SrFe3Bi2O9 crystallizes in the trigonal P-3m1 space group. Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Fe(2)O6 octahedra, and faces with six equivalent Fe(1)O6 octahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with three equivalent Fe(1)O6 octahedra, corners with three equivalent Fe(2)O6 octahedra, and faces with three equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the second Fe site, Fe(2) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 9°. Bi(1) is bonded in a 9-coordinate geometry to nine equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(1), one Fe(1), one Fe(2), and three equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Fe(1) atoms.
SrFe3Bi2O9 crystallizes in the trigonal P-3m1 space group. Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Fe(2)O6 octahedra, and faces with six equivalent Fe(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 2.91 Å. All Sr(1)-O(2) bond lengths are 2.79 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with three equivalent Fe(1)O6 octahedra, corners with three equivalent Fe(2)O6 octahedra, and faces with three equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-9°. All Fe(1)-O(1) bond lengths are 2.06 Å. All Fe(1)-O(2) bond lengths are 1.90 Å. In the second Fe site, Fe(2) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra and faces with two equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 9°. All Fe(2)-O(1) bond lengths are 1.99 Å. Bi(1) is bonded in a 9-coordinate geometry to nine equivalent O(1) atoms. There are three shorter (2.39 Å) and six longer (2.81 Å) Bi(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(1), one Fe(1), one Fe(2), and three equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Fe(1) atoms.