Ce2Fe2Se2O3 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded in a 4-coordinate geometry to four equivalent Se(1) and four equivalent O(1) atoms. Fe(1) is bonded in a distorted linear geometry to four equivalent Se(1) and two equivalent O(2) atoms. Se(1) is bonded in a 8-coordinate geometry to four equivalent Ce(1) and four equivalent Fe(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ce(1) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the second O site, O(2) is bonded in a square co-planar geometry to four equivalent Fe(1) atoms.
Ce2Fe2Se2O3 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded in a 4-coordinate geometry to four equivalent Se(1) and four equivalent O(1) atoms. All Ce(1)-Se(1) bond lengths are 3.29 Å. All Ce(1)-O(1) bond lengths are 2.36 Å. Fe(1) is bonded in a distorted linear geometry to four equivalent Se(1) and two equivalent O(2) atoms. All Fe(1)-Se(1) bond lengths are 2.77 Å. Both Fe(1)-O(2) bond lengths are 2.03 Å. Se(1) is bonded in a 8-coordinate geometry to four equivalent Ce(1) and four equivalent Fe(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ce(1) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the second O site, O(2) is bonded in a square co-planar geometry to four equivalent Fe(1) atoms.