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The room temperature Mossbauer spectra of Fe-57 were measured for iron-based solid solutions Fe1-xCox and Fe1-xNix with x in the range 0.01 <= x <= 0.05. The obtained data were analysed in terms of the binding energy E-b between two Co or Ni atoms in the studied materials using the extended Hrynkiewicz-Krolas idea. It was found that the energy is positive or the non-iron atoms interact repulsively. The extrapolated value of E-b for x = 0 was used for computation of the enthalpy of solution of cobalt and nickel in iron. The results were compared with our previous Mossbauer spectroscopy findings, the values resulting from the Miedema's model of alloys and the data derived from the enthalpy of formation of the Fe-Co and Fe-Ni systems, obtained with calorimetric methods. The comparison shows that the present results are in a qualitative agreement with the Miedema's model predictions and calorimetric measurements but they are at variance with the previous Mossbauer spectroscopy findings.

An Enthalpy of Solution of Cobalt and Nickel in Iron Studied with57Fe Mössbauer Spectroscopy