BaSn2Fe4O11 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded to two equivalent O(1), two equivalent O(4), four equivalent O(2), and four equivalent O(5) atoms to form distorted BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Fe(1)O6 octahedra, edges with four equivalent Sn(1)O6 octahedra, edges with three equivalent Fe(2)O5 trigonal bipyramids, and faces with six equivalent Fe(3)O6 octahedra. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(2)O5 trigonal bipyramids, edges with two equivalent Ba(1)O12 cuboctahedra, and edges with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the second Fe site, Fe(2) is bonded to one O(1), two equivalent O(3), and two equivalent O(5) atoms to form FeO5 trigonal bipyramids that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Sn(1)O6 octahedra, corners with six equivalent Fe(3)O6 octahedra, and edges with three equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-57°. In the third Fe site, Fe(3) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Sn(1)O6 octahedra, corners with three equivalent Fe(2)O5 trigonal bipyramids, faces with three equivalent Ba(1)O12 cuboctahedra, and  a faceface with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-55°. Sn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(2)O5 trigonal bipyramids, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-55°. There are five inequivalent O sites. In the first O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(2), and two equivalent Sn(1) atoms. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Fe(3), and two equivalent Sn(1) atoms. In the third O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(2), and two equivalent Fe(3) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(2), and two equivalent Fe(3) atoms. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Fe(1), one Fe(3), and one Sn(1) atom.
BaSn2Fe4O11 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded to two equivalent O(1), two equivalent O(4), four equivalent O(2), and four equivalent O(5) atoms to form distorted BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Fe(1)O6 octahedra, edges with four equivalent Sn(1)O6 octahedra, edges with three equivalent Fe(2)O5 trigonal bipyramids, and faces with six equivalent Fe(3)O6 octahedra. Both Ba(1)-O(1) bond lengths are 3.07 Å. Both Ba(1)-O(4) bond lengths are 2.86 Å. All Ba(1)-O(2) bond lengths are 2.87 Å. There are two shorter (3.03 Å) and two longer (3.04 Å) Ba(1)-O(5) bond lengths. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(2)O5 trigonal bipyramids, edges with two equivalent Ba(1)O12 cuboctahedra, and edges with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. Both Fe(1)-O(3) bond lengths are 2.08 Å. All Fe(1)-O(2) bond lengths are 2.04 Å. In the second Fe site, Fe(2) is bonded to one O(1), two equivalent O(3), and two equivalent O(5) atoms to form FeO5 trigonal bipyramids that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Sn(1)O6 octahedra, corners with six equivalent Fe(3)O6 octahedra, and edges with three equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-57°. The Fe(2)-O(1) bond length is 1.93 Å. Both Fe(2)-O(3) bond lengths are 2.28 Å. Both Fe(2)-O(5) bond lengths are 1.92 Å. In the third Fe site, Fe(3) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Sn(1)O6 octahedra, corners with three equivalent Fe(2)O5 trigonal bipyramids, faces with three equivalent Ba(1)O12 cuboctahedra, and  a faceface with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-55°. The Fe(3)-O(1) bond length is 2.10 Å. The Fe(3)-O(4) bond length is 2.04 Å. Both Fe(3)-O(2) bond lengths are 2.04 Å. Both Fe(3)-O(5) bond lengths are 2.12 Å. Sn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with four equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(2)O5 trigonal bipyramids, edges with two equivalent Ba(1)O12 cuboctahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-55°. Both Sn(1)-O(2) bond lengths are 2.07 Å. Both Sn(1)-O(3) bond lengths are 2.12 Å. Both Sn(1)-O(4) bond lengths are 2.08 Å. There are five inequivalent O sites. In the first O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(2), and two equivalent Sn(1) atoms. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Fe(3), and two equivalent Sn(1) atoms. In the third O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(2), and two equivalent Fe(3) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Fe(2), and two equivalent Fe(3) atoms. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Fe(1), one Fe(3), and one Sn(1) atom.