The crystal structure described by U(BiO2)4 crystallizes in the orthorhombic Immm space group. U(1) is bonded in a body-centered cubic geometry to four equivalent O(3) and four equivalent O(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Bi site, Bi(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles are 59°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form OBi4 tetrahedra that share corners with two equivalent O(3)U2Bi2 tetrahedra, corners with four equivalent O(1)Bi4 tetrahedra, corners with four equivalent O(4)U2Bi2 tetrahedra, corners with six equivalent O(2)Bi4 tetrahedra,  an edgeedge with one O(2)Bi4 tetrahedra, and  an edgeedge with one O(3)U2Bi2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the third O site, O(3) is bonded to two equivalent U(1) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(1)Bi4 tetrahedra, corners with four equivalent O(4)U2Bi2 tetrahedra, corners with six equivalent O(3)U2Bi2 tetrahedra,  an edgeedge with one O(1)Bi4 tetrahedra,  an edgeedge with one O(3)U2Bi2 tetrahedra, and edges with four equivalent O(4)U2Bi2 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent U(1) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with four equivalent O(1)Bi4 tetrahedra, corners with four equivalent O(3)U2Bi2 tetrahedra, corners with six equivalent O(4)U2Bi2 tetrahedra,  an edgeedge with one O(4)U2Bi2 tetrahedra, and edges with four equivalent O(3)U2Bi2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_U(BiO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.430
_cell_length_b   14.430
_cell_length_c   14.430
_cell_angle_alpha   164.685
_cell_angle_beta   164.249
_cell_angle_gamma   22.037
_symmetry_Int_Tables_number   1
_cell_volume   215.399
_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
  Bi  Bi1  1  0.595  0.595  0.000  1.0
  Bi  Bi2  1  0.204  0.204  0.000  1.0
  Bi  Bi3  1  0.796  0.796  0.000  1.0
  Bi  Bi4  1  0.405  0.405  0.000  1.0
  O  O5  1  0.148  0.648  0.500  1.0
  O  O6  1  0.744  0.244  0.500  1.0
  O  O7  1  0.955  0.455  0.500  1.0
  O  O8  1  0.452  0.952  0.500  1.0
  O  O9  1  0.548  0.048  0.500  1.0
  O  O10  1  0.045  0.545  0.500  1.0
  O  O11  1  0.256  0.756  0.500  1.0
  O  O12  1  0.852  0.352  0.500  1.0
[/CIF]
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The crystal structure described by U(BiO2)4 crystallizes in the orthorhombic Immm space group. U(1) is bonded in a body-centered cubic geometry to four equivalent O(3) and four equivalent O(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Bi site, Bi(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles are 59°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form OBi4 tetrahedra that share corners with two equivalent O(3)U2Bi2 tetrahedra, corners with four equivalent O(1)Bi4 tetrahedra, corners with four equivalent O(4)U2Bi2 tetrahedra, corners with six equivalent O(2)Bi4 tetrahedra,  an edgeedge with one O(2)Bi4 tetrahedra, and  an edgeedge with one O(3)U2Bi2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the third O site, O(3) is bonded to two equivalent U(1) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(1)Bi4 tetrahedra, corners with four equivalent O(4)U2Bi2 tetrahedra, corners with six equivalent O(3)U2Bi2 tetrahedra,  an edgeedge with one O(1)Bi4 tetrahedra,  an edgeedge with one O(3)U2Bi2 tetrahedra, and edges with four equivalent O(4)U2Bi2 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent U(1) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with four equivalent O(1)Bi4 tetrahedra, corners with four equivalent O(3)U2Bi2 tetrahedra, corners with six equivalent O(4)U2Bi2 tetrahedra,  an edgeedge with one O(4)U2Bi2 tetrahedra, and edges with four equivalent O(3)U2Bi2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_U(BiO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.430
_cell_length_b   14.430
_cell_length_c   14.430
_cell_angle_alpha   164.685
_cell_angle_beta   164.249
_cell_angle_gamma   22.037
_symmetry_Int_Tables_number   1
_cell_volume   215.399
_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
  Bi  Bi1  1  0.595  0.595  0.000  1.0
  Bi  Bi2  1  0.204  0.204  0.000  1.0
  Bi  Bi3  1  0.796  0.796  0.000  1.0
  Bi  Bi4  1  0.405  0.405  0.000  1.0
  O  O5  1  0.148  0.648  0.500  1.0
  O  O6  1  0.744  0.244  0.500  1.0
  O  O7  1  0.955  0.455  0.500  1.0
  O  O8  1  0.452  0.952  0.500  1.0
  O  O9  1  0.548  0.048  0.500  1.0
  O  O10  1  0.045  0.545  0.500  1.0
  O  O11  1  0.256  0.756  0.500  1.0
  O  O12  1  0.852  0.352  0.500  1.0
[/CIF]
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