Thermodynamic properties of dilute Co-Fe solid solutions studied by ⁵⁷Fe Mössbauer spectroscopy

Abstract

Abstract. The Co 1-x Fe x alloys where x ranges from 0.01 to 0.06 were measured at room temperature using transmission Mössbauer spectroscopy (TMS). The analysis of the obtained data allowed the determination of the short-range order (SRO), the binding energy E b between two iron atoms in the studied materials using the extended Hrynkiewicz-Królas idea and the enthalpy of solution H Co-Fe of Fe in Co. The results showed that the Fe atoms dissolved in a Co matrix interact repulsively and the estimated value of H Co-Fe = -0.166(33) eV/atom. Finally, values of the enthalpy of solution were used to predict the enthalpy of mixing for the Co-Fe system. These fi ndings were compared with corresponding data given in the literature, which were derived from calorimetric experiments and from the cellular atomic model of alloys described by Miedema.

Metallurgical Wastes as Resources for Sustainability of the Steel Industry

“…Therefore, the analysis of these spectra is usually performed after chemical analysis, which orientates the search of the pattern peaks and leads to the identification of the sample structures. The minerals' investigation by X-ray diffraction can detect traces of crystalline phases up to 1% by mass [24,25,28,29].…”

“…Studies on the phase composition of metallurgical wastes are very important in order to recover metals from wastes or to return them to the metallurgical process [23,24].…”

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“…The TMS technique is especially powerful when the appearance of impurity atoms in the vicinity of the Mössbauer probe have a sufficiently large effect on the hyperfine field generated at the probe, to yield distinguishable components in the Mössbauer spectrum. Basing on the distributions of iron atoms in the studied materials, which is related to the intensities of the Mössbauer spectrum components one can determine for example the shortrange order (SRO) parameter [13,14], the binding energy E b between two impurity atoms [15] and the enthalpy of solution H Fe-D of elements -D in the ferromagnetic * corresponding author; e-mail: robi@ifd.uni.wroc.pl matrix [16]. These last one is widely used in developing and testing different models of binary alloys as well as methods for calculating the alloy parameters [8][9][10].…”