The crystal structure of the new ternary antimonide Dy3Cu20+xSb11−x (x≈2)

The crystal structure of the new ternary antimonide Dy3Cu20+xSb11−x (x≈2) was determined by direct methods from X-ray powder diffraction data. It crystallizes with the own cubic structure type: space group F4¯3m, Pearson code cF272, a=16.6150(2)Å,Z=8. Investigated structure is derived from the structure type BaHg11 by doubling of the lattice parameter and subtraction of 16 atoms. The relationships between structure types Dy3Cu20+xSb11−x, BaHg11, Ce3Pt23Si11, Tl4Ag18Te11, Ce3Pt23Ge11 and TmNi2 were discussed.