Crystal structure of LuCu4−xSb2 (x = 1.053)

Crystal structure of new ternary antimonide LuCu4−xSb2 (x = 1.053(8)) was refined by means of powder diffraction method (diffractometer DRON-3M, Cu Kα-radiation, RB = 4.09, χ2 = 1.92). It crystallizes in orthorhombic type of structure ErFe4Ge2 (low-temperature modification): space group Pnnm, Pearson code oP14-2.11, a = 7.01189(14), b = 7.75061(15), c = 4.24323(8) Å; Z = 2. Analysing the coordination environments of atoms it was shown, that investigated structure is an inclusion derivative of TiO2 structure type. TiO2, NiAs, MnBi, Ag2HgS2, Ni2In and RCu4−xSb2 (R = Tm, Lu) structures belongs to the family of structures built up from the columns of filled octahedra and differ by the filling of space between them by different atoms or groups of atoms.