DOE OSTI2020
Al13Os4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Os sites. In the first Os site, Os is bonded in a 10-coordinate geometry to ten Al atoms. There are a spread of Os–Al bond distances ranging from 2.56–2.72 Å. In the second Os site, Os is bonded in a 11-coordinate geometry to eleven Al atoms. There are a spread of Os–Al bond distances ranging from 2.48–2.87 Å. There are seven inequivalent Al sites. In the first Al site, Al is bonded in a 3-coordinate geometry to three Os atoms. In the second Al site, Al is bonded in a 3-coordinate geometry to three equivalent Os and one Al atom. The Al–Al bond length is 2.63 Å. In the third Al site, Al is bonded in a distorted trigonal planar geometry to three Os and two equivalent Al atoms. Both Al–Al bond lengths are 2.77 Å. In the fourth Al site, Al is bonded in a 3-coordinate geometry to three Os and two equivalent Al atoms. Both Al–Al bond lengths are 2.66 Å. In the fifth Al site, Al is bonded in a 2-coordinate geometry to three equivalent Os and one Al atom. The Al–Al bond length is 2.94 Å. In the sixth Al site, Al is bonded in a 2-coordinate geometry to four Os and seven Al atoms. The Al–Al bond length is 2.73 Å. In the seventh Al site, Al is bonded in a 12-coordinate geometry to four equivalent Os atoms.