Sr2TbSeO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. Sr(1) is bonded to twelve equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Tb(1)O6 octahedra, and faces with four equivalent Se(1)O6 octahedra. Tb(1) is bonded to six equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Se(1)O6 octahedra and faces with eight equivalent Sr(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 Tb(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. O(1) is bonded to four equivalent Sr(1), one Tb(1), and one Se(1) atom to form a mixture of distorted corner, edge, and face-sharing OSr4TbSe octahedra. The corner-sharing octahedral tilt angles range from 0-60°.
Sr2TbSeO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. Sr(1) is bonded to twelve equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Tb(1)O6 octahedra, and faces with four equivalent Se(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 2.93 Å. Tb(1) is bonded to six equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Se(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Tb(1)-O(1) bond lengths are 2.20 Å. Se(1) is bonded to six equivalent O(1) atoms to form SeO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Se(1)-O(1) bond lengths are 1.94 Å. O(1) is bonded to four equivalent Sr(1), one Tb(1), and one Se(1) atom to form a mixture of distorted corner, edge, and face-sharing OSr4TbSe octahedra. The corner-sharing octahedral tilt angles range from 0-60°.