Tb5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. In the second Tb site, Tb(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Tb(2) and five equivalent Tb(1) atoms.
Tb5Si3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. There are a spread of Tb(1)-Si(1) bond distances ranging from 2.92-3.45 Å. In the second Tb site, Tb(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. All Tb(2)-Si(1) bond lengths are 3.06 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Tb(2) and five equivalent Tb(1) atoms.