CRYSTAL-STRUCTURE AND MAGNETIC-SUSCEPTIBILITY OF CE8PD24SB

The ternary compound Ce8Pd24Sb is very close in composition to the int ermediate valent binary CePd3. A single crystal study yielded a cubic cell with a = 8.461(1)Angstrom, <Pm(3)over bar m> symmetry with wR2 = 0.0412 based on 1453 reflections (222 unique) and 16 parameters. This new structure type is composed of distorted perovskite and Cu3Au subce lls arranged with the perovskite-like units centred on the corners of the cube. Fitting the magnetic susceptibility data above 100K to a Cur ie-Weiss expression yielded a Weiss constant of -15(3)K (antiferromagn etic) and an effective high temperature moment per cerium of 2.45(4)mu B indicating trivalent cerium. No ordering was observed above 3K.