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Hyperfine Fields at Fe 57 in Nickel–Manganese Alloys
Author(s) -
Chandra G.,
Radhakrishnan T. S.
Publication year - 1971
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/pssb.2220450228
Subject(s) - hyperfine structure , manganese , alloy , nickel , materials science , analytical chemistry (journal) , stoichiometry , magnetic moment , mössbauer spectroscopy , quenching (fluorescence) , phase (matter) , spectroscopy , condensed matter physics , crystallography , metallurgy , chemistry , atomic physics , physics , organic chemistry , chromatography , quantum mechanics , fluorescence
Co 57 ‐doped alloys of nickel with manganese in the concentration range 0 to 33 at%, have been studied using Mössbauer spectroscopy at 77°K and some higher temperatures. The alloys were suitably heat treated for maximum ordering. The alloys with small Mn concentration showed simple magnetic h.f.s. while the higher concentration alloys exhibited complex behaviour. This is attributed to the co‐existence of long‐range ordered and disordered phases and accordingly these spectra could be resolved into contributions originating from two Fe 57 sites by least squares fitting. A further check was obtained by disordering an alloy near Ni 3 Mn by quenching from 800°C, whereupon a simple h.f. pattern resulted. The Fe 57 hyperfine fields in these alloys as a function of Mn concentration showed no variation except in the case of the long‐range ordered phase near Ni 3 Mn where the field was higher by about 20%. incidentally, the saturation magnetic moment of the alloy also showed a maximum in this region. It is shown that the Co 57 atoms are likely to occupy the nickel sites in the case of the ordered stoichiometric alloy Ni 3 Mn.