KTb3F12 crystallizes in the tetragonal I4/m space group. K(1) is bonded in a distorted cuboctahedral geometry to four equivalent F(2) and eight equivalent F(1) atoms. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to four equivalent F(1) and four equivalent F(2) atoms. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to eight equivalent F(1) atoms. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted bent 150 degrees geometry to one K(1), one Tb(1), and one Tb(2) atom. In the second F site, F(2) is bonded in a trigonal planar geometry to one K(1) and two equivalent Tb(1) atoms.
KTb3F12 crystallizes in the tetragonal I4/m space group. K(1) is bonded in a distorted cuboctahedral geometry to four equivalent F(2) and eight equivalent F(1) atoms. All K(1)-F(2) bond lengths are 2.74 Å. All K(1)-F(1) bond lengths are 3.15 Å. There are two inequivalent Tb sites. In the first Tb site, 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 2.26 Å. All Tb(1)-F(2) bond lengths are 2.34 Å. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to eight equivalent F(1) atoms. All Tb(2)-F(1) bond lengths are 2.29 Å. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted bent 150 degrees geometry to one K(1), one Tb(1), and one Tb(2) atom. In the second F site, F(2) is bonded in a trigonal planar geometry to one K(1) and two equivalent Tb(1) atoms.