The structure described by U3O11 crystallizes in the orthorhombic Immm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one O(2), one O(3), one O(4), and four equivalent O(1) atoms to form distorted UO7 pentagonal bipyramids that share  a cornercorner with one U(1)O7 pentagonal bipyramid, corners with two equivalent U(2)O6 square pyramids, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one U(2)O6 square pyramid. In the second U site, U(2) is bonded to one O(5), one O(6), and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing UO6 square pyramids. There are six inequivalent O sites. In the first O site, O(6) is bonded in a linear geometry to one U(2) and one O(6) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one U(2) and two equivalent U(1) atoms. In the third O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent U(1) atoms. In the fourth O site, O(3) is bonded in a single-bond geometry to one U(1) atom. In the fifth O site, O(4) is bonded in a single-bond geometry to one U(1) atom. In the sixth O site, O(5) is bonded in a single-bond geometry to one U(2) atom. is represented by the CIF card [CIF]
data_U3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.047
_cell_length_b   10.047
_cell_length_c   10.047
_cell_angle_alpha   137.642
_cell_angle_beta   111.032
_cell_angle_gamma   84.385
_symmetry_Int_Tables_number   1
_cell_volume   614.699
_cell_formula_units_Z   2
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  0.948  0.268  0.680  1.0
  U  U1  1  0.052  0.732  0.320  1.0
  U  U2  1  0.413  0.732  0.680  1.0
  U  U3  1  0.587  0.268  0.320  1.0
  U  U4  1  0.238  0.238  0.000  1.0
  U  U5  1  0.762  0.762  0.000  1.0
  O  O6  1  0.089  0.407  0.037  1.0
  O  O7  1  0.911  0.949  0.318  1.0
  O  O8  1  0.630  0.593  0.682  1.0
  O  O9  1  0.370  0.051  0.963  1.0
  O  O10  1  0.911  0.593  0.963  1.0
  O  O11  1  0.089  0.051  0.682  1.0
  O  O12  1  0.370  0.407  0.318  1.0
  O  O13  1  0.630  0.949  0.037  1.0
  O  O14  1  0.806  0.306  0.500  1.0
  O  O15  1  0.194  0.694  0.500  1.0
  O  O16  1  0.117  0.382  0.735  1.0
  O  O17  1  0.883  0.618  0.265  1.0
  O  O18  1  0.353  0.618  0.735  1.0
  O  O19  1  0.647  0.382  0.265  1.0
  O  O20  1  0.794  0.150  0.644  1.0
  O  O21  1  0.206  0.850  0.356  1.0
  O  O22  1  0.493  0.850  0.644  1.0
  O  O23  1  0.507  0.150  0.356  1.0
  O  O24  1  0.364  0.364  0.000  1.0
  O  O25  1  0.636  0.636  0.000  1.0
  O  O26  1  0.041  0.041  0.000  1.0
  O  O27  1  0.959  0.959  0.000  1.0
[/CIF]
.
The structure described by U3O11 crystallizes in the orthorhombic Immm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one O(2), one O(3), one O(4), and four equivalent O(1) atoms to form distorted UO7 pentagonal bipyramids that share  a cornercorner with one U(1)O7 pentagonal bipyramid, corners with two equivalent U(2)O6 square pyramids, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one U(2)O6 square pyramid. In the second U site, U(2) is bonded to one O(5), one O(6), and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing UO6 square pyramids. There are six inequivalent O sites. In the first O site, O(6) is bonded in a linear geometry to one U(2) and one O(6) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one U(2) and two equivalent U(1) atoms. In the third O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent U(1) atoms. In the fourth O site, O(3) is bonded in a single-bond geometry to one U(1) atom. In the fifth O site, O(4) is bonded in a single-bond geometry to one U(1) atom. In the sixth O site, O(5) is bonded in a single-bond geometry to one U(2) atom. is represented by the CIF card [CIF]
data_U3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.047
_cell_length_b   10.047
_cell_length_c   10.047
_cell_angle_alpha   137.642
_cell_angle_beta   111.032
_cell_angle_gamma   84.385
_symmetry_Int_Tables_number   1
_cell_volume   614.699
_cell_formula_units_Z   2
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  0.948  0.268  0.680  1.0
  U  U1  1  0.052  0.732  0.320  1.0
  U  U2  1  0.413  0.732  0.680  1.0
  U  U3  1  0.587  0.268  0.320  1.0
  U  U4  1  0.238  0.238  0.000  1.0
  U  U5  1  0.762  0.762  0.000  1.0
  O  O6  1  0.089  0.407  0.037  1.0
  O  O7  1  0.911  0.949  0.318  1.0
  O  O8  1  0.630  0.593  0.682  1.0
  O  O9  1  0.370  0.051  0.963  1.0
  O  O10  1  0.911  0.593  0.963  1.0
  O  O11  1  0.089  0.051  0.682  1.0
  O  O12  1  0.370  0.407  0.318  1.0
  O  O13  1  0.630  0.949  0.037  1.0
  O  O14  1  0.806  0.306  0.500  1.0
  O  O15  1  0.194  0.694  0.500  1.0
  O  O16  1  0.117  0.382  0.735  1.0
  O  O17  1  0.883  0.618  0.265  1.0
  O  O18  1  0.353  0.618  0.735  1.0
  O  O19  1  0.647  0.382  0.265  1.0
  O  O20  1  0.794  0.150  0.644  1.0
  O  O21  1  0.206  0.850  0.356  1.0
  O  O22  1  0.493  0.850  0.644  1.0
  O  O23  1  0.507  0.150  0.356  1.0
  O  O24  1  0.364  0.364  0.000  1.0
  O  O25  1  0.636  0.636  0.000  1.0
  O  O26  1  0.041  0.041  0.000  1.0
  O  O27  1  0.959  0.959  0.000  1.0
[/CIF]
.