The crystal structure of a new ternary antimonide: TmCu4−xSb2 (x = 1.065)

The crystal structure of the new ternary compound TmCu4−xSb2 (x = 1.065) was determined by direct methods from X-ray powder data (diffractometer DRON-3M, Cu Kα-radiation). It crystallizes with the orthorhombic structure type ErFe4Ge2 (low-temperature modification) and is the first representative of this structure type among known antimonides: space group Pnnm, Pearson code oP14-2.13, a = 7.00565(6) Å, b = 7.83582(6) Å, c = 4.25051(3) Å, Z = 2. Investigated structure is an orthorhombically deformed derivative of the ZrFe4Si2 structure type.