The material described by UO2B8O15 crystallizes in the monoclinic Cc space group. The structure consists of four pitchblend, uranium(iv) oxide, uranium(iv) dioxide, uranium dioxide molecules inside a B8O15 framework. In the B8O15 framework, there are eight inequivalent B sites. In the first B site, B(1) is bonded to one O(11), one O(5), one O(6), and one O(7) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(6) atom. In the third B site, B(3) is bonded to one O(12), one O(2), one O(7), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the fourth B site, B(4) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the fifth B site, B(5) is bonded to one O(12), one O(15), one O(4), and one O(9) atom to form corner-sharing BO4 tetrahedra. In the sixth B site, B(6) is bonded in a trigonal planar geometry to one O(11), one O(13), and one O(9) atom. In the seventh B site, B(7) is bonded in a trigonal planar geometry to one O(13), one O(14), and one O(15) atom. In the eighth B site, B(8) is bonded in a trigonal planar geometry to one O(14), one O(16), and one O(17) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(2) and one B(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(2) and one B(3) atom. In the third O site, O(4) is bonded in a bent 120 degrees geometry to one B(4) and one B(5) atom. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one B(4) atom. In the fifth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one B(1) and one B(2) atom. In the sixth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one B(1) and one B(3) atom. In the seventh O site, O(8) is bonded in a bent 120 degrees geometry to one B(3) and one B(4) atom. In the eighth O site, O(9) is bonded in a bent 120 degrees geometry to one B(5) and one B(6) atom. In the ninth O site, O(11) is bonded in a bent 150 degrees geometry to one B(1) and one B(6) atom. In the tenth O site, O(12) is bonded in a bent 120 degrees geometry to one B(3) and one B(5) atom. In the eleventh O site, O(13) is bonded in a bent 120 degrees geometry to one B(6) and one B(7) atom. In the twelfth O site, O(14) is bonded in a bent 120 degrees geometry to one B(7) and one B(8) atom. In the thirteenth O site, O(15) is bonded in a bent 120 degrees geometry to one B(5) and one B(7) atom. In the fourteenth O site, O(16) is bonded in a single-bond geometry to one B(8) atom. In the fifteenth O site, O(17) is bonded in a single-bond geometry to one B(8) atom. is represented by the CIF file [CIF]
data_UB8O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.977
_cell_length_b   8.977
_cell_length_c   11.125
_cell_angle_alpha   89.990
_cell_angle_beta   89.990
_cell_angle_gamma   136.859
_symmetry_Int_Tables_number   1
_cell_volume   613.055
_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  0.008  0.471  0.246  1.0
  U  U1  1  0.471  0.008  0.746  1.0
  B  B2  1  0.491  0.893  0.310  1.0
  B  B3  1  0.893  0.491  0.810  1.0
  B  B4  1  0.206  0.667  0.947  1.0
  B  B5  1  0.667  0.206  0.447  1.0
  B  B6  1  0.870  0.274  0.983  1.0
  B  B7  1  0.274  0.870  0.483  1.0
  B  B8  1  0.542  0.926  0.082  1.0
  B  B9  1  0.926  0.542  0.582  1.0
  B  B10  1  0.839  0.965  0.994  1.0
  B  B11  1  0.965  0.839  0.494  1.0
  B  B12  1  0.745  0.886  0.416  1.0
  B  B13  1  0.886  0.745  0.916  1.0
  B  B14  1  0.115  0.994  0.077  1.0
  B  B15  1  0.994  0.115  0.577  1.0
  B  B16  1  0.401  0.285  0.214  1.0
  B  B17  1  0.285  0.401  0.714  1.0
  O  O18  1  0.865  0.415  0.471  1.0
  O  O19  1  0.415  0.865  0.971  1.0
  O  O20  1  0.074  0.496  0.027  1.0
  O  O21  1  0.496  0.074  0.527  1.0
  O  O22  1  0.098  0.352  0.276  1.0
  O  O23  1  0.352  0.098  0.776  1.0
  O  O24  1  0.636  0.844  0.064  1.0
  O  O25  1  0.844  0.636  0.564  1.0
  O  O26  1  0.405  0.830  0.188  1.0
  O  O27  1  0.830  0.405  0.688  1.0
  O  O28  1  0.649  0.134  0.333  1.0
  O  O29  1  0.134  0.649  0.833  1.0
  O  O30  1  0.289  0.771  0.385  1.0
  O  O31  1  0.771  0.289  0.885  1.0
  O  O32  1  0.731  0.166  0.090  1.0
  O  O33  1  0.166  0.731  0.590  1.0
  O  O34  1  0.816  0.794  0.408  1.0
  O  O35  1  0.794  0.816  0.908  1.0
  O  O36  1  0.906  0.579  0.218  1.0
  O  O37  1  0.579  0.906  0.718  1.0
  O  O38  1  0.585  0.820  0.341  1.0
  O  O39  1  0.820  0.585  0.841  1.0
  O  O40  1  0.917  0.161  0.935  1.0
  O  O41  1  0.161  0.917  0.435  1.0
  O  O42  1  0.053  0.838  0.999  1.0
  O  O43  1  0.838  0.053  0.499  1.0
  O  O44  1  0.284  0.092  0.155  1.0
  O  O45  1  0.092  0.284  0.655  1.0
  O  O46  1  0.009  0.054  0.081  1.0
  O  O47  1  0.054  0.009  0.581  1.0
  O  O48  1  0.459  0.334  0.331  1.0
  O  O49  1  0.334  0.459  0.831  1.0
  O  O50  1  0.505  0.481  0.164  1.0
  O  O51  1  0.481  0.505  0.664  1.0
[/CIF]
.
The material described by UO2B8O15 crystallizes in the monoclinic Cc space group. The structure consists of four pitchblend, uranium(iv) oxide, uranium(iv) dioxide, uranium dioxide molecules inside a B8O15 framework. In the B8O15 framework, there are eight inequivalent B sites. In the first B site, B(1) is bonded to one O(11), one O(5), one O(6), and one O(7) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(6) atom. In the third B site, B(3) is bonded to one O(12), one O(2), one O(7), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the fourth B site, B(4) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the fifth B site, B(5) is bonded to one O(12), one O(15), one O(4), and one O(9) atom to form corner-sharing BO4 tetrahedra. In the sixth B site, B(6) is bonded in a trigonal planar geometry to one O(11), one O(13), and one O(9) atom. In the seventh B site, B(7) is bonded in a trigonal planar geometry to one O(13), one O(14), and one O(15) atom. In the eighth B site, B(8) is bonded in a trigonal planar geometry to one O(14), one O(16), and one O(17) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(2) and one B(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(2) and one B(3) atom. In the third O site, O(4) is bonded in a bent 120 degrees geometry to one B(4) and one B(5) atom. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one B(4) atom. In the fifth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one B(1) and one B(2) atom. In the sixth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one B(1) and one B(3) atom. In the seventh O site, O(8) is bonded in a bent 120 degrees geometry to one B(3) and one B(4) atom. In the eighth O site, O(9) is bonded in a bent 120 degrees geometry to one B(5) and one B(6) atom. In the ninth O site, O(11) is bonded in a bent 150 degrees geometry to one B(1) and one B(6) atom. In the tenth O site, O(12) is bonded in a bent 120 degrees geometry to one B(3) and one B(5) atom. In the eleventh O site, O(13) is bonded in a bent 120 degrees geometry to one B(6) and one B(7) atom. In the twelfth O site, O(14) is bonded in a bent 120 degrees geometry to one B(7) and one B(8) atom. In the thirteenth O site, O(15) is bonded in a bent 120 degrees geometry to one B(5) and one B(7) atom. In the fourteenth O site, O(16) is bonded in a single-bond geometry to one B(8) atom. In the fifteenth O site, O(17) is bonded in a single-bond geometry to one B(8) atom. is represented by the CIF file [CIF]
data_UB8O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.977
_cell_length_b   8.977
_cell_length_c   11.125
_cell_angle_alpha   89.990
_cell_angle_beta   89.990
_cell_angle_gamma   136.859
_symmetry_Int_Tables_number   1
_cell_volume   613.055
_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  0.008  0.471  0.246  1.0
  U  U1  1  0.471  0.008  0.746  1.0
  B  B2  1  0.491  0.893  0.310  1.0
  B  B3  1  0.893  0.491  0.810  1.0
  B  B4  1  0.206  0.667  0.947  1.0
  B  B5  1  0.667  0.206  0.447  1.0
  B  B6  1  0.870  0.274  0.983  1.0
  B  B7  1  0.274  0.870  0.483  1.0
  B  B8  1  0.542  0.926  0.082  1.0
  B  B9  1  0.926  0.542  0.582  1.0
  B  B10  1  0.839  0.965  0.994  1.0
  B  B11  1  0.965  0.839  0.494  1.0
  B  B12  1  0.745  0.886  0.416  1.0
  B  B13  1  0.886  0.745  0.916  1.0
  B  B14  1  0.115  0.994  0.077  1.0
  B  B15  1  0.994  0.115  0.577  1.0
  B  B16  1  0.401  0.285  0.214  1.0
  B  B17  1  0.285  0.401  0.714  1.0
  O  O18  1  0.865  0.415  0.471  1.0
  O  O19  1  0.415  0.865  0.971  1.0
  O  O20  1  0.074  0.496  0.027  1.0
  O  O21  1  0.496  0.074  0.527  1.0
  O  O22  1  0.098  0.352  0.276  1.0
  O  O23  1  0.352  0.098  0.776  1.0
  O  O24  1  0.636  0.844  0.064  1.0
  O  O25  1  0.844  0.636  0.564  1.0
  O  O26  1  0.405  0.830  0.188  1.0
  O  O27  1  0.830  0.405  0.688  1.0
  O  O28  1  0.649  0.134  0.333  1.0
  O  O29  1  0.134  0.649  0.833  1.0
  O  O30  1  0.289  0.771  0.385  1.0
  O  O31  1  0.771  0.289  0.885  1.0
  O  O32  1  0.731  0.166  0.090  1.0
  O  O33  1  0.166  0.731  0.590  1.0
  O  O34  1  0.816  0.794  0.408  1.0
  O  O35  1  0.794  0.816  0.908  1.0
  O  O36  1  0.906  0.579  0.218  1.0
  O  O37  1  0.579  0.906  0.718  1.0
  O  O38  1  0.585  0.820  0.341  1.0
  O  O39  1  0.820  0.585  0.841  1.0
  O  O40  1  0.917  0.161  0.935  1.0
  O  O41  1  0.161  0.917  0.435  1.0
  O  O42  1  0.053  0.838  0.999  1.0
  O  O43  1  0.838  0.053  0.499  1.0
  O  O44  1  0.284  0.092  0.155  1.0
  O  O45  1  0.092  0.284  0.655  1.0
  O  O46  1  0.009  0.054  0.081  1.0
  O  O47  1  0.054  0.009  0.581  1.0
  O  O48  1  0.459  0.334  0.331  1.0
  O  O49  1  0.334  0.459  0.831  1.0
  O  O50  1  0.505  0.481  0.164  1.0
  O  O51  1  0.481  0.505  0.664  1.0
[/CIF]
.