Sm8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. In the second Sm site, Sm(2) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted corner-sharing SmGa3Co tetrahedra. The corner-sharing octahedral tilt angles range from 13-48°. In the third Sm site, Sm(3) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. In the fourth Sm site, Sm(4) is bonded to six equivalent Ga(1) atoms to form distorted SmGa6 octahedra that share corners with six equivalent Sm(2)Ga3Co tetrahedra and faces with two equivalent Sm(4)Ga6 octahedra. Co(1) is bonded in a 7-coordinate geometry to one Sm(2), three equivalent Sm(1), and three equivalent Sm(3) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Sm(2), two equivalent Sm(4), four equivalent Sm(1), and four equivalent Sm(3) atoms.
Sm8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. The Sm(1)-Co(1) bond length is 2.93 Å. There are a spread of Sm(1)-Ga(1) bond distances ranging from 3.02-3.73 Å. In the second Sm site, Sm(2) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted corner-sharing SmGa3Co tetrahedra. The corner-sharing octahedral tilt angles range from 13-48°. The Sm(2)-Co(1) bond length is 2.73 Å. All Sm(2)-Ga(1) bond lengths are 3.18 Å. In the third Sm site, Sm(3) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. The Sm(3)-Co(1) bond length is 2.84 Å. There are two shorter (3.24 Å) and two longer (3.81 Å) Sm(3)-Ga(1) bond lengths. In the fourth Sm site, Sm(4) is bonded to six equivalent Ga(1) atoms to form distorted SmGa6 octahedra that share corners with six equivalent Sm(2)Ga3Co tetrahedra and faces with two equivalent Sm(4)Ga6 octahedra. All Sm(4)-Ga(1) bond lengths are 3.42 Å. Co(1) is bonded in a 7-coordinate geometry to one Sm(2), three equivalent Sm(1), and three equivalent Sm(3) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Sm(2), two equivalent Sm(4), four equivalent Sm(1), and four equivalent Sm(3) atoms.