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57 Fe Mössbauer Lineshapes in Disordered Ni 3 /Mn
Author(s) -
Ray J.,
Radhakrishnan T. S.,
Bansal C.,
Chanura G.
Publication year - 1974
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.2220640139
Subject(s) - hyperfine structure , spectral line , atom (system on chip) , mössbauer spectroscopy , atmospheric temperature range , line (geometry) , atomic physics , superposition principle , range (aeronautics) , doping , materials science , mössbauer effect , physics , chemistry , condensed matter physics , crystallography , thermodynamics , quantum mechanics , mathematics , geometry , computer science , composite material , embedded system
Mössbauer studies of 57 Co doped disordered Ni 3 Mn are presented in the temperature range 77 to 500 K. The spectra consist of a well resolved six‐line pattern a t 77 K, becoming complex and showing hyperfine structure at higher temperatures, and finally collapsing t o a single line around 473 K. 57 Fe Mössbauer line shapes in disordered Ni 3 Mn have been computed in this temperature range using a model which assigns an average exchange integral to an atom depending on its nearest neighbour (nn) atoms. Owing to the distribution of T c of the various nn configuration clusters for a given central atom, there is a distribution in hyperfine fields, and the spectrum a t any temperature is the superposition of the different fields suitably weighted. The spectra simulated basing on this model agree with the experimental spectra.