The material structure described by UO3 crystallizes in the trigonal P-3m1 space group. U(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent U(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent U(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_UO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.809
_cell_length_b   3.809
_cell_length_c   4.153
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   52.183
_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
  U  U0  1  0.000  0.000  0.000  1.0
  O  O1  1  0.667  0.333  0.887  1.0
  O  O2  1  0.000  0.000  0.500  1.0
  O  O3  1  0.333  0.667  0.113  1.0
[/CIF]
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The material structure described by UO3 crystallizes in the trigonal P-3m1 space group. U(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent U(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent U(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_UO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.809
_cell_length_b   3.809
_cell_length_c   4.153
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   52.183
_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
  U  U0  1  0.000  0.000  0.000  1.0
  O  O1  1  0.667  0.333  0.887  1.0
  O  O2  1  0.000  0.000  0.500  1.0
  O  O3  1  0.333  0.667  0.113  1.0
[/CIF]
.