Magnetic properties and Mossbauer effect studies of Ce1-xScxFe4Al8 system

The investigations of the magnetic and electrical properties as well as the Fe-57 Mossbauer effect are presented for Ce1-xScxFe4Al8 solid solution wit h 0 < x < 1 in the temperature range 4-300 K. Magnetic susceptibility follo ws a Curie-Weiss law above 200 K. The effective magnetic moment decreases w ith the Sc content. At temperatures lower than 130 K all compounds studied are antiferromagnets. The Neel temperature, T-N is not affected by substitu tion of Sc for Ce. T-N has no reflection in any anomaly in rho(T). The Moss bauer spectra at temperatures lower than T-N exhibit one Zeeman sextet rela ted 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 increasin g of Sc content diminishes H-hf on the Fe nucleus. The calculations of elec tron-density distribution along the [1 1 1] direction in elemental crystall ographic cell indicate a remarkable increase of electron charge at the Fe s ites with the Sc content increasing. The 40-49 degrees cone angles of the F e sublattices at 12 K have been estimated from Mossbauer spectra analysis. (C) 2000 Elsevier Science B.V. All rights reserved.