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The germanides RE3Pt4Ge6 (RE=Y, Pr, Nd, Sm, Gd–Dy) have been synthesized by arc-melting of the elements followed by inductive annealing to improve the crystallinity and allow for structural order. The compounds have been studied by powder X-ray diffraction; additionally the structure of Y3Pt4Ge6 has been refined from single-crystal X-ray diffractometer data. It exhibits a (3+1)D modulated structure, indicating isotypism with Ce3Pt4Ge6. The crystal structure can be described as an intergrowth between YIrGe2- and CaBe2Ge2-type slabs along [100]. Temperature-dependent magnetic susceptibility measurements showed Pauli paramagnetism for Y3Pt4Ge6 and Curie-Weiss paramagnetism for Pr3Pt4Ge6 and Nd3Pt4Ge6. Sm3Pt4Ge6 exhibits van Vleck paramagnetism, while antiferromagnetic ordering at TN=8.1(1) K and TN=11.0(1) K is observed for Gd3Pt4Ge6 and Tb3Pt4Ge6, respectively.

Abstract. In order to investigate the magnetic properties of the solid solution CePt 1-x Pd x Al the individual compounds were synthesized from the elements using an arc furnace. From x = 0-0.8 the solid solution crystallizes in the orthorhombic TiNiSi-type structure (Pnma, no. 62;(721)(722) and for x = 0.9 both the TiNiSi-as well as the hexagonal ZrNiAl-type structures

Structural reinvestigations of Ce3Pt4Ge6revealed additional reflections justifying the orthorhombic (3 + 1)D superspace groupCmcm(α,0,0)0s0 withα= 0.5a*.