STRUCTURE AND MAGNETIC-PROPERTIES OF CEFE13-XSIX COMPOUNDS

New iron-based rare-earth CeFe13-xSix (2.4 less than or equal to x les s than or equal to 2.6) intermetallic compounds which crystallized in the NaZn13-type structure with Fm3c(O-h(6)) space-group symmetry have been found. The ac susceptibility and the magnetization curve measurem ents are reported. The substitution of silicon for iron leads to an in crease of the Curie temperature and a reduction of the unit-cell volum e. The saturation magnetic moment decreases from 15.7 mu(beta)/f.u. to 13.4 mu(beta)/f.u. with x=2.4-2.6. (C) 1995 American Institute of Phy sics.