Tb4PtGa12 crystallizes in the cubic Im-3m space group. Tb(1) is bonded to six equivalent Ga(1) and six equivalent Ga(2) atoms to form TbGa12 cuboctahedra that share corners with twelve equivalent Tb(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(2)Tb4Ga8 cuboctahedra, faces with six equivalent Tb(1)Ga12 cuboctahedra, faces with six equivalent Ga(2)Tb4Ga8 cuboctahedra, and faces with two equivalent Pt(1)Ga6 octahedra. Pt(1) is bonded to six equivalent Ga(1) atoms to form PtGa6 octahedra that share corners with twenty-four equivalent Ga(2)Tb4Ga8 cuboctahedra and faces with eight equivalent Tb(1)Ga12 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Pt(1), and four equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded to four equivalent Tb(1), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted GaTb4Ga8 cuboctahedra that share corners with four equivalent Ga(2)Tb4Ga8 cuboctahedra, corners with four equivalent Pt(1)Ga6 octahedra, edges with eight equivalent Tb(1)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Tb4Ga8 cuboctahedra, faces with four equivalent Tb(1)Ga12 cuboctahedra, and faces with six equivalent Ga(2)Tb4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 51°.
Tb4PtGa12 crystallizes in the cubic Im-3m space group. Tb(1) is bonded to six equivalent Ga(1) and six equivalent Ga(2) atoms to form TbGa12 cuboctahedra that share corners with twelve equivalent Tb(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(2)Tb4Ga8 cuboctahedra, faces with six equivalent Tb(1)Ga12 cuboctahedra, faces with six equivalent Ga(2)Tb4Ga8 cuboctahedra, and faces with two equivalent Pt(1)Ga6 octahedra. All Tb(1)-Ga(1) bond lengths are 3.06 Å. All Tb(1)-Ga(2) bond lengths are 3.03 Å. Pt(1) is bonded to six equivalent Ga(1) atoms to form PtGa6 octahedra that share corners with twenty-four equivalent Ga(2)Tb4Ga8 cuboctahedra and faces with eight equivalent Tb(1)Ga12 cuboctahedra. All Pt(1)-Ga(1) bond lengths are 2.55 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Pt(1), and four equivalent Ga(2) atoms. All Ga(1)-Ga(2) bond lengths are 2.75 Å. In the second Ga site, Ga(2) is bonded to four equivalent Tb(1), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted GaTb4Ga8 cuboctahedra that share corners with four equivalent Ga(2)Tb4Ga8 cuboctahedra, corners with four equivalent Pt(1)Ga6 octahedra, edges with eight equivalent Tb(1)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Tb4Ga8 cuboctahedra, faces with four equivalent Tb(1)Ga12 cuboctahedra, and faces with six equivalent Ga(2)Tb4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 51°. All Ga(2)-Ga(2) bond lengths are 3.03 Å.