Magnetic moments and Curie temperatures of σ-FeCr alloys

Abstract Magnetization and Mossbauer-effect measurements were carried out as a function of temperature and external magnetic field of up to 15 T on σ-Fe100−xCrx (45⩽x⩽50) samples. Average magnetic moment per Fe atom, 〈μ〉, and the Curie temperature, TC, were determined. Both of them were found to linearly decrease with x: the former at the rate of 0.033 μB/at% and the latter at 6.7 K/at%. The results are compared with those from the literature and are discussed in terms of localized and band models.