Ga3Sm5 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to two equivalent Ga(1) and four equivalent Ga(2) atoms. In the second Sm site, Sm(2) is bonded to two equivalent Ga(1) and three equivalent Ga(2) atoms to form a mixture of distorted edge, face, and corner-sharing SmGa5 trigonal bipyramids. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1) and eight equivalent Sm(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), six equivalent Sm(2), and one Ga(2) atom.
Ga3Sm5 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to two equivalent Ga(1) and four equivalent Ga(2) atoms. Both Sm(1)-Ga(1) bond lengths are 3.61 Å. All Sm(1)-Ga(2) bond lengths are 3.10 Å. In the second Sm site, Sm(2) is bonded to two equivalent Ga(1) and three equivalent Ga(2) atoms to form a mixture of distorted edge, face, and corner-sharing SmGa5 trigonal bipyramids. Both Sm(2)-Ga(1) bond lengths are 3.23 Å. All Sm(2)-Ga(2) bond lengths are 3.14 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1) and eight equivalent Sm(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), six equivalent Sm(2), and one Ga(2) atom. The Ga(2)-Ga(2) bond length is 2.59 Å.