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, Ce2Pd2Sn, Ce2Pd2Pb and Ce2Ni2Sn. The first three are isotypic, adopting the tetragonal U3Si2 structure. The structure of Ce,Ni,Sn is of the orthorhombic Mo2CoB2 type, but extensive solid solutions occur between it and Ce,Pd,Sn. Magnetic susceptibility measurements were performed on each 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 behaviour with T-c near 4.2 K is seen in both Ce2Pd2In and Ce2Pd2Sn. Anti-ferromagnetic ordering is observed in Ce2Pd2Pb with a Neel temperature of 6.2 K. An apparently second-order transition involving a reduction in the effective cerium moment also occurs in Ce2Pd2Pb at 120 K.