RE6Pd13Zn4 (RE = La-Nd, Sm, Gd, Tb) – New Palladium-rich Phases with Pd@RE6 Octahedra in bcc Packing†

The intermetallic zinc compounds RE6Pd13Zn4 (RE = La – Nd, Sm, Gd, Tb) were synthesized from the elements in sealed niobium ampoules. They crystallize with the cubic Na16Ba6N (Dy6Fe16O) type structure, space group Imm. The samples were investigated by powder X-ray diffraction and four structures were refined on the basis of single-crystal X-ray diffraction data. The striking structural motifs are palladium centered RE6 octahedra in a bcc arrangement. These octahedra are surrounded by a [Pd12Zn4] network. Magnetic susceptibility studies of Gd6Pd13Zn4 show Curie-Weiss behavior and an experimental magnetic moment of 7.75(2) μB per Gd atom. Gd6Pd13Zn4 orders antiferromagnetically at TN = 10.5(1) K.

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