The structure described by UO3 is Cementite structured and crystallizes in the orthorhombic P2_12_12_1 space group. U(1) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted linear geometry to two equivalent U(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to three equivalent U(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent U(1) atoms. is represented by the CIF card [CIF]
data_UO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.248
_cell_length_b   5.542
_cell_length_c   7.568
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   220.155
_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  0.784  0.378  0.184  1.0
  U  U1  1  0.284  0.122  0.816  1.0
  U  U2  1  0.216  0.878  0.316  1.0
  U  U3  1  0.716  0.622  0.684  1.0
  O  O4  1  0.416  0.868  0.572  1.0
  O  O5  1  0.916  0.632  0.428  1.0
  O  O6  1  0.584  0.368  0.928  1.0
  O  O7  1  0.084  0.132  0.072  1.0
  O  O8  1  0.432  0.617  0.253  1.0
  O  O9  1  0.932  0.883  0.747  1.0
  O  O10  1  0.568  0.117  0.247  1.0
  O  O11  1  0.068  0.383  0.753  1.0
  O  O12  1  0.533  0.359  0.594  1.0
  O  O13  1  0.033  0.141  0.406  1.0
  O  O14  1  0.467  0.859  0.906  1.0
  O  O15  1  0.967  0.641  0.094  1.0
[/CIF]
.
The structure described by UO3 is Cementite structured and crystallizes in the orthorhombic P2_12_12_1 space group. U(1) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted linear geometry to two equivalent U(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to three equivalent U(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent U(1) atoms. is represented by the CIF card [CIF]
data_UO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.248
_cell_length_b   5.542
_cell_length_c   7.568
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   220.155
_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  0.784  0.378  0.184  1.0
  U  U1  1  0.284  0.122  0.816  1.0
  U  U2  1  0.216  0.878  0.316  1.0
  U  U3  1  0.716  0.622  0.684  1.0
  O  O4  1  0.416  0.868  0.572  1.0
  O  O5  1  0.916  0.632  0.428  1.0
  O  O6  1  0.584  0.368  0.928  1.0
  O  O7  1  0.084  0.132  0.072  1.0
  O  O8  1  0.432  0.617  0.253  1.0
  O  O9  1  0.932  0.883  0.747  1.0
  O  O10  1  0.568  0.117  0.247  1.0
  O  O11  1  0.068  0.383  0.753  1.0
  O  O12  1  0.533  0.359  0.594  1.0
  O  O13  1  0.033  0.141  0.406  1.0
  O  O14  1  0.467  0.859  0.906  1.0
  O  O15  1  0.967  0.641  0.094  1.0
[/CIF]
.