La5Ga3 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded to one Ga(2) and four equivalent Ga(1) atoms to form distorted corner-sharing LaGa5 square pyramids. In the second La site, La(2) is bonded in a 5-coordinate geometry to two equivalent Ga(2) and three equivalent Ga(1) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent La(1), six equivalent La(2), and one Ga(1) atom. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to one La(1) and eight equivalent La(2) atoms.
La5Ga3 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded to one Ga(2) and four equivalent Ga(1) atoms to form distorted corner-sharing LaGa5 square pyramids. The La(1)-Ga(2) bond length is 3.11 Å. All La(1)-Ga(1) bond lengths are 3.28 Å. In the second La site, La(2) is bonded in a 5-coordinate geometry to two equivalent Ga(2) and three equivalent Ga(1) atoms. There is one shorter (3.25 Å) and one longer (3.45 Å) La(2)-Ga(2) bond length. There are a spread of La(2)-Ga(1) bond distances ranging from 3.17-3.29 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent La(1), six equivalent La(2), and one Ga(1) atom. The Ga(1)-Ga(1) bond length is 2.65 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to one La(1) and eight equivalent La(2) atoms.