Th3Ga2 crystallizes in the tetragonal P4/mbm space group. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a square co-planar geometry to four equivalent Ga(1) atoms. In the second Th site, Th(2) is bonded in a 6-coordinate geometry to six equivalent Ga(1) atoms. Ga(1) is bonded in a 9-coordinate geometry to two equivalent Th(1), six equivalent Th(2), and one Ga(1) atom.
Th3Ga2 crystallizes in the tetragonal P4/mbm space group. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a square co-planar geometry to four equivalent Ga(1) atoms. All Th(1)-Ga(1) bond lengths are 3.20 Å. In the second Th site, Th(2) is bonded in a 6-coordinate geometry to six equivalent Ga(1) atoms. There are two shorter (3.17 Å) and four longer (3.21 Å) Th(2)-Ga(1) bond lengths. Ga(1) is bonded in a 9-coordinate geometry to two equivalent Th(1), six equivalent Th(2), and one Ga(1) atom. The Ga(1)-Ga(1) bond length is 2.62 Å.