Abstract
New rare earth metal rich cadmium compoundsRE4CoCd and RE4RhCd (RE = Tb, Dy, Ho) were prepared by high-frequency melting of the elements in sealed tantalum tubes. Thesamples were studied by x-ray powder and single-crystal diffraction. All the compounds crystallizewith Gd4RhIn-type structure, with space group . The structures are built up from rigid three-dimensional networks of condensed, cobalt (rhodium) centredtrigonal RE6 prisms. The voids left by these networks are filled byCd4 cluster units and the coordination number 14 polyhedra of the RE1 atoms. Theterbium and dysprosium compounds in both series undergo antiferromagneticordering, whereas the holmium compounds exhibit ferromagnetic ordering. Themagnetic ordering in these compounds is characterized by broad peaks around thetransition temperatures. The results of detailed crystallographic investigations andpreliminary magnetic and specific heat studies are presented and discussed in this work.
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