Magnetic properties and Mössbauer effect studies of Ce 1− xSc xFe 4 Al 8 system

Abstract

The investigations of the magnetic and electrical properties as well as the 57Fe Mössbauer effect are presented for Ce 1− x Sc x Fe 4Al 8 solid solution with 0< x<1 in the temperature range 4–300 K. Magnetic susceptibility follows a Curie–Weiss law above 200 K. The effective magnetic moment decreases with the Sc content. At temperatures lower than 130 K all compounds studied are antiferromagnets. The Néel temperature, T N is not affected by substitution of Sc for Ce. T N has no reflection in any anomaly in ρ( T). The Mössbauer spectra at temperatures lower than T N exhibit one Zeeman sextet related to the Fe nucleus at the 8(f) position. The hyperfine parameters H hf, IS, QS have been estimated as a function of Sc concentration. The increasing of Sc content diminishes H hf on the Fe nucleus. The calculations of electron-density distribution along the 1 1 1 direction in elemental crystallographic cell indicate a remarkable increase of electron charge at the Fe sites with the Sc content increasing. The 40–49° cone angles of the Fe sublattices at 12 K have been estimated from Mössbauer spectra analysis.