Tb10(SiSb)3 crystallizes in the hexagonal P-62m space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 5-coordinate geometry to two equivalent Si(1) and three equivalent Sb(1) atoms. In the second Tb site, Tb(2) is bonded in a 5-coordinate geometry to three equivalent Si(1) and two equivalent Sb(1) atoms. In the third Tb site, Tb(3) is bonded in a 6-coordinate geometry to three equivalent Si(1) and three equivalent Sb(1) atoms. Si(1) is bonded in a 9-coordinate geometry to two equivalent Tb(1), three equivalent Tb(2), and four equivalent Tb(3) atoms. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), three equivalent Tb(1), and four equivalent Tb(3) atoms.
Tb10(SiSb)3 crystallizes in the hexagonal P-62m space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 5-coordinate geometry to two equivalent Si(1) and three equivalent Sb(1) atoms. Both Tb(1)-Si(1) bond lengths are 3.45 Å. There are two shorter (3.02 Å) and one longer (3.18 Å) Tb(1)-Sb(1) bond length. In the second Tb site, Tb(2) is bonded in a 5-coordinate geometry to three equivalent Si(1) and two equivalent Sb(1) atoms. There are two shorter (3.00 Å) and one longer (3.20 Å) Tb(2)-Si(1) bond length. Both Tb(2)-Sb(1) bond lengths are 3.46 Å. In the third Tb site, Tb(3) is bonded in a 6-coordinate geometry to three equivalent Si(1) and three equivalent Sb(1) atoms. All Tb(3)-Si(1) bond lengths are 3.11 Å. All Tb(3)-Sb(1) bond lengths are 3.16 Å. Si(1) is bonded in a 9-coordinate geometry to two equivalent Tb(1), three equivalent Tb(2), and four equivalent Tb(3) atoms. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), three equivalent Tb(1), and four equivalent Tb(3) atoms.