Tb5Ir3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to six equivalent Ir(1) atoms to form a mixture of distorted edge, face, and corner-sharing TbIr6 octahedra. The corner-sharing octahedral tilt angles are 36°. In the second Tb site, Tb(2) is bonded in a 5-coordinate geometry to five equivalent Ir(1) atoms. Ir(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1) and five equivalent Tb(2) atoms.
Tb5Ir3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to six equivalent Ir(1) atoms to form a mixture of distorted edge, face, and corner-sharing TbIr6 octahedra. The corner-sharing octahedral tilt angles are 36°. All Tb(1)-Ir(1) bond lengths are 3.01 Å. In the second Tb site, Tb(2) is bonded in a 5-coordinate geometry to five equivalent Ir(1) atoms. There are a spread of Tb(2)-Ir(1) bond distances ranging from 2.85-3.31 Å. Ir(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1) and five equivalent Tb(2) atoms.