Two new compounds, β-ScTe and Y3Au2, and a reassessment of Y2Au

Two new compounds, beta-ScTe (scandium telluride) and Y3Au2 (triyttrium digold), have been synthesized by high-temperature solid-state techniques and their crystal structures, along with that of Y2Au (diyttrium gold), have been refined by single-crystal X-ray diffraction methods. beta-ScTe is a superstructure of ScTe (NiAs-type), featuring double hexagonal close-packed layers of Te atoms with the octahedral cavities filled by Sc atoms. Y3Au2 displays a U3Si2-type structure and is built from Au-2-centered bitrigonal prisms and centered cubes of Y atoms. The structure of Y2Au is better described as an inverse PbCl2-type structure rather than a Co2Si-type.