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The ternary stannides RE 2 Au 2 Sn (RE = Y, Dy, Ho, Er, Tm, Lu) were prepared by arcmelting of the elemental components and subsequent annealing at 800 °C. The structure of Er 2 Au 2 Sn (single crystal, X-ray, P4 2 /mnm, Z = 4, a = 778.2(2) pm, c = 739.6(3) pm, V = 0.4479 nm 3  and R = 0.026) is described as the ternary ordered version of the Zr 3 Al 2 -type structure, a superstructure of the U 3 Si 2 -type. It consists of two-dimensionally infinite layers (Au 2 Sn) n  which are separated by the erbium atoms. The structure is built up from slightly distorted [SnEr 8 ) square prisms and [AuEr 6 ] trigonal prisms which are condensed in all three directions. These fragments are derived from the well known AlB 2  and CsCl-type structures.

Er 2 Au 2 Sn and other Ternary Rare Earth Metal Gold Stannides with Ordered Zr 3 Al 2 -Type Structure