The compound described by B2Se2O7 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form corner-sharing BO4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the second Se site, Se(2) is bonded in a distorted T-shaped geometry to one O(1), one O(6), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(2) and one Se(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one B(1) and one Se(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one B(2) and one Se(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one B(1) and one Se(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one B(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one B(2) and one Se(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_B2Se2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.542
_cell_length_b   7.914
_cell_length_c   9.066
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   541.083
_cell_formula_units_Z   4
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
  B  B0  1  0.097  0.950  0.853  1.0
  B  B1  1  0.072  0.983  0.356  1.0
  B  B2  1  0.903  0.450  0.647  1.0
  B  B3  1  0.597  0.550  0.147  1.0
  B  B4  1  0.428  0.017  0.856  1.0
  B  B5  1  0.928  0.483  0.144  1.0
  B  B6  1  0.572  0.517  0.644  1.0
  B  B7  1  0.403  0.050  0.353  1.0
  Se  Se8  1  0.593  0.895  0.124  1.0
  Se  Se9  1  0.075  0.168  0.098  1.0
  Se  Se10  1  0.925  0.668  0.402  1.0
  Se  Se11  1  0.425  0.832  0.598  1.0
  Se  Se12  1  0.407  0.395  0.376  1.0
  Se  Se13  1  0.907  0.105  0.624  1.0
  Se  Se14  1  0.575  0.332  0.902  1.0
  Se  Se15  1  0.093  0.605  0.876  1.0
  O  O16  1  0.995  0.499  0.299  1.0
  O  O17  1  0.512  0.202  0.389  1.0
  O  O18  1  0.912  0.035  0.446  1.0
  O  O19  1  0.417  0.012  0.191  1.0
  O  O20  1  0.917  0.488  0.809  1.0
  O  O21  1  0.223  0.080  0.389  1.0
  O  O22  1  0.088  0.535  0.054  1.0
  O  O23  1  0.988  0.798  0.889  1.0
  O  O24  1  0.412  0.465  0.554  1.0
  O  O25  1  0.007  0.094  0.929  1.0
  O  O26  1  0.488  0.702  0.111  1.0
  O  O27  1  0.507  0.406  0.071  1.0
  O  O28  1  0.993  0.594  0.571  1.0
  O  O29  1  0.083  0.988  0.691  1.0
  O  O30  1  0.012  0.298  0.611  1.0
  O  O31  1  0.106  0.799  0.381  1.0
  O  O32  1  0.588  0.965  0.946  1.0
  O  O33  1  0.493  0.906  0.429  1.0
  O  O34  1  0.583  0.512  0.309  1.0
  O  O35  1  0.005  0.999  0.201  1.0
  O  O36  1  0.277  0.920  0.889  1.0
  O  O37  1  0.894  0.299  0.119  1.0
  O  O38  1  0.723  0.420  0.611  1.0
  O  O39  1  0.505  0.501  0.799  1.0
  O  O40  1  0.777  0.580  0.111  1.0
  O  O41  1  0.495  0.001  0.701  1.0
  O  O42  1  0.606  0.701  0.619  1.0
  O  O43  1  0.394  0.201  0.881  1.0
[/CIF]
.
The compound described by B2Se2O7 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form corner-sharing BO4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the second Se site, Se(2) is bonded in a distorted T-shaped geometry to one O(1), one O(6), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(2) and one Se(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one B(1) and one Se(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one B(2) and one Se(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one B(1) and one Se(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one B(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one B(2) and one Se(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_B2Se2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.542
_cell_length_b   7.914
_cell_length_c   9.066
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   541.083
_cell_formula_units_Z   4
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
  B  B0  1  0.097  0.950  0.853  1.0
  B  B1  1  0.072  0.983  0.356  1.0
  B  B2  1  0.903  0.450  0.647  1.0
  B  B3  1  0.597  0.550  0.147  1.0
  B  B4  1  0.428  0.017  0.856  1.0
  B  B5  1  0.928  0.483  0.144  1.0
  B  B6  1  0.572  0.517  0.644  1.0
  B  B7  1  0.403  0.050  0.353  1.0
  Se  Se8  1  0.593  0.895  0.124  1.0
  Se  Se9  1  0.075  0.168  0.098  1.0
  Se  Se10  1  0.925  0.668  0.402  1.0
  Se  Se11  1  0.425  0.832  0.598  1.0
  Se  Se12  1  0.407  0.395  0.376  1.0
  Se  Se13  1  0.907  0.105  0.624  1.0
  Se  Se14  1  0.575  0.332  0.902  1.0
  Se  Se15  1  0.093  0.605  0.876  1.0
  O  O16  1  0.995  0.499  0.299  1.0
  O  O17  1  0.512  0.202  0.389  1.0
  O  O18  1  0.912  0.035  0.446  1.0
  O  O19  1  0.417  0.012  0.191  1.0
  O  O20  1  0.917  0.488  0.809  1.0
  O  O21  1  0.223  0.080  0.389  1.0
  O  O22  1  0.088  0.535  0.054  1.0
  O  O23  1  0.988  0.798  0.889  1.0
  O  O24  1  0.412  0.465  0.554  1.0
  O  O25  1  0.007  0.094  0.929  1.0
  O  O26  1  0.488  0.702  0.111  1.0
  O  O27  1  0.507  0.406  0.071  1.0
  O  O28  1  0.993  0.594  0.571  1.0
  O  O29  1  0.083  0.988  0.691  1.0
  O  O30  1  0.012  0.298  0.611  1.0
  O  O31  1  0.106  0.799  0.381  1.0
  O  O32  1  0.588  0.965  0.946  1.0
  O  O33  1  0.493  0.906  0.429  1.0
  O  O34  1  0.583  0.512  0.309  1.0
  O  O35  1  0.005  0.999  0.201  1.0
  O  O36  1  0.277  0.920  0.889  1.0
  O  O37  1  0.894  0.299  0.119  1.0
  O  O38  1  0.723  0.420  0.611  1.0
  O  O39  1  0.505  0.501  0.799  1.0
  O  O40  1  0.777  0.580  0.111  1.0
  O  O41  1  0.495  0.001  0.701  1.0
  O  O42  1  0.606  0.701  0.619  1.0
  O  O43  1  0.394  0.201  0.881  1.0
[/CIF]
.