The material described by Bi2SeO7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(7) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(5), one O(6), and one O(7) atom. Se(1) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 2-coordinate geometry to one Bi(2) and one Se(1) atom. In the second O site, O(7) is bonded in a distorted trigonal planar geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Bi(2) and two equivalent Bi(1) atoms. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Bi(1) and one Bi(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one Se(1) atom. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(1) and one Se(1) atom. In the seventh O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Bi(2) and one Se(1) atom. is represented by the CIF card [CIF]
data_Bi2SeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.014
_cell_length_b   8.408
_cell_length_c   13.082
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   112.028
_symmetry_Int_Tables_number   1
_cell_volume   613.178
_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
  Bi  Bi0  1  0.445  0.045  0.134  1.0
  Bi  Bi1  1  0.555  0.955  0.866  1.0
  Bi  Bi2  1  0.055  0.955  0.634  1.0
  Bi  Bi3  1  0.945  0.045  0.366  1.0
  Bi  Bi4  1  0.206  0.714  0.377  1.0
  Bi  Bi5  1  0.794  0.286  0.623  1.0
  Bi  Bi6  1  0.294  0.286  0.877  1.0
  Bi  Bi7  1  0.706  0.714  0.123  1.0
  Se  Se8  1  0.081  0.372  0.139  1.0
  Se  Se9  1  0.919  0.628  0.861  1.0
  Se  Se10  1  0.419  0.628  0.639  1.0
  Se  Se11  1  0.581  0.372  0.361  1.0
  O  O12  1  0.930  0.122  0.535  1.0
  O  O13  1  0.070  0.878  0.465  1.0
  O  O14  1  0.570  0.878  0.035  1.0
  O  O15  1  0.430  0.122  0.965  1.0
  O  O16  1  0.429  0.114  0.598  1.0
  O  O17  1  0.571  0.886  0.402  1.0
  O  O18  1  0.071  0.886  0.098  1.0
  O  O19  1  0.929  0.114  0.902  1.0
  O  O20  1  0.314  0.291  0.418  1.0
  O  O21  1  0.686  0.709  0.582  1.0
  O  O22  1  0.186  0.709  0.918  1.0
  O  O23  1  0.814  0.291  0.082  1.0
  O  O24  1  0.135  0.225  0.212  1.0
  O  O25  1  0.865  0.775  0.788  1.0
  O  O26  1  0.365  0.775  0.712  1.0
  O  O27  1  0.635  0.225  0.288  1.0
  O  O28  1  0.116  0.553  0.202  1.0
  O  O29  1  0.884  0.447  0.798  1.0
  O  O30  1  0.384  0.447  0.702  1.0
  O  O31  1  0.616  0.553  0.298  1.0
  O  O32  1  0.299  0.423  0.049  1.0
  O  O33  1  0.701  0.577  0.951  1.0
  O  O34  1  0.201  0.577  0.549  1.0
  O  O35  1  0.799  0.423  0.451  1.0
  O  O36  1  0.368  0.097  0.770  1.0
  O  O37  1  0.632  0.903  0.230  1.0
  O  O38  1  0.132  0.903  0.270  1.0
  O  O39  1  0.868  0.097  0.730  1.0
[/CIF]
.
The material described by Bi2SeO7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(7) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(5), one O(6), and one O(7) atom. Se(1) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 2-coordinate geometry to one Bi(2) and one Se(1) atom. In the second O site, O(7) is bonded in a distorted trigonal planar geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Bi(2) and two equivalent Bi(1) atoms. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Bi(1) and one Bi(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one Se(1) atom. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(1) and one Se(1) atom. In the seventh O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Bi(2) and one Se(1) atom. is represented by the CIF card [CIF]
data_Bi2SeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.014
_cell_length_b   8.408
_cell_length_c   13.082
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   112.028
_symmetry_Int_Tables_number   1
_cell_volume   613.178
_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
  Bi  Bi0  1  0.445  0.045  0.134  1.0
  Bi  Bi1  1  0.555  0.955  0.866  1.0
  Bi  Bi2  1  0.055  0.955  0.634  1.0
  Bi  Bi3  1  0.945  0.045  0.366  1.0
  Bi  Bi4  1  0.206  0.714  0.377  1.0
  Bi  Bi5  1  0.794  0.286  0.623  1.0
  Bi  Bi6  1  0.294  0.286  0.877  1.0
  Bi  Bi7  1  0.706  0.714  0.123  1.0
  Se  Se8  1  0.081  0.372  0.139  1.0
  Se  Se9  1  0.919  0.628  0.861  1.0
  Se  Se10  1  0.419  0.628  0.639  1.0
  Se  Se11  1  0.581  0.372  0.361  1.0
  O  O12  1  0.930  0.122  0.535  1.0
  O  O13  1  0.070  0.878  0.465  1.0
  O  O14  1  0.570  0.878  0.035  1.0
  O  O15  1  0.430  0.122  0.965  1.0
  O  O16  1  0.429  0.114  0.598  1.0
  O  O17  1  0.571  0.886  0.402  1.0
  O  O18  1  0.071  0.886  0.098  1.0
  O  O19  1  0.929  0.114  0.902  1.0
  O  O20  1  0.314  0.291  0.418  1.0
  O  O21  1  0.686  0.709  0.582  1.0
  O  O22  1  0.186  0.709  0.918  1.0
  O  O23  1  0.814  0.291  0.082  1.0
  O  O24  1  0.135  0.225  0.212  1.0
  O  O25  1  0.865  0.775  0.788  1.0
  O  O26  1  0.365  0.775  0.712  1.0
  O  O27  1  0.635  0.225  0.288  1.0
  O  O28  1  0.116  0.553  0.202  1.0
  O  O29  1  0.884  0.447  0.798  1.0
  O  O30  1  0.384  0.447  0.702  1.0
  O  O31  1  0.616  0.553  0.298  1.0
  O  O32  1  0.299  0.423  0.049  1.0
  O  O33  1  0.701  0.577  0.951  1.0
  O  O34  1  0.201  0.577  0.549  1.0
  O  O35  1  0.799  0.423  0.451  1.0
  O  O36  1  0.368  0.097  0.770  1.0
  O  O37  1  0.632  0.903  0.230  1.0
  O  O38  1  0.132  0.903  0.270  1.0
  O  O39  1  0.868  0.097  0.730  1.0
[/CIF]
.