CeSe2 crystallizes in the orthorhombic I2_12_12_1 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to two equivalent Se(1) and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a bent 120 degrees geometry to one Ce(1) and one Ce(2) atom. In the second Se site, Se(2) is bonded in a bent 120 degrees geometry to two equivalent Ce(1) atoms. In the third Se site, Se(3) is bonded in a bent 120 degrees geometry to two equivalent Ce(2) atoms.
CeSe2 crystallizes in the orthorhombic I2_12_12_1 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form corner-sharing CeSe4 tetrahedra. Both Ce(1)-Se(1) bond lengths are 2.74 Å. Both Ce(1)-Se(2) bond lengths are 2.74 Å. In the second Ce site, Ce(2) is bonded to two equivalent Se(1) and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. Both Ce(2)-Se(1) bond lengths are 2.73 Å. Both Ce(2)-Se(3) bond lengths are 2.74 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a bent 120 degrees geometry to one Ce(1) and one Ce(2) atom. In the second Se site, Se(2) is bonded in a bent 120 degrees geometry to two equivalent Ce(1) atoms. In the third Se site, Se(3) is bonded in a bent 120 degrees geometry to two equivalent Ce(2) atoms.