A new ternary compound DyGeSi 0.75 was found in the system Dy-Ge-Si. The crystal structure of the compound was determined by X-ray powder diffraction (Fe Kα radiation). The refined composition was DyGe 1.02(2) Si 0.73(2) and the structure type α-ThSi 2 , space group I4 1 /amd, Pearson symbol tI12, a = 4.052(3), c = 13.6207(10) Å, V = 221.78(3) Å 3 , R B = 0.1011. Rare earth / Germanium / Silicon / X-ray powder diffraction / Crystal structure