Sm3Ga2 crystallizes in the tetragonal I4/mcm space group. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to two equivalent Ga(3) and four equivalent Ga(4) atoms. In the second Sm site, Sm(2) is bonded in a 5-coordinate geometry to two equivalent Ga(4) and three equivalent Ga(3) atoms. In the third Sm site, Sm(3) is bonded in a 6-coordinate geometry to one Ga(1), one Ga(2), one Ga(3), and three equivalent Ga(4) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to eight equivalent Sm(3) atoms. In the second Ga site, Ga(2) is bonded in a body-centered cubic geometry to eight equivalent Sm(3) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), three equivalent Sm(2), and four equivalent Sm(3) atoms. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to one Sm(2), two equivalent Sm(1), six equivalent Sm(3), and one Ga(4) atom.
Sm3Ga2 crystallizes in the tetragonal I4/mcm space group. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to two equivalent Ga(3) and four equivalent Ga(4) atoms. Both Sm(1)-Ga(3) bond lengths are 2.98 Å. There are two shorter (3.11 Å) and two longer (3.76 Å) Sm(1)-Ga(4) bond lengths. In the second Sm site, Sm(2) is bonded in a 5-coordinate geometry to two equivalent Ga(4) and three equivalent Ga(3) atoms. Both Sm(2)-Ga(4) bond lengths are 3.08 Å. There are two shorter (3.38 Å) and one longer (3.68 Å) Sm(2)-Ga(3) bond length. In the third Sm site, Sm(3) is bonded in a 6-coordinate geometry to one Ga(1), one Ga(2), one Ga(3), and three equivalent Ga(4) atoms. The Sm(3)-Ga(1) bond length is 3.06 Å. The Sm(3)-Ga(2) bond length is 3.24 Å. The Sm(3)-Ga(3) bond length is 3.05 Å. There are a spread of Sm(3)-Ga(4) bond distances ranging from 3.15-3.42 Å. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to eight equivalent Sm(3) atoms. In the second Ga site, Ga(2) is bonded in a body-centered cubic geometry to eight equivalent Sm(3) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), three equivalent Sm(2), and four equivalent Sm(3) atoms. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to one Sm(2), two equivalent Sm(1), six equivalent Sm(3), and one Ga(4) atom. The Ga(4)-Ga(4) bond length is 2.78 Å.