CeSe2 is Low Tridymite-like structured and crystallizes in the orthorhombic Fmmm space group. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(4) atom to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(5), one Se(6), and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. In the third Ce site, Ce(3) is bonded to one Se(5), one Se(7), and two equivalent Se(2) atoms to form corner-sharing CeSe4 tetrahedra. In the fourth Ce site, Ce(4) is bonded to four equivalent Se(1) atoms to form corner-sharing CeSe4 tetrahedra. There are seven inequivalent Se sites. In the first Se site, Se(4) is bonded in a bent 150 degrees geometry to two equivalent Ce(1) atoms. 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(1) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(4) atom. In the fourth Se site, Se(6) is bonded in a linear geometry to two equivalent Ce(2) atoms. In the fifth Se site, Se(7) is bonded in a bent 150 degrees geometry to two equivalent Ce(3) atoms. In the sixth Se site, Se(2) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(3) atom. In the seventh Se site, Se(3) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom.
CeSe2 is Low Tridymite-like structured and crystallizes in the orthorhombic Fmmm space group. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(4) 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 2.74 Å. The Ce(1)-Se(3) bond length is 2.72 Å. The Ce(1)-Se(4) bond length is 2.71 Å. In the second Ce site, Ce(2) is bonded to one Se(5), one Se(6), and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. The Ce(2)-Se(5) bond length is 2.73 Å. The Ce(2)-Se(6) bond length is 2.72 Å. Both Ce(2)-Se(3) bond lengths are 2.71 Å. In the third Ce site, Ce(3) is bonded to one Se(5), one Se(7), and two equivalent Se(2) atoms to form corner-sharing CeSe4 tetrahedra. The Ce(3)-Se(5) bond length is 2.74 Å. The Ce(3)-Se(7) bond length is 2.70 Å. Both Ce(3)-Se(2) bond lengths are 2.71 Å. In the fourth Ce site, Ce(4) is bonded to four equivalent Se(1) atoms to form corner-sharing CeSe4 tetrahedra. All Ce(4)-Se(1) bond lengths are 2.72 Å. There are seven inequivalent Se sites. In the first Se site, Se(4) is bonded in a bent 150 degrees geometry to two equivalent Ce(1) atoms. 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(1) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(4) atom. In the fourth Se site, Se(6) is bonded in a linear geometry to two equivalent Ce(2) atoms. In the fifth Se site, Se(7) is bonded in a bent 150 degrees geometry to two equivalent Ce(3) atoms. In the sixth Se site, Se(2) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(3) atom. In the seventh Se site, Se(3) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom.