The material structure described by U crystallizes in the orthorhombic Pmma space group. There are five inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(1), two equivalent U(4), and four equivalent U(3) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the second U site, U(2) is bonded to two equivalent U(2), two equivalent U(4), and four equivalent U(5) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the third U site, U(3) is bonded to one U(5), two equivalent U(1), two equivalent U(4), and three equivalent U(3) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. In the fourth U site, U(4) is bonded to one U(1), one U(2), two equivalent U(3), two equivalent U(4), and two equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. In the fifth U site, U(5) is bonded to one U(3), two equivalent U(2), two equivalent U(4), and three equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. is represented by the CIF file [CIF]
data_U
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.043
_cell_length_b   5.822
_cell_length_c   6.395
_cell_angle_alpha   117.078
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   167.182
_cell_formula_units_Z   8
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  1.000  0.218  0.000  1.0
  U  U1  1  1.000  0.782  0.000  1.0
  U  U2  1  0.500  0.403  0.247  1.0
  U  U3  1  0.500  0.156  0.753  1.0
  U  U4  1  0.500  0.597  0.753  1.0
  U  U5  1  0.500  0.844  0.247  1.0
  U  U6  1  1.000  0.500  0.500  1.0
  U  U7  1  0.000  0.000  0.500  1.0
[/CIF]
.
The material structure described by U crystallizes in the orthorhombic Pmma space group. There are five inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(1), two equivalent U(4), and four equivalent U(3) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the second U site, U(2) is bonded to two equivalent U(2), two equivalent U(4), and four equivalent U(5) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the third U site, U(3) is bonded to one U(5), two equivalent U(1), two equivalent U(4), and three equivalent U(3) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. In the fourth U site, U(4) is bonded to one U(1), one U(2), two equivalent U(3), two equivalent U(4), and two equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. In the fifth U site, U(5) is bonded to one U(3), two equivalent U(2), two equivalent U(4), and three equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. is represented by the CIF file [CIF]
data_U
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.043
_cell_length_b   5.822
_cell_length_c   6.395
_cell_angle_alpha   117.078
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   167.182
_cell_formula_units_Z   8
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  1.000  0.218  0.000  1.0
  U  U1  1  1.000  0.782  0.000  1.0
  U  U2  1  0.500  0.403  0.247  1.0
  U  U3  1  0.500  0.156  0.753  1.0
  U  U4  1  0.500  0.597  0.753  1.0
  U  U5  1  0.500  0.844  0.247  1.0
  U  U6  1  1.000  0.500  0.500  1.0
  U  U7  1  0.000  0.000  0.500  1.0
[/CIF]
.