Ce3Se4 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of distorted corner, face, and edge-sharing CeSe8 hexagonal bipyramids. In the second Ce site, Ce(2) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of distorted corner, face, and edge-sharing CeSe8 hexagonal bipyramids. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Ce(2) and four equivalent Ce(1) atoms to form a mixture of distorted corner, face, and edge-sharing SeCe6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the second Se site, Se(2) is bonded to two equivalent Ce(2) and four equivalent Ce(1) atoms to form a mixture of distorted corner, face, and edge-sharing SeCe6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°.
Ce3Se4 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of distorted corner, face, and edge-sharing CeSe8 hexagonal bipyramids. There are a spread of Ce(1)-Se(1) bond distances ranging from 3.04-3.23 Å. There are a spread of Ce(1)-Se(2) bond distances ranging from 3.03-3.24 Å. In the second Ce site, Ce(2) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of distorted corner, face, and edge-sharing CeSe8 hexagonal bipyramids. There are two shorter (3.04 Å) and two longer (3.23 Å) Ce(2)-Se(1) bond lengths. There are two shorter (3.03 Å) and two longer (3.22 Å) Ce(2)-Se(2) bond lengths. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Ce(2) and four equivalent Ce(1) atoms to form a mixture of distorted corner, face, and edge-sharing SeCe6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the second Se site, Se(2) is bonded to two equivalent Ce(2) and four equivalent Ce(1) atoms to form a mixture of distorted corner, face, and edge-sharing SeCe6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°.