Ce4Se3O4 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 4-coordinate geometry to two equivalent Se(1), two equivalent Se(2), one O(1), one O(3), and two equivalent O(2) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to four equivalent Se(1), two equivalent O(2), and two equivalent O(3) atoms. In the third Ce site, Ce(3) is bonded in a 4-coordinate geometry to two equivalent Se(2), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), and one Se(2) atom. In the second Se site, Se(2) is bonded in a 8-coordinate geometry to two equivalent Ce(3), four equivalent Ce(1), and two equivalent Se(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(1) and two equivalent Ce(3) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the second O site, O(2) is bonded to one Ce(2), one Ce(3), and two equivalent Ce(1) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra.
Ce4Se3O4 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 4-coordinate geometry to two equivalent Se(1), two equivalent Se(2), one O(1), one O(3), and two equivalent O(2) atoms. Both Ce(1)-Se(1) bond lengths are 3.08 Å. Both Ce(1)-Se(2) bond lengths are 3.23 Å. The Ce(1)-O(1) bond length is 2.42 Å. The Ce(1)-O(3) bond length is 2.42 Å. Both Ce(1)-O(2) bond lengths are 2.33 Å. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to four equivalent Se(1), two equivalent O(2), and two equivalent O(3) atoms. All Ce(2)-Se(1) bond lengths are 3.08 Å. Both Ce(2)-O(2) bond lengths are 2.40 Å. Both Ce(2)-O(3) bond lengths are 2.39 Å. In the third Ce site, Ce(3) is bonded in a 4-coordinate geometry to two equivalent Se(2), two equivalent O(1), and two equivalent O(2) atoms. Both Ce(3)-Se(2) bond lengths are 3.12 Å. Both Ce(3)-O(1) bond lengths are 2.28 Å. Both Ce(3)-O(2) bond lengths are 2.42 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), and one Se(2) atom. The Se(1)-Se(2) bond length is 2.95 Å. In the second Se site, Se(2) is bonded in a 8-coordinate geometry to two equivalent Ce(3), four equivalent Ce(1), and two equivalent Se(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(1) and two equivalent Ce(3) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the second O site, O(2) is bonded to one Ce(2), one Ce(3), and two equivalent Ce(1) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra.