TbCd2F8 crystallizes in the tetragonal I-4 space group. Tb(1) is bonded in a 8-coordinate geometry to four equivalent F(1) and four equivalent F(2) atoms. Cd(1) is bonded to two equivalent F(1) and four equivalent F(2) atoms to form corner-sharing CdF6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent F sites. In the first F site, F(2) is bonded in a trigonal planar geometry to one Tb(1) and two equivalent Cd(1) atoms. In the second F site, F(1) is bonded in a bent 150 degrees geometry to one Tb(1) and one Cd(1) atom.
TbCd2F8 crystallizes in the tetragonal I-4 space group. Tb(1) is bonded in a 8-coordinate geometry to four equivalent F(1) and four equivalent F(2) atoms. All Tb(1)-F(1) bond lengths are 2.21 Å. All Tb(1)-F(2) bond lengths are 2.40 Å. Cd(1) is bonded to two equivalent F(1) and four equivalent F(2) atoms to form corner-sharing CdF6 octahedra. The corner-sharing octahedral tilt angles are 53°. Both Cd(1)-F(1) bond lengths are 2.16 Å. There are two shorter (2.23 Å) and two longer (2.39 Å) Cd(1)-F(2) bond lengths. There are two inequivalent F sites. In the first F site, F(2) is bonded in a trigonal planar geometry to one Tb(1) and two equivalent Cd(1) atoms. In the second F site, F(1) is bonded in a bent 150 degrees geometry to one Tb(1) and one Cd(1) atom.