The material described by UCrC2 crystallizes in the orthorhombic Pnma space group. U(1) is bonded to three equivalent C(2) and four equivalent C(1) atoms to form distorted UC7 pentagonal bipyramids that share corners with four equivalent U(1)C7 pentagonal bipyramids, corners with three equivalent Cr(1)C5 trigonal bipyramids, edges with four equivalent U(1)C7 pentagonal bipyramids, edges with seven equivalent Cr(1)C5 trigonal bipyramids, and faces with two equivalent U(1)C7 pentagonal bipyramids. Cr(1) is bonded to two equivalent C(1) and three equivalent C(2) atoms to form CrC5 trigonal bipyramids that share corners with three equivalent U(1)C7 pentagonal bipyramids, corners with four equivalent Cr(1)C5 trigonal bipyramids, edges with seven equivalent U(1)C7 pentagonal bipyramids, and edges with two equivalent Cr(1)C5 trigonal bipyramids. There are two inequivalent C sites. In the first C site, C(1) is bonded to four equivalent U(1) and two equivalent Cr(1) atoms to form CU4Cr2 octahedra that share corners with four equivalent C(1)U4Cr2 octahedra, corners with nine equivalent C(2)U3Cr3 octahedra, edges with two equivalent C(1)U4Cr2 octahedra, edges with three equivalent C(2)U3Cr3 octahedra,  a faceface with one C(2)U3Cr3 octahedra, and faces with two equivalent C(1)U4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 13-61°. In the second C site, C(2) is bonded to three equivalent U(1) and three equivalent Cr(1) atoms to form CU3Cr3 octahedra that share corners with nine equivalent C(1)U4Cr2 octahedra, edges with three equivalent C(1)U4Cr2 octahedra, edges with six equivalent C(2)U3Cr3 octahedra, and  a faceface with one C(1)U4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 13-61°. is represented by the CIF card [CIF]
data_UCrC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.138
_cell_length_b   5.472
_cell_length_c   10.716
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   184.037
_cell_formula_units_Z   4
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
  U  U0  1  0.750  0.421  0.641  1.0
  U  U1  1  0.750  0.921  0.859  1.0
  U  U2  1  0.250  0.579  0.359  1.0
  U  U3  1  0.250  0.079  0.141  1.0
  Cr  Cr4  1  0.750  0.076  0.401  1.0
  Cr  Cr5  1  0.750  0.576  0.099  1.0
  Cr  Cr6  1  0.250  0.924  0.599  1.0
  Cr  Cr7  1  0.250  0.424  0.901  1.0
  C  C8  1  0.750  0.334  0.254  1.0
  C  C9  1  0.750  0.834  0.246  1.0
  C  C10  1  0.250  0.666  0.746  1.0
  C  C11  1  0.250  0.166  0.754  1.0
  C  C12  1  0.750  0.772  0.510  1.0
  C  C13  1  0.750  0.272  0.990  1.0
  C  C14  1  0.250  0.228  0.490  1.0
  C  C15  1  0.250  0.728  0.010  1.0
[/CIF]
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The material described by UCrC2 crystallizes in the orthorhombic Pnma space group. U(1) is bonded to three equivalent C(2) and four equivalent C(1) atoms to form distorted UC7 pentagonal bipyramids that share corners with four equivalent U(1)C7 pentagonal bipyramids, corners with three equivalent Cr(1)C5 trigonal bipyramids, edges with four equivalent U(1)C7 pentagonal bipyramids, edges with seven equivalent Cr(1)C5 trigonal bipyramids, and faces with two equivalent U(1)C7 pentagonal bipyramids. Cr(1) is bonded to two equivalent C(1) and three equivalent C(2) atoms to form CrC5 trigonal bipyramids that share corners with three equivalent U(1)C7 pentagonal bipyramids, corners with four equivalent Cr(1)C5 trigonal bipyramids, edges with seven equivalent U(1)C7 pentagonal bipyramids, and edges with two equivalent Cr(1)C5 trigonal bipyramids. There are two inequivalent C sites. In the first C site, C(1) is bonded to four equivalent U(1) and two equivalent Cr(1) atoms to form CU4Cr2 octahedra that share corners with four equivalent C(1)U4Cr2 octahedra, corners with nine equivalent C(2)U3Cr3 octahedra, edges with two equivalent C(1)U4Cr2 octahedra, edges with three equivalent C(2)U3Cr3 octahedra,  a faceface with one C(2)U3Cr3 octahedra, and faces with two equivalent C(1)U4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 13-61°. In the second C site, C(2) is bonded to three equivalent U(1) and three equivalent Cr(1) atoms to form CU3Cr3 octahedra that share corners with nine equivalent C(1)U4Cr2 octahedra, edges with three equivalent C(1)U4Cr2 octahedra, edges with six equivalent C(2)U3Cr3 octahedra, and  a faceface with one C(1)U4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 13-61°. is represented by the CIF card [CIF]
data_UCrC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.138
_cell_length_b   5.472
_cell_length_c   10.716
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   184.037
_cell_formula_units_Z   4
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
  U  U0  1  0.750  0.421  0.641  1.0
  U  U1  1  0.750  0.921  0.859  1.0
  U  U2  1  0.250  0.579  0.359  1.0
  U  U3  1  0.250  0.079  0.141  1.0
  Cr  Cr4  1  0.750  0.076  0.401  1.0
  Cr  Cr5  1  0.750  0.576  0.099  1.0
  Cr  Cr6  1  0.250  0.924  0.599  1.0
  Cr  Cr7  1  0.250  0.424  0.901  1.0
  C  C8  1  0.750  0.334  0.254  1.0
  C  C9  1  0.750  0.834  0.246  1.0
  C  C10  1  0.250  0.666  0.746  1.0
  C  C11  1  0.250  0.166  0.754  1.0
  C  C12  1  0.750  0.772  0.510  1.0
  C  C13  1  0.750  0.272  0.990  1.0
  C  C14  1  0.250  0.228  0.490  1.0
  C  C15  1  0.250  0.728  0.010  1.0
[/CIF]
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