Concentration dependence of atomic short-range order in FeCo alloys (xCo⩽25%) from neutron diffuse scattering

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Abstract
Measurements of neutron diffuse scattering have been carried out at 77K in five FeCo alloys (up to 25 at.% Co) which were in a state of thermodynamic equilibrium at 773K. Significant values of short-range order parameters have been obtained for only three alloys (10, 15 and 20 at.%). They display a monotonic increase as a function of the concentration and are in qualitative agreement with values deduced from NMR experiments in the dilute regime. These results have been interpreted in the mean-field approximation in terms of effective interaction potentials which are found to be attractive between third-nearest-neighbour (NN) Co atoms and repulsive for the other cobalt pairs within the five NN shells.