Sm3Ga2Sn3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to four equivalent Ga(1), one Sn(2), and four equivalent Sn(1) atoms. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to four equivalent Ga(1), two equivalent Sn(2), and four equivalent Sn(1) atoms. Ga(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ga(1), one Sn(2), and two equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), two equivalent Ga(1), and one Sn(2) atom. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Sm(1), four equivalent Sm(2), two equivalent Ga(1), and two equivalent Sn(1) atoms.
Sm3Ga2Sn3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to four equivalent Ga(1), one Sn(2), and four equivalent Sn(1) atoms. There are two shorter (2.97 Å) and two longer (3.31 Å) Sm(1)-Ga(1) bond lengths. The Sm(1)-Sn(2) bond length is 3.10 Å. There are two shorter (3.23 Å) and two longer (3.42 Å) Sm(1)-Sn(1) bond lengths. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to four equivalent Ga(1), two equivalent Sn(2), and four equivalent Sn(1) atoms. There are two shorter (3.28 Å) and two longer (3.34 Å) Sm(2)-Ga(1) bond lengths. Both Sm(2)-Sn(2) bond lengths are 3.22 Å. There are two shorter (3.16 Å) and two longer (3.45 Å) Sm(2)-Sn(1) bond lengths. Ga(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ga(1), one Sn(2), and two equivalent Sn(1) atoms. The Ga(1)-Ga(1) bond length is 3.02 Å. The Ga(1)-Sn(2) bond length is 3.12 Å. Both Ga(1)-Sn(1) bond lengths are 2.88 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), two equivalent Ga(1), and one Sn(2) atom. The Sn(1)-Sn(2) bond length is 2.92 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Sm(1), four equivalent Sm(2), two equivalent Ga(1), and two equivalent Sn(1) atoms.