K2TaNbO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. K(1) is bonded to twelve equivalent O(1) atoms to form KO12 cuboctahedra that share corners with twelve equivalent K(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. Ta(1) is bonded to six equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Nb(1) is bonded to six equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. O(1) is bonded in a distorted linear geometry to four equivalent K(1), one Ta(1), and one Nb(1) atom.
K2TaNbO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. K(1) is bonded to twelve equivalent O(1) atoms to form KO12 cuboctahedra that share corners with twelve equivalent K(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. All K(1)-O(1) bond lengths are 2.86 Å. Ta(1) is bonded to six equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Ta(1)-O(1) bond lengths are 2.01 Å. Nb(1) is bonded to six equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Nb(1)-O(1) bond lengths are 2.03 Å. O(1) is bonded in a distorted linear geometry to four equivalent K(1), one Ta(1), and one Nb(1) atom.