U4CeC5 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one C(1), one C(3), and four equivalent C(2) atoms to form UC6 octahedra that share  a cornercorner with one U(2)C6 octahedra, corners with five equivalent U(1)C6 octahedra, edges with four equivalent U(1)C6 octahedra, edges with four equivalent U(2)C6 octahedra, and edges with four equivalent Ce(1)C6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the second U site, U(2) is bonded to one C(2) and five equivalent C(1) atoms to form UC6 octahedra that share  a cornercorner with one U(1)C6 octahedra,  a cornercorner with one Ce(1)C6 octahedra, corners with four equivalent U(2)C6 octahedra, edges with four equivalent U(1)C6 octahedra, and edges with eight equivalent U(2)C6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. Ce(1) is bonded to two equivalent C(2) and four equivalent C(3) atoms to form CeC6 octahedra that share corners with two equivalent U(2)C6 octahedra, corners with four equivalent Ce(1)C6 octahedra, edges with four equivalent Ce(1)C6 octahedra, and edges with eight equivalent U(1)C6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent C sites. In the first C site, C(1) is bonded to one U(1) and five equivalent U(2) atoms to form CU6 octahedra that share  a cornercorner with one C(3)Ce4U2 octahedra,  a cornercorner with one C(2)CeU5 octahedra, corners with four equivalent C(1)U6 octahedra, edges with four equivalent C(2)CeU5 octahedra, and edges with eight equivalent C(1)U6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second C site, C(2) is bonded to one U(2), four equivalent U(1), and one Ce(1) atom to form CCeU5 octahedra that share  a cornercorner with one C(1)U6 octahedra, corners with five equivalent C(2)CeU5 octahedra, edges with four equivalent C(3)Ce4U2 octahedra, edges with four equivalent C(2)CeU5 octahedra, and edges with four equivalent C(1)U6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third C site, C(3) is bonded to two equivalent U(1) and four equivalent Ce(1) atoms to form CCe4U2 octahedra that share corners with two equivalent C(1)U6 octahedra, corners with four equivalent C(3)Ce4U2 octahedra, edges with four equivalent C(3)Ce4U2 octahedra, and edges with eight equivalent C(2)CeU5 octahedra. The corner-sharing octahedra are not tilted.
U4CeC5 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one C(1), one C(3), and four equivalent C(2) atoms to form UC6 octahedra that share  a cornercorner with one U(2)C6 octahedra, corners with five equivalent U(1)C6 octahedra, edges with four equivalent U(1)C6 octahedra, edges with four equivalent U(2)C6 octahedra, and edges with four equivalent Ce(1)C6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. The U(1)-C(1) bond length is 2.49 Å. The U(1)-C(3) bond length is 2.47 Å. All U(1)-C(2) bond lengths are 2.50 Å. In the second U site, U(2) is bonded to one C(2) and five equivalent C(1) atoms to form UC6 octahedra that share  a cornercorner with one U(1)C6 octahedra,  a cornercorner with one Ce(1)C6 octahedra, corners with four equivalent U(2)C6 octahedra, edges with four equivalent U(1)C6 octahedra, and edges with eight equivalent U(2)C6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. The U(2)-C(2) bond length is 2.37 Å. There is one shorter (2.46 Å) and four longer (2.50 Å) U(2)-C(1) bond lengths. Ce(1) is bonded to two equivalent C(2) and four equivalent C(3) atoms to form CeC6 octahedra that share corners with two equivalent U(2)C6 octahedra, corners with four equivalent Ce(1)C6 octahedra, edges with four equivalent Ce(1)C6 octahedra, and edges with eight equivalent U(1)C6 octahedra. The corner-sharing octahedra are not tilted. Both Ce(1)-C(2) bond lengths are 2.61 Å. All Ce(1)-C(3) bond lengths are 2.50 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded to one U(1) and five equivalent U(2) atoms to form CU6 octahedra that share  a cornercorner with one C(3)Ce4U2 octahedra,  a cornercorner with one C(2)CeU5 octahedra, corners with four equivalent C(1)U6 octahedra, edges with four equivalent C(2)CeU5 octahedra, and edges with eight equivalent C(1)U6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second C site, C(2) is bonded to one U(2), four equivalent U(1), and one Ce(1) atom to form CCeU5 octahedra that share  a cornercorner with one C(1)U6 octahedra, corners with five equivalent C(2)CeU5 octahedra, edges with four equivalent C(3)Ce4U2 octahedra, edges with four equivalent C(2)CeU5 octahedra, and edges with four equivalent C(1)U6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third C site, C(3) is bonded to two equivalent U(1) and four equivalent Ce(1) atoms to form CCe4U2 octahedra that share corners with two equivalent C(1)U6 octahedra, corners with four equivalent C(3)Ce4U2 octahedra, edges with four equivalent C(3)Ce4U2 octahedra, and edges with eight equivalent C(2)CeU5 octahedra. The corner-sharing octahedra are not tilted.