Sr2GdBiO6 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 Gd(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to eight equivalent O(1) atoms. Gd(1) is bonded to six equivalent O(1) atoms to form GdO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. Bi(1) is bonded to six equivalent O(1) atoms to form BiO6 octahedra that share corners with six equivalent Gd(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Gd(1), and one Bi(1) atom.
Sr2GdBiO6 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 Gd(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 3.02 Å. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to eight equivalent O(1) atoms. There are four shorter (2.54 Å) and four longer (3.13 Å) Sr(2)-O(1) bond lengths. Gd(1) is bonded to six equivalent O(1) atoms to form GdO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. All Gd(1)-O(1) bond lengths are 2.27 Å. Bi(1) is bonded to six equivalent O(1) atoms to form BiO6 octahedra that share corners with six equivalent Gd(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. All Bi(1)-O(1) bond lengths are 2.14 Å. O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Gd(1), and one Bi(1) atom.