The structure described by UCo3 crystallizes in the trigonal R-3m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to three equivalent Co(3) and nine equivalent Co(1) atoms. In the second U site, U(2) is bonded in a distorted hexagonal planar geometry to six equivalent Co(2) and twelve equivalent Co(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent U(2), three equivalent U(1), one Co(3), two equivalent Co(2), and four equivalent Co(1) atoms to form distorted CoU5Co7 cuboctahedra that share corners with two equivalent Co(3)U6Co6 cuboctahedra, corners with four equivalent Co(2)U3Co9 cuboctahedra, corners with fifteen equivalent Co(1)U5Co7 cuboctahedra, edges with eight equivalent Co(1)U5Co7 cuboctahedra, faces with three equivalent Co(3)U6Co6 cuboctahedra, faces with six equivalent Co(2)U3Co9 cuboctahedra, and faces with eleven equivalent Co(1)U5Co7 cuboctahedra. In the second Co site, Co(2) is bonded to three equivalent U(2), three equivalent Co(2), and six equivalent Co(1) atoms to form distorted CoU3Co9 cuboctahedra that share corners with three equivalent Co(2)U3Co9 cuboctahedra, corners with three equivalent Co(3)U6Co6 cuboctahedra, corners with twelve equivalent Co(1)U5Co7 cuboctahedra, edges with six equivalent Co(2)U3Co9 cuboctahedra,  a faceface with one Co(3)U6Co6 cuboctahedra, faces with three equivalent Co(2)U3Co9 cuboctahedra, and faces with eighteen equivalent Co(1)U5Co7 cuboctahedra. In the third Co site, Co(3) is bonded to six equivalent U(1) and six equivalent Co(1) atoms to form CoU6Co6 cuboctahedra that share corners with six equivalent Co(2)U3Co9 cuboctahedra, corners with twelve equivalent Co(1)U5Co7 cuboctahedra, edges with six equivalent Co(3)U6Co6 cuboctahedra, faces with two equivalent Co(2)U3Co9 cuboctahedra, and faces with eighteen equivalent Co(1)U5Co7 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_UCo3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.795
_cell_length_b   4.795
_cell_length_c   8.580
_cell_angle_alpha   73.776
_cell_angle_beta   73.776
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   161.695
_cell_formula_units_Z   3
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  0.859  0.859  0.422  1.0
  U  U1  1  0.141  0.141  0.578  1.0
  U  U2  1  0.000  0.000  0.000  1.0
  Co  Co3  1  0.417  0.417  0.249  1.0
  Co  Co4  1  0.916  0.417  0.249  1.0
  Co  Co5  1  0.417  0.916  0.249  1.0
  Co  Co6  1  0.583  0.583  0.751  1.0
  Co  Co7  1  0.084  0.583  0.751  1.0
  Co  Co8  1  0.583  0.084  0.751  1.0
  Co  Co9  1  0.666  0.666  0.001  1.0
  Co  Co10  1  0.334  0.334  0.999  1.0
  Co  Co11  1  0.500  0.500  0.500  1.0
[/CIF]
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The structure described by UCo3 crystallizes in the trigonal R-3m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to three equivalent Co(3) and nine equivalent Co(1) atoms. In the second U site, U(2) is bonded in a distorted hexagonal planar geometry to six equivalent Co(2) and twelve equivalent Co(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent U(2), three equivalent U(1), one Co(3), two equivalent Co(2), and four equivalent Co(1) atoms to form distorted CoU5Co7 cuboctahedra that share corners with two equivalent Co(3)U6Co6 cuboctahedra, corners with four equivalent Co(2)U3Co9 cuboctahedra, corners with fifteen equivalent Co(1)U5Co7 cuboctahedra, edges with eight equivalent Co(1)U5Co7 cuboctahedra, faces with three equivalent Co(3)U6Co6 cuboctahedra, faces with six equivalent Co(2)U3Co9 cuboctahedra, and faces with eleven equivalent Co(1)U5Co7 cuboctahedra. In the second Co site, Co(2) is bonded to three equivalent U(2), three equivalent Co(2), and six equivalent Co(1) atoms to form distorted CoU3Co9 cuboctahedra that share corners with three equivalent Co(2)U3Co9 cuboctahedra, corners with three equivalent Co(3)U6Co6 cuboctahedra, corners with twelve equivalent Co(1)U5Co7 cuboctahedra, edges with six equivalent Co(2)U3Co9 cuboctahedra,  a faceface with one Co(3)U6Co6 cuboctahedra, faces with three equivalent Co(2)U3Co9 cuboctahedra, and faces with eighteen equivalent Co(1)U5Co7 cuboctahedra. In the third Co site, Co(3) is bonded to six equivalent U(1) and six equivalent Co(1) atoms to form CoU6Co6 cuboctahedra that share corners with six equivalent Co(2)U3Co9 cuboctahedra, corners with twelve equivalent Co(1)U5Co7 cuboctahedra, edges with six equivalent Co(3)U6Co6 cuboctahedra, faces with two equivalent Co(2)U3Co9 cuboctahedra, and faces with eighteen equivalent Co(1)U5Co7 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_UCo3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.795
_cell_length_b   4.795
_cell_length_c   8.580
_cell_angle_alpha   73.776
_cell_angle_beta   73.776
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   161.695
_cell_formula_units_Z   3
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  0.859  0.859  0.422  1.0
  U  U1  1  0.141  0.141  0.578  1.0
  U  U2  1  0.000  0.000  0.000  1.0
  Co  Co3  1  0.417  0.417  0.249  1.0
  Co  Co4  1  0.916  0.417  0.249  1.0
  Co  Co5  1  0.417  0.916  0.249  1.0
  Co  Co6  1  0.583  0.583  0.751  1.0
  Co  Co7  1  0.084  0.583  0.751  1.0
  Co  Co8  1  0.583  0.084  0.751  1.0
  Co  Co9  1  0.666  0.666  0.001  1.0
  Co  Co10  1  0.334  0.334  0.999  1.0
  Co  Co11  1  0.500  0.500  0.500  1.0
[/CIF]
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