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TbGa crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Tb is bonded in a 7-coordinate geometry to seven equivalent Ga atoms. There are a spread of Tb–Ga bond distances ranging from 3.07–3.21 Å. Ga is bonded in a 9-coordinate geometry to seven equivalent Tb and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.63 Å.
TbGa3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tb is bonded to twelve equivalent Ga atoms to form a mixture of corner and face-sharing TbGa12 cuboctahedra. All Tb–Ga bond lengths are 3.03 Å. Ga is bonded in a distorted square co-planar geometry to four equivalent Tb atoms.
TbGa2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Tb is bonded to twelve equivalent Ga atoms to form a mixture of edge and face-sharing TbGa12 cuboctahedra. All Tb–Ga bond lengths are 3.20 Å. Ga is bonded in a 9-coordinate geometry to six equivalent Tb and three equivalent Ga atoms. All Ga–Ga bond lengths are 2.44 Å.
TbGa3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Tb is bonded to twelve equivalent Ga atoms to form a mixture of distorted corner and face-sharing TbGa12 cuboctahedra. There are six shorter (3.05 Å) and six longer (3.16 Å) Tb–Ga bond lengths. Ga is bonded in a 10-coordinate geometry to four equivalent Tb and six equivalent Ga atoms. All Ga–Ga bond lengths are 2.80 Å.
Tb5Ga3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Tb sites. In the first Tb site, Tb is bonded to six Ga atoms to form distorted TbGa6 octahedra that share corners with six equivalent TbGa6 octahedra, corners with sixteen equivalent TbGa5 trigonal bipyramids, and faces with eight equivalent TbGa5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 0–54°. There are four shorter (3.06 Å) and two longer (3.54 Å) Tb–Ga bond lengths. In the second Tb site, Tb is bonded to five Ga atoms to form distorted TbGa5 trigonal bipyramids that share corners with four equivalent TbGa6 octahedra, corners with twelve equivalent TbGa5 trigonal bipyramids, edges with seven equivalent TbGa5 trigonal bipyramids, faces with two equivalent TbGa6 octahedra, and a faceface with one TbGa5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 43–63°. There are a spread of Tb–Ga bond distances ranging from 3.08–3.21 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to ten Tb atoms. In the second Ga site, Ga is bonded in a 9-coordinate geometry to eight Tb and one Ga atom. The Ga–Ga bond length is 2.65 Å.
TbGa6 crystallizes in the tetragonal P4/nbm space group. The structure is three-dimensional. Tb is bonded to twelve Ga atoms to form a mixture of distorted edge and face-sharing TbGa12 cuboctahedra. There are four shorter (3.11 Å) and eight longer (3.25 Å) Tb–Ga bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to four equivalent Tb and five Ga atoms. There are one shorter (2.43 Å) and four longer (2.60 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 4-coordinate geometry to one Tb and three Ga atoms. The Ga–Ga bond length is 2.50 Å.
Tb3Ga5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Tb sites. In the first Tb site, Tb is bonded in a 5-coordinate geometry to nine Ga atoms. There are a spread of Tb–Ga bond distances ranging from 2.87–3.30 Å. In the second Tb site, Tb is bonded in a 10-coordinate geometry to ten Ga atoms. There are a spread of Tb–Ga bond distances ranging from 3.00–3.33 Å. There are four inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to six Tb and four Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.67–2.90 Å. In the second Ga site, Ga is bonded in a 1-coordinate geometry to five Tb and five Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.67–3.08 Å. In the third Ga site, Ga is bonded in a 10-coordinate geometry to six Tb and four Ga atoms. In the fourth Ga site, Ga is bonded in a 9-coordinate geometry to six Tb and three Ga atoms.