Abstract
The title compounds were prepared from the elemental components by arc-melting and subsequent annealing at 1020 K and 1170 K. Both CePd 0.63Ge 1.37 and CeAu 0.75Ge 1.25 crystallize in the AlB 2 structure type with a statistical distribution of the transition metal and germanium atoms on the boron site. The structure of CeAu 0.75Ge 1.25 was refined from single crystal X-ray data: P6/mmm, a=433.5(1) pm, c=422.6(1) pm, V=0.0688(1) nm 3, Z=1, wR2=0.0504 for 157 F 2 values and 7 variables. Magnetic susceptibility data for both compounds show a full cerium moment and ferromagnetic ordering at 6.0(5) K for CeAu 0.75Ge 1.25 and 3.0(5) K for CePd 0.63Ge 1.37. The crystal structure and properties of CeAu 0.75Ge 1.25 are compared with those of equiatomic CeAuGe which adopts the NdPtSb structure type, an ordered variant of AlB 2.
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