The material described by UCeC4 crystallizes in the orthorhombic Pmna space group. U(1) is bonded to two equivalent C(1) and six equivalent C(2) atoms to form UC8 hexagonal bipyramids that share edges with four equivalent Ce(1)C12 cuboctahedra, edges with six equivalent U(1)C8 hexagonal bipyramids, and faces with four equivalent Ce(1)C12 cuboctahedra. Ce(1) is bonded to four equivalent C(2) and eight equivalent C(1) atoms to form distorted CeC12 cuboctahedra that share edges with six equivalent Ce(1)C12 cuboctahedra, edges with four equivalent U(1)C8 hexagonal bipyramids, faces with four equivalent Ce(1)C12 cuboctahedra, and faces with four equivalent U(1)C8 hexagonal bipyramids. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one U(1), four equivalent Ce(1), and one C(1) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to three equivalent U(1), two equivalent Ce(1), and one C(2) atom. is represented by the CIF file [CIF]
data_CeUC4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.852
_cell_length_b   3.852
_cell_length_c   5.880
_cell_angle_alpha   90.003
_cell_angle_beta   90.003
_cell_angle_gamma   99.738
_symmetry_Int_Tables_number   1
_cell_volume   85.967
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  C  C0  1  0.500  0.500  0.115  1.0
  C  C1  1  0.500  0.500  0.885  1.0
  C  C2  1  0.113  0.887  0.500  1.0
  C  C3  1  0.887  0.113  0.500  1.0
  Ce  Ce4  1  0.000  0.000  0.000  1.0
  U  U5  1  0.500  0.500  0.500  1.0
[/CIF]
.
The material described by UCeC4 crystallizes in the orthorhombic Pmna space group. U(1) is bonded to two equivalent C(1) and six equivalent C(2) atoms to form UC8 hexagonal bipyramids that share edges with four equivalent Ce(1)C12 cuboctahedra, edges with six equivalent U(1)C8 hexagonal bipyramids, and faces with four equivalent Ce(1)C12 cuboctahedra. Ce(1) is bonded to four equivalent C(2) and eight equivalent C(1) atoms to form distorted CeC12 cuboctahedra that share edges with six equivalent Ce(1)C12 cuboctahedra, edges with four equivalent U(1)C8 hexagonal bipyramids, faces with four equivalent Ce(1)C12 cuboctahedra, and faces with four equivalent U(1)C8 hexagonal bipyramids. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one U(1), four equivalent Ce(1), and one C(1) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to three equivalent U(1), two equivalent Ce(1), and one C(2) atom. is represented by the CIF file [CIF]
data_CeUC4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.852
_cell_length_b   3.852
_cell_length_c   5.880
_cell_angle_alpha   90.003
_cell_angle_beta   90.003
_cell_angle_gamma   99.738
_symmetry_Int_Tables_number   1
_cell_volume   85.967
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  C  C0  1  0.500  0.500  0.115  1.0
  C  C1  1  0.500  0.500  0.885  1.0
  C  C2  1  0.113  0.887  0.500  1.0
  C  C3  1  0.887  0.113  0.500  1.0
  Ce  Ce4  1  0.000  0.000  0.000  1.0
  U  U5  1  0.500  0.500  0.500  1.0
[/CIF]
.