Neutron-diffraction and Moessbauer-effect studies of Pr sub 2 (Fe sub 1 minus x Mn sub x ) sub 14 B

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

DOI:https://doi.org/10.1063/1.344778· OSTI ID:6905122

Pringle, O A; Fu, J ^[1]; Long, G J ^[2]; James, W J ^[3]; Xie, D; Yelon, W B ^[4]; Grandjean, F ^[5]

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1. Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65401 (USA)
2. Department of Chemistry, University of Missouri-Rolla, Rolla, Missouri 65401 (USA)
3. Department of Chemistry, University of Missouri-Rolla, Rolla, MO (USA) Graduate Center for Materials Research, University of Missouri-Rolla, Rolla, Missouri 65401 (USA)
4. University of Missouri Research Reactor, Columbia, Missouri 65211 (USA)
5. Institut de Physique, Universite de Liege, B-4000 Sart Tilman, Belgium (BE)

A neutron-diffraction investigation of a series of Pr{sub 2}(Fe{sub 1{minus}{ital x}}Mn{sub {ital x}}){sub 14}B samples, with {ital x} values of 0.00, 0.11, 0.22, 0.30, and 0.35, reveals a preference for the manganese to occupy the 8{ital j}{sub 2} transition-metal site,the transition-metal site with the largest Wigner--Seitz cell volume. Similar site occupancies have been reported previously for Er{sub 2}(Fe{sub 1{minus}{ital x}}Mn{sub {ital x}}){sub 14}B and Y{sub 2}(Fe{sub 1{minus}{ital x}}Mn{sub {ital x}}){sub 14}B. An analysis of the 295-K Moessbauer spectrum of Pr{sub 2}(Fe{sub 0.89}Mn{sub 0.11}){sub 14}B indicates that the internal hyperfine fields on the six iron sites are more substantially reduced from those found in Pr{sub 2}Fe{sub 14}B than would be expected from a simple magnetic dilution with manganese. The extent of the field reduction for a specific site increases with the number of manganese near neighbors for the site. Fits of the Moessbauer spectra of Pr{sub 2}(Fe{sub 0.78}Mn{sub 0.22}){sub 14}B, Pr{sub 2}(Fe{sub 0.70}Mn{sub 0.30}){sub 14}B, and Pr{sub 2}(Fe{sub 0.65}Mn{sub 0.35}){sub 14}B, which are paramagnetic at room temperature, give quadrupole splittings consistent with the quadrupole interactions in Pr{sub 2}Fe{sub 14}B.

• OSTI ID: 6905122
• 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
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BORIDES
BORON COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
IRON BORIDES
IRON COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETISM
MANGANESE BORIDES
MANGANESE COMPOUNDS
MATERIALS
MEDIUM TEMPERATURE
MOESSBAUER EFFECT
NEUTRON DIFFRACTION
PARAMAGNETISM
PHYSICAL PROPERTIES
PRASEODYMIUM BORIDES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS