TbNi3Sn2 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. In the second Tb site, Tb(2) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Ni(2), and six equivalent Sn(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Tb(1), two equivalent Tb(2), two equivalent Ni(2), and four equivalent Sn(1) atoms. In the second Ni site, Ni(2) is bonded to four equivalent Tb(2), four equivalent Ni(1), and four equivalent Sn(1) atoms to form a mixture of corner and face-sharing NiTb4Ni4Sn4 cuboctahedra. Sn(1) is bonded in a 8-coordinate geometry to two equivalent Tb(2), two equivalent Ni(2), and four equivalent Ni(1) atoms.
TbNi3Sn2 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. All Tb(1)-Ni(1) bond lengths are 3.02 Å. In the second Tb site, Tb(2) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Ni(2), and six equivalent Sn(1) atoms. All Tb(2)-Ni(1) bond lengths are 3.20 Å. All Tb(2)-Ni(2) bond lengths are 3.42 Å. All Tb(2)-Sn(1) bond lengths are 3.23 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Tb(1), two equivalent Tb(2), two equivalent Ni(2), and four equivalent Sn(1) atoms. Both Ni(1)-Ni(2) bond lengths are 2.62 Å. All Ni(1)-Sn(1) bond lengths are 2.58 Å. In the second Ni site, Ni(2) is bonded to four equivalent Tb(2), four equivalent Ni(1), and four equivalent Sn(1) atoms to form a mixture of corner and face-sharing NiTb4Ni4Sn4 cuboctahedra. All Ni(2)-Sn(1) bond lengths are 2.66 Å. Sn(1) is bonded in a 8-coordinate geometry to two equivalent Tb(2), two equivalent Ni(2), and four equivalent Ni(1) atoms.