Abstract
By means of M\ossbauer spectroscopy we studied the structural order in a series of stoichiometric ${\mathrm{Ni}}_{3}$Fe foils, which had been given different heat treatments. The long-range-order parameter $\ensuremath{\eta}$ was determined with an accuracy of \ifmmode\pm\else\textpm\fi{}0.02 by analyzing the profiles of the outer lines of $^{57}\mathrm{Fe}$ absorption spectra, recorded at room temperature. From the analysis it appeared that the hyperfine field at $^{57}\mathrm{Fe}$ nuclei depends linearly on the numbers of iron atoms in the first and second neighboring shell, and that contributions from more distant atoms are negligible. Further anisotropic hyperfine interactions in ${\mathrm{Ni}}_{3}$Fe are small. A comparison with $\ensuremath{\eta}$ as determined from x-ray diffraction indicates that the wrongly placed atoms in partly ordered ${\mathrm{Ni}}_{3}$Fe are distributed at random over the lattice sites.
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