Al4Sm crystallizes in the orthorhombic Imma space group. Sm(1) is bonded in a 13-coordinate geometry to three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(3) is bonded in a 10-coordinate geometry to three equivalent Sm(1), one Al(1), three equivalent Al(2), and three equivalent Al(3) atoms. In the second Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Sm(1) and two equivalent Al(3) atoms. In the third Al site, Al(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Al(3) atoms.
Al4Sm crystallizes in the orthorhombic Imma space group. Sm(1) is bonded in a 13-coordinate geometry to three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. There is one shorter (3.13 Å) and two longer (3.19 Å) Sm(1)-Al(2) bond lengths. All Sm(1)-Al(1) bond lengths are 3.15 Å. There are four shorter (3.12 Å) and two longer (3.18 Å) Sm(1)-Al(3) bond lengths. There are three inequivalent Al sites. In the first Al site, Al(3) is bonded in a 10-coordinate geometry to three equivalent Sm(1), one Al(1), three equivalent Al(2), and three equivalent Al(3) atoms. The Al(3)-Al(1) bond length is 2.73 Å. There are two shorter (2.83 Å) and one longer (2.90 Å) Al(3)-Al(2) bond length. There are two shorter (2.64 Å) and one longer (2.66 Å) Al(3)-Al(3) bond length. In the second Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Sm(1) and two equivalent Al(3) atoms. In the third Al site, Al(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Al(3) atoms.