Sm2Fe2O5 crystallizes in the orthorhombic Ima2 space group. Sm(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with two equivalent Fe(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. In the second Fe site, Fe(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Fe(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sm(1) and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded to two equivalent Sm(1) and two equivalent Fe(2) atoms to form corner-sharing OSm2Fe2 tetrahedra.
Sm2Fe2O5 crystallizes in the orthorhombic Ima2 space group. Sm(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Sm(1)-O(3) bond length is 2.30 Å. There is one shorter (2.40 Å) and one longer (2.44 Å) Sm(1)-O(1) bond length. There is one shorter (2.30 Å) and one longer (2.40 Å) Sm(1)-O(2) bond length. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with two equivalent Fe(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. Both Fe(1)-O(2) bond lengths are 2.27 Å. All Fe(1)-O(1) bond lengths are 2.06 Å. In the second Fe site, Fe(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Fe(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. Both Fe(2)-O(2) bond lengths are 1.95 Å. There is one shorter (2.14 Å) and one longer (2.19 Å) Fe(2)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sm(1) and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded to two equivalent Sm(1) and two equivalent Fe(2) atoms to form corner-sharing OSm2Fe2 tetrahedra.