CeSe2 is Low Tridymite-like structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(2), one Se(4), and one Se(7) atom to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(2), one Se(5), one Se(6), and one Se(8) atom to form corner-sharing CeSe4 tetrahedra. In the third Ce site, Ce(3) is bonded to one Se(3), one Se(4), one Se(5), and one Se(6) atom to form corner-sharing CeSe4 tetrahedra. There are eight inequivalent Se sites. In the first Se site, Se(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(3) atom. In the second Se site, Se(5) is bonded in a bent 150 degrees geometry to one Ce(2) and one Ce(3) atom. In the third Se site, Se(6) is bonded in a bent 150 degrees geometry to one Ce(2) and one Ce(3) atom. In the fourth Se site, Se(7) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the fifth Se site, Se(8) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the sixth Se site, Se(1) is bonded in a bent 150 degrees geometry to two equivalent Ce(1) atoms. In the seventh Se site, Se(2) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the eighth Se site, Se(3) is bonded in a bent 150 degrees geometry to two equivalent Ce(3) atoms.
CeSe2 is Low Tridymite-like structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(2), one Se(4), and one Se(7) atom to form corner-sharing CeSe4 tetrahedra. The Ce(1)-Se(1) bond length is 2.72 Å. The Ce(1)-Se(2) bond length is 2.71 Å. The Ce(1)-Se(4) bond length is 2.72 Å. The Ce(1)-Se(7) bond length is 2.72 Å. In the second Ce site, Ce(2) is bonded to one Se(2), one Se(5), one Se(6), and one Se(8) atom to form corner-sharing CeSe4 tetrahedra. The Ce(2)-Se(2) bond length is 2.72 Å. The Ce(2)-Se(5) bond length is 2.73 Å. The Ce(2)-Se(6) bond length is 2.73 Å. The Ce(2)-Se(8) bond length is 2.72 Å. In the third Ce site, Ce(3) is bonded to one Se(3), one Se(4), one Se(5), and one Se(6) atom to form corner-sharing CeSe4 tetrahedra. The Ce(3)-Se(3) bond length is 2.71 Å. The Ce(3)-Se(4) bond length is 2.72 Å. The Ce(3)-Se(5) bond length is 2.73 Å. The Ce(3)-Se(6) bond length is 2.72 Å. There are eight inequivalent Se sites. In the first Se site, Se(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(3) atom. In the second Se site, Se(5) is bonded in a bent 150 degrees geometry to one Ce(2) and one Ce(3) atom. In the third Se site, Se(6) is bonded in a bent 150 degrees geometry to one Ce(2) and one Ce(3) atom. In the fourth Se site, Se(7) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the fifth Se site, Se(8) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the sixth Se site, Se(1) is bonded in a bent 150 degrees geometry to two equivalent Ce(1) atoms. In the seventh Se site, Se(2) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the eighth Se site, Se(3) is bonded in a bent 150 degrees geometry to two equivalent Ce(3) atoms.