M\"ossbauer spectroscopic study of a sigma-Fe65.9V34.1 alloy: Curie and Debye temperatures

Sigma-phase Fe65.9V34.1 alloy was investigated with the M\"ossbauer spectroscopy. M\"ossbauer spectra were recorded in the temperature interval of 80-300 K. Their analysis in terms of the hyperfine distribution protocol yielded the average hyperfine field, <B>, the average center shift, <CS>, and the spectral area, A. The magnetic ordering temperature, T_C=312.5(5) K was determined from the temperature dependence of <B>, and the Debye temperature, T_D, from the temperature dependence of <CS> and the relative spectral area. The value obtained from the former was 403(17) K and that from the latter 374(2) K. The value of the force constant was determined. The lattice dynamics of Fe atoms was described in terms of the kinetic, E_k, and the potential energy, E_p.