Fe5SnO8 is Spinel-like structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2) and three equivalent O(1) atoms to form FeO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra and corners with nine equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the second Fe site, Fe(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. Sn(1) is bonded to six equivalent O(1) atoms to form SnO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra and edges with six equivalent Fe(2)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Fe(1), two equivalent Fe(2), and one Sn(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1) and three equivalent Fe(2) atoms.
Fe5SnO8 is Spinel-like structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2) and three equivalent O(1) atoms to form FeO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra and corners with nine equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. The Fe(1)-O(2) bond length is 1.91 Å. All Fe(1)-O(1) bond lengths are 1.95 Å. In the second Fe site, Fe(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. Both Fe(2)-O(2) bond lengths are 2.15 Å. All Fe(2)-O(1) bond lengths are 2.17 Å. Sn(1) is bonded to six equivalent O(1) atoms to form SnO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra and edges with six equivalent Fe(2)O6 octahedra. All Sn(1)-O(1) bond lengths are 2.11 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Fe(1), two equivalent Fe(2), and one Sn(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1) and three equivalent Fe(2) atoms.