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Local Site Symmetry of the Co( 57 Fe) Sublattice in a Nd–Co( 57 Fe)–Si–B Phase — Mössbauer Investigation
Author(s) -
Wu E.,
Zhang H.,
Campbell S.J.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199806)207:2<485::aid-pssb485>3.0.co;2-4
Subject(s) - hyperfine structure , mössbauer spectroscopy , quadrupole , quadrupole splitting , phase (matter) , symmetry (geometry) , spectral line , chemistry , materials science , condensed matter physics , crystallography , atomic physics , physics , geometry , mathematics , organic chemistry , astronomy
Analysis of the room temperature and 4.2 K Mssbauer spectra of a quaternary Nd–Co–Si–B phase doped with 57 Fe is presented. A predominant single line is observed at room temperature indicating a high symmetry Co sublattice. This has led to a model for the structure of the phase based on a f.c.c.‐like symmetry sublattice. The analysis indicates that the single line is the result of a preferred occupancy of the 57 Fe atoms in high symmetry 2 c sites in the structure. The 57 Fe doped compound has a magnetic ordering temperature of T c ≈ 170 K as determined by a thermal scan of the Mössbauer resonance with a predominant magnetic hyperfine field of 〈 B hf 〉 ≈ 28 T and electric quadrupole interaction ≈0 mm/s at 4.2 K. The site location of the remaining 57 Fe atoms which are identified by a quadrupole doublet (area ≈20%, QS ≈ 0.7 mm/s) at room temperature and a corresponding magnetically split subspectrum of 〈 B hf 〉 ≈ 15 T at 4.2 K is also discussed.