Enthalpy of Solution of Rhodium in Iron Studied by 57Fe Mössbauer Spectroscopy

R. Konieczny, M. Sobota, R. Idczak Institute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland

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The room temperature Mössbauer spectra of 57Fe were measured for Fe1-xRhx solid solutions with x in the range 0.01≤x≤0.06. The obtained data were analysed in terms of the binding energy Eb between two rhodium atoms in the studied materials using the extended Hrynkiewicz-Królas model. The extrapolated value of Eb for x=0 was used to compute the enthalpy HFe-Rh of solution of Rh in the α-iron matrix. It was found that the enthalpy HFe-Rh value is negative and rhodium atoms interact repulsively. The result was compared with the value derived from Miedema's cellular atomic model of alloys.

DOI:10.12693/APhysPolA.146.239 topics: Mössbauer spectroscopy, hyperfine parameters, binding energy, enthalpy of solution in binary iron alloys