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

Journal Article · · Applied Physics Communications; (USA)

OSTI ID:6288843

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

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1. Univ. of Missouri, Rolla (USA)
2. Univ. of Missouri, Columbia (USA)
3. Universite de Liege (Belgium)

The preferential site occupation by manganese and the temperature and compositional dependence of the hyperfine parameters for the six iron sites in a series of Pr{sub 2}(Fe{sub 1{minus}x}Mn{sub x}){sub 14}B samples have been studied by neutron diffraction and Mossbauer effect spectroscopy. Both neutron diffraction patterns and Mossbauer spectra indicate a marked preference for manganese atoms to occupy the j{sub 2} transition metal site, which has the largest site volume among the six iron sites in the Pr{sub 2}Fe{sub 14}B structure. The relative ordering of the internal hyperfine field is assigned to be H{sub int}(8j{sub 2}) > H{sub int}(16k{sub 2}) > H{sub int}(4e) {approx equal} H{sub int}(16k{sub 1}) > H{sub int}(ij{sub 1}) > H{sub int}(4c). This assignment is supported by the temperature and compositional dependencies of the Mossbauer effect hyperfine parameters. The area weighted average H{sub int} in Pr{sub 2}Fe{sub 14}B is slightly smaller than in Nd{sub 2}Fe{sub f14}B but greater than in Y{sub 2}Fe{sub 14}B. The hyperfine field at each of the six iron sites decreases sharply with increasing manganese content, with the 8j{sub 1} and 8j{sub 2} sites having the largest and the smallest compositional dependences, respectively.

• OSTI ID: 6288843
• Journal Information: Applied Physics Communications; (USA), Journal Name: Applied Physics Communications; (USA) Vol. 10:1-2; ISSN 0277-9374; ISSN APCOD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BORIDES
BORON COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
EVEN-ODD NUCLEI
HYPERFINE STRUCTURE
INTERMEDIATE MASS NUCLEI
IRON 57
IRON COMPOUNDS
IRON ISOTOPES
ISOTOPES
MAGNESIUM COMPOUNDS
MOESSBAUER EFFECT
NEUTRON DIFFRACTION
NUCLEI
PRASEODYMIUM BORIDES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS