Ga3Sm5 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 5-coordinate geometry to two equivalent Ga(2) and three equivalent Ga(1) atoms. In the second Sm site, Sm(2) is bonded to one Ga(2) and four equivalent Ga(1) atoms to form distorted corner-sharing SmGa5 square pyramids. There are two inequivalent Ga sites. In the first Ga site, Ga(2) is bonded in a 9-coordinate geometry to one Sm(2) and eight equivalent Sm(1) atoms. In the second Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), six equivalent Sm(1), and one Ga(1) atom.
Ga3Sm5 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 5-coordinate geometry to two equivalent Ga(2) and three equivalent Ga(1) atoms. There is one shorter (3.16 Å) and one longer (3.34 Å) Sm(1)-Ga(2) bond length. There are a spread of Sm(1)-Ga(1) bond distances ranging from 3.06-3.19 Å. In the second Sm site, Sm(2) is bonded to one Ga(2) and four equivalent Ga(1) atoms to form distorted corner-sharing SmGa5 square pyramids. The Sm(2)-Ga(2) bond length is 3.09 Å. All Sm(2)-Ga(1) bond lengths are 3.13 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(2) is bonded in a 9-coordinate geometry to one Sm(2) and eight equivalent Sm(1) atoms. In the second Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), six equivalent Sm(1), and one Ga(1) atom. The Ga(1)-Ga(1) bond length is 2.62 Å.