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SmAl is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sm is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Sm–Al bond lengths are 3.18 Å. Al is bonded in a body-centered cubic geometry to eight equivalent Sm atoms.
SmAl crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 2-coordinate geometry to eight Al atoms. There are a spread of Sm–Al bond distances ranging from 3.13–3.43 Å. In the second Sm site, Sm is bonded in a 6-coordinate geometry to eight Al atoms. There are a spread of Sm–Al bond distances ranging from 3.13–3.57 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to eight Sm and two equivalent Al atoms. Both Al–Al bond lengths are 2.75 Å. In the second Al site, Al is bonded to eight Sm and four Al atoms to form a mixture of distorted corner, edge, and face-sharing AlSm8Al4 cuboctahedra. Both Al–Al bond lengths are 2.85 Å.
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