K2TbO3 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted KO6 octahedra that share corners with two equivalent K(3)O6 octahedra, edges with two equivalent K(3)O6 octahedra, edges with three equivalent Tb(1)O6 octahedra, and edges with three equivalent Tb(2)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. In the third K site, K(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted KO6 octahedra that share corners with two equivalent K(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, corners with two equivalent Tb(2)O6 octahedra, edges with two equivalent K(2)O6 octahedra, edges with two equivalent Tb(1)O6 octahedra, and edges with two equivalent Tb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-21°. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TbO6 octahedra that share corners with two equivalent K(3)O6 octahedra, edges with two equivalent K(3)O6 octahedra, edges with three equivalent K(2)O6 octahedra, and edges with three equivalent Tb(2)O6 octahedra. The corner-sharing octahedral tilt angles are 21°. In the second Tb site, Tb(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TbO6 octahedra that share corners with two equivalent K(3)O6 octahedra, edges with two equivalent K(3)O6 octahedra, edges with three equivalent K(2)O6 octahedra, and edges with three equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one K(2), one K(3), two equivalent K(1), one Tb(1), and one Tb(2) atom to form a mixture of distorted edge and corner-sharing OK4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second O site, O(2) is bonded to one K(2), one K(3), two equivalent K(1), one Tb(1), and one Tb(2) atom to form a mixture of distorted edge and corner-sharing OK4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), one K(3), two equivalent K(1), one Tb(1), and one Tb(2) atom.
K2TbO3 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There is one shorter (2.80 Å) and one longer (2.83 Å) K(1)-O(1) bond length. There is one shorter (2.64 Å) and one longer (2.91 Å) K(1)-O(2) bond length. There is one shorter (2.61 Å) and one longer (3.26 Å) K(1)-O(3) bond length. In the second K site, K(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted KO6 octahedra that share corners with two equivalent K(3)O6 octahedra, edges with two equivalent K(3)O6 octahedra, edges with three equivalent Tb(1)O6 octahedra, and edges with three equivalent Tb(2)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. Both K(2)-O(1) bond lengths are 2.77 Å. Both K(2)-O(2) bond lengths are 2.78 Å. Both K(2)-O(3) bond lengths are 2.67 Å. In the third K site, K(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted KO6 octahedra that share corners with two equivalent K(2)O6 octahedra, corners with two equivalent Tb(1)O6 octahedra, corners with two equivalent Tb(2)O6 octahedra, edges with two equivalent K(2)O6 octahedra, edges with two equivalent Tb(1)O6 octahedra, and edges with two equivalent Tb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-21°. Both K(3)-O(1) bond lengths are 2.59 Å. Both K(3)-O(2) bond lengths are 2.86 Å. Both K(3)-O(3) bond lengths are 3.04 Å. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TbO6 octahedra that share corners with two equivalent K(3)O6 octahedra, edges with two equivalent K(3)O6 octahedra, edges with three equivalent K(2)O6 octahedra, and edges with three equivalent Tb(2)O6 octahedra. The corner-sharing octahedral tilt angles are 21°. Both Tb(1)-O(1) bond lengths are 2.28 Å. Both Tb(1)-O(2) bond lengths are 2.28 Å. Both Tb(1)-O(3) bond lengths are 2.32 Å. In the second Tb site, Tb(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TbO6 octahedra that share corners with two equivalent K(3)O6 octahedra, edges with two equivalent K(3)O6 octahedra, edges with three equivalent K(2)O6 octahedra, and edges with three equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Tb(2)-O(1) bond lengths are 2.27 Å. Both Tb(2)-O(2) bond lengths are 2.29 Å. Both Tb(2)-O(3) bond lengths are 2.32 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one K(2), one K(3), two equivalent K(1), one Tb(1), and one Tb(2) atom to form a mixture of distorted edge and corner-sharing OK4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second O site, O(2) is bonded to one K(2), one K(3), two equivalent K(1), one Tb(1), and one Tb(2) atom to form a mixture of distorted edge and corner-sharing OK4Tb2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), one K(3), two equivalent K(1), one Tb(1), and one Tb(2) atom.