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OsHf is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to eight equivalent Os atoms. All Hf–Os bond lengths are 2.82 Å. Os is bonded in a body-centered cubic geometry to eight equivalent Hf atoms.
Hf54Os17 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are twelve inequivalent Hf sites. In the first Hf site, Hf is bonded in a 1-coordinate geometry to one Hf and four Os atoms. The Hf–Hf bond length is 3.27 Å. There are a spread of Hf–Os bond distances ranging from 2.86–3.13 Å. In the second Hf site, Hf is bonded in a distorted linear geometry to two Os atoms. There are one shorter (2.85 Å) and one longer (2.91 Å) Hf–Os bond lengths. In the third Hf site, Hf is bonded in a distorted linear geometry to two Os atoms. There are one shorter (2.71 Å) and one longer (2.91 Å) Hf–Os bond lengths. In the fourth Hf site, Hf is bonded in a 2-coordinate geometry to eleven Hf and four Os atoms. There are a spread of Hf–Hf bond distances ranging from 3.02–3.25 Å. There are two shorter (3.04 Å) and two longer (3.28 Å) Hf–Os bond lengths. In the fifth Hf site, Hf is bonded in a 1-coordinate geometry to four Os atoms. There are a spread of Hf–Os bond distances ranging from 2.98–3.19 Å. In the sixth Hf site, Hf is bonded in a 1-coordinate geometry to four Os atoms. There are a spread of Hf–Os bond distances ranging from 2.62–3.03 Å. In the seventh Hf site, Hf is bonded in a distorted linear geometry to two Os atoms. There are one shorter (2.55 Å) and one longer (2.91 Å) Hf–Os bond lengths. In the eighth Hf site, Hf is bonded in a 1-coordinate geometry to one Hf and two Os atoms. There are one shorter (2.65 Å) and one longer (3.04 Å) Hf–Os bond lengths. In the ninth Hf site, Hf is bonded in a 4-coordinate geometry to four Os atoms. There are two shorter (2.83 Å) and two longer (3.12 Å) Hf–Os bond lengths. In the tenth Hf site, Hf is bonded in a 12-coordinate geometry to two equivalent Hf and five Os atoms. There are a spread of Hf–Os bond distances ranging from 2.72–2.87 Å. In the eleventh Hf site, Hf is bonded in a 4-coordinate geometry to four Os atoms. There are a spread of Hf–Os bond distances ranging from 2.71–2.80 Å. In the twelfth Hf site, Hf is bonded in a distorted linear geometry to two equivalent Os atoms. Both Hf–Os bond lengths are 2.78 Å. There are six inequivalent Os sites. In the first Os site, Os is bonded in a 12-coordinate geometry to ten Hf and two equivalent Os atoms. Both Os–Os bond lengths are 2.86 Å. In the second Os site, Os is bonded in a 12-coordinate geometry to eleven Hf and one Os atom. In the third Os site, Os is bonded in a 12-coordinate geometry to eleven Hf and one Os atom. The Os–Os bond length is 2.95 Å. In the fourth Os site, Os is bonded in a 9-coordinate geometry to nine Hf atoms. In the fifth Os site, Os is bonded in a 12-coordinate geometry to ten Hf and two equivalent Os atoms. In the sixth Os site, Os is bonded in a cuboctahedral geometry to twelve Hf atoms.
HfOs2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Hf4+ is bonded in a 12-coordinate geometry to twelve Os2- atoms. There are a spread of Hf–Os bond distances ranging from 3.05–3.07 Å. There are two inequivalent Os2- sites. In the first Os2- site, Os2- is bonded to six equivalent Hf4+ and six equivalent Os2- atoms to form a mixture of corner, edge, and face-sharing OsHf6Os6 cuboctahedra. All Os–Os bond lengths are 2.65 Å. In the second Os2- site, Os2- is bonded to six equivalent Hf4+ and six Os2- atoms to form a mixture of corner, edge, and face-sharing OsHf6Os6 cuboctahedra. There are two shorter (2.51 Å) and two longer (2.71 Å) Os–Os bond lengths.
HfOs3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf4+ is bonded to twelve equivalent Os+1.33- atoms to form a mixture of corner and face-sharing HfOs12 cuboctahedra. All Hf–Os bond lengths are 2.81 Å. Os+1.33- is bonded in a distorted square co-planar geometry to four equivalent Hf4+ atoms.
Hf2Os crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 6-coordinate geometry to six equivalent Os atoms. All Hf–Os bond lengths are 2.72 Å. In the second Hf site, Hf is bonded in a 2-coordinate geometry to four equivalent Os atoms. There are two shorter (2.82 Å) and two longer (3.15 Å) Hf–Os bond lengths. Os is bonded in a 9-coordinate geometry to nine Hf atoms.