagnetic. The Fe atoms exhibit different magnetic moments on the four sites. Neutron diffraction experiments were also performed on Ho/sub 6/Mn/sub 23/. At 77 K it is found to have a face-centered cubic crystal structure and a non-collinear magnetic structure, with the Ho moments tilted at an angle of 33.4/sup 0/ to the Mn moments. Powder neutron diffraction data for Ho/sub 6/Mn/sub 23/D/sub 22/ were analyzed by a modified Rietveld technique. At 298 K the space group is Fm3m; at 9K, P4/mmm. At 298K the deuteriums occupy the a, f/sub 3/, j, and k sites, in agreement with the predictions of Westlake's model. At 9K, a noncollinear antiferromagnetic structure is found.
- Research Organization:
- Missouri Univ., Rolla (USA)
- OSTI ID:
- 7225768
- Country of Publication:
- United States
- Language:
- English
Similar Records
Powder neutron diffraction study of antiferromagnetism in Er/sub 6/Mn/sub 23/D/sub 23/
Neutron diffraction studies of some rare earth-transition metal deuterides. Final report, 15 November 1983-1 December 1985
Powder neutron diffraction studies of Y/sub 6/Mn/sub 23/D/sub 23/, Er/sub 6/Mn/sub 23/D/sub 23/, and LaNi/sub 4/ /sub 5/Al/sub 0/ /sub 5/D/sub 4/ /sub 5/
Journal Article
·
Thu Dec 31 23:00:00 EST 1981
· AIP Conf. Proc.; (United States)
·
OSTI ID:6488682
Neutron diffraction studies of some rare earth-transition metal deuterides. Final report, 15 November 1983-1 December 1985
Technical Report
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Thu May 01 00:00:00 EDT 1986
·
OSTI ID:5163558
Powder neutron diffraction studies of Y/sub 6/Mn/sub 23/D/sub 23/, Er/sub 6/Mn/sub 23/D/sub 23/, and LaNi/sub 4/ /sub 5/Al/sub 0/ /sub 5/D/sub 4/ /sub 5/
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1981
·
OSTI ID:6108590
Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DEUTERIDES
DEUTERIUM COMPOUNDS
DIFFRACTION
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
HOLMIUM ALLOYS
HOLMIUM COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MAGNETIC PROPERTIES
MANGANESE ALLOYS
MANGANESE COMPOUNDS
NEUTRON DIFFRACTION
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ALLOYS
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DEUTERIDES
DEUTERIUM COMPOUNDS
DIFFRACTION
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
HOLMIUM ALLOYS
HOLMIUM COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MAGNETIC PROPERTIES
MANGANESE ALLOYS
MANGANESE COMPOUNDS
NEUTRON DIFFRACTION
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ALLOYS