MAGNETIC-PROPERTIES OF SEVERAL CE(2)T(2)M PHASES WITH T=NI, PD AND M=IN, SN, PB

Four new ternary intermetallic compounds were prepared: Ce2Pd2In, Ce2P d2Sn, Ce2Pd2Pb and Ce2Ni2Sn. The first three are isotypic, adopting th e tetragonal U3Si2 structure. The structure of Ce,Ni,Sn is of the orth orhombic Mo2CoB2 type, but extensive solid solutions occur between it and Ce,Pd,Sn. Magnetic susceptibility measurements were performed on e ach ternary and the known Ce2Ni2In phase. Cerium is tetravalent in Ce, Ni,In and trivalent in the remaining phases at room temperature. Kondo behaviour is present in Ce2Ni2Sn with T-K near 9 K. Ferromagnetic beh aviour with T-c near 4.2 K is seen in both Ce2Pd2In and Ce2Pd2Sn. Anti -ferromagnetic ordering is observed in Ce2Pd2Pb with a Neel temperatur e of 6.2 K. An apparently second-order transition involving a reductio n in the effective cerium moment also occurs in Ce2Pd2Pb at 120 K.