KCaSmSeO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic F-43m 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 Ca(1)O12 cuboctahedra, faces with four equivalent Sm(1)O6 octahedra, and faces with four equivalent Se(1)O6 octahedra. Ca(1) is bonded to twelve equivalent O(1) atoms to form CaO12 cuboctahedra that share corners with twelve equivalent Ca(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, faces with four equivalent Sm(1)O6 octahedra, and faces with four equivalent Se(1)O6 octahedra. Sm(1) is bonded to six equivalent O(1) atoms to form SmO6 octahedra that share corners with six equivalent Se(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Se(1) is bonded to six equivalent O(1) atoms to form SeO6 octahedra that share corners with six equivalent Sm(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. O(1) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent Ca(1), one Sm(1), and one Se(1) atom.
KCaSmSeO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic F-43m 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 Ca(1)O12 cuboctahedra, faces with four equivalent Sm(1)O6 octahedra, and faces with four equivalent Se(1)O6 octahedra. All K(1)-O(1) bond lengths are 2.90 Å. Ca(1) is bonded to twelve equivalent O(1) atoms to form CaO12 cuboctahedra that share corners with twelve equivalent Ca(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, faces with four equivalent Sm(1)O6 octahedra, and faces with four equivalent Se(1)O6 octahedra. All Ca(1)-O(1) bond lengths are 2.90 Å. Sm(1) is bonded to six equivalent O(1) atoms to form SmO6 octahedra that share corners with six equivalent Se(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Sm(1)-O(1) bond lengths are 2.26 Å. Se(1) is bonded to six equivalent O(1) atoms to form SeO6 octahedra that share corners with six equivalent Sm(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Se(1)-O(1) bond lengths are 1.82 Å. O(1) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent Ca(1), one Sm(1), and one Se(1) atom.