MOSSBAUER-SPECTROSCOPY STUDY OF 3D-MAGNETIC PROPERTIES UFE10SI2

Fe-57 Mossbauer spectra of UFe10Si2, a ferromagnet with a Curie temper ature of 640 K, have been studied in the temperature range of 5-643 K. The distribution of Fe atoms on the crystallographic sites and the te mperature dependence of the hyperfine fields, quadrupole and isomer sh ifts for the Fe atoms on each site have been derived. A linear decreas e of the hyperfine fields with increasing cubic temperature has been f ound. The influence of the atomic arrangement on the site magnetic pro perties is discussed in terms of the mean field model and the Fe-Fe in tersite exchange interactions have been evaluated. (C) 1997 Elsevier S cience Ltd.