TbTa3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. Tb(1) is bonded in a distorted body-centered cubic geometry to six equivalent Ta(2) and eight equivalent Ta(1) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to four equivalent Tb(1) and four equivalent Ta(2) atoms to form a mixture of distorted face, edge, and corner-sharing TaTb4Ta4 tetrahedra. In the second Ta site, Ta(2) is bonded in a 14-coordinate geometry to six equivalent Tb(1) and eight equivalent Ta(1) atoms.
TbTa3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. Tb(1) is bonded in a distorted body-centered cubic geometry to six equivalent Ta(2) and eight equivalent Ta(1) atoms. All Tb(1)-Ta(2) bond lengths are 3.44 Å. All Tb(1)-Ta(1) bond lengths are 2.98 Å. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to four equivalent Tb(1) and four equivalent Ta(2) atoms to form a mixture of distorted face, edge, and corner-sharing TaTb4Ta4 tetrahedra. All Ta(1)-Ta(2) bond lengths are 2.98 Å. In the second Ta site, Ta(2) is bonded in a 14-coordinate geometry to six equivalent Tb(1) and eight equivalent Ta(1) atoms.