HfOsSi crystallizes in the hexagonal P-62m space group. Hf(1) is bonded in a 11-coordinate geometry to six equivalent Os(1), one Si(2), and four equivalent Si(1) atoms. Os(1) is bonded in a 12-coordinate geometry to six equivalent Hf(1), two equivalent Os(1), two equivalent Si(1), and two equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Hf(1) and three equivalent Os(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Hf(1) and six equivalent Os(1) atoms.
HfOsSi crystallizes in the hexagonal P-62m space group. Hf(1) is bonded in a 11-coordinate geometry to six equivalent Os(1), one Si(2), and four equivalent Si(1) atoms. There are two shorter (2.86 Å) and four longer (3.02 Å) Hf(1)-Os(1) bond lengths. The Hf(1)-Si(2) bond length is 2.74 Å. All Hf(1)-Si(1) bond lengths are 2.70 Å. Os(1) is bonded in a 12-coordinate geometry to six equivalent Hf(1), two equivalent Os(1), two equivalent Si(1), and two equivalent Si(2) atoms. Both Os(1)-Os(1) bond lengths are 2.81 Å. Both Os(1)-Si(1) bond lengths are 2.51 Å. Both Os(1)-Si(2) bond lengths are 2.46 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Hf(1) and three equivalent Os(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Hf(1) and six equivalent Os(1) atoms.