Sr2TbSbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the cubic Pn-3 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to twelve equivalent O(1) atoms to form SrO12 cuboctahedra that share faces with four equivalent Tb(1)O6 octahedra and faces with four equivalent Sb(1)O6 octahedra. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to eight equivalent O(1) atoms. Tb(1) is bonded to six equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 21°. Sb(1) is bonded to six equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 21°. O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Tb(1), and one Sb(1) atom.
Sr2TbSbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the cubic Pn-3 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to twelve equivalent O(1) atoms to form SrO12 cuboctahedra that share faces with four equivalent Tb(1)O6 octahedra and faces with four equivalent Sb(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 2.95 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to eight equivalent O(1) atoms. There are four shorter (2.57 Å) and four longer (3.02 Å) Sr(2)-O(1) bond lengths. Tb(1) is bonded to six equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 21°. All Tb(1)-O(1) bond lengths are 2.25 Å. Sb(1) is bonded to six equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 21°. All Sb(1)-O(1) bond lengths are 2.01 Å. O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Tb(1), and one Sb(1) atom.