The crystal structure described by Bi2O3 crystallizes in the triclinic P1 space group. There are eight inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(10), one O(12), one O(2), one O(5), and one O(7) atom. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(3), one O(4), and one O(6) atom. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(6), and one O(8) atom. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(2), one O(3), and one O(7) atom. In the fifth Bi site, Bi(5) is bonded in a 4-coordinate geometry to one O(10), one O(12), one O(4), and one O(9) atom. In the sixth Bi site, Bi(6) is bonded in a T-shaped geometry to one O(11), one O(5), and one O(9) atom. In the seventh Bi site, Bi(7) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(8) atom. In the eighth Bi site, Bi(8) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(7), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted tetrahedral geometry to one Bi(3), one Bi(4), one Bi(7), and one Bi(8) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Bi(1), one Bi(2), one Bi(4), and one Bi(7) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Bi(2), one Bi(4), and one O(5) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Bi(2), one Bi(5), one Bi(7), and one Bi(8) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(6), and one O(3) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Bi(2), one Bi(3), and one Bi(7) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Bi(1), one Bi(4), and one Bi(8) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Bi(3) and one Bi(7) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Bi(5), one Bi(6), and one Bi(8) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(3), one Bi(5), and one Bi(7) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Bi(2), one Bi(4), and one Bi(6) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one Bi(5) atom. is represented by the CIF file [CIF]
data_Bi2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.909
_cell_length_b   7.659
_cell_length_c   8.166
_cell_angle_alpha   107.145
_cell_angle_beta   90.013
_cell_angle_gamma   110.949
_symmetry_Int_Tables_number   1
_cell_volume   382.878
_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  0.801  0.911  0.882  1.0
  Bi  Bi1  1  0.175  0.080  0.620  1.0
  Bi  Bi2  1  0.038  0.523  0.486  1.0
  Bi  Bi3  1  0.585  0.919  0.407  1.0
  Bi  Bi4  1  0.820  0.443  0.936  1.0
  Bi  Bi5  1  0.282  0.967  0.086  1.0
  Bi  Bi6  1  0.551  0.501  0.554  1.0
  Bi  Bi7  1  0.361  0.491  0.058  1.0
  O  O8  1  0.397  0.605  0.349  1.0
  O  O9  1  0.816  0.851  0.586  1.0
  O  O10  1  0.382  0.885  0.661  1.0
  O  O11  1  0.478  0.356  0.779  1.0
  O  O12  1  0.476  0.969  0.844  1.0
  O  O13  1  0.163  0.308  0.501  1.0
  O  O14  1  0.624  0.764  0.115  1.0
  O  O15  1  0.709  0.336  0.379  1.0
  O  O16  1  0.165  0.647  0.019  1.0
  O  O17  1  0.890  0.567  0.729  1.0
  O  O18  1  0.265  0.945  0.368  1.0
  O  O19  1  0.957  0.224  0.896  1.0
[/CIF]
.
The crystal structure described by Bi2O3 crystallizes in the triclinic P1 space group. There are eight inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(10), one O(12), one O(2), one O(5), and one O(7) atom. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(3), one O(4), and one O(6) atom. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(6), and one O(8) atom. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(2), one O(3), and one O(7) atom. In the fifth Bi site, Bi(5) is bonded in a 4-coordinate geometry to one O(10), one O(12), one O(4), and one O(9) atom. In the sixth Bi site, Bi(6) is bonded in a T-shaped geometry to one O(11), one O(5), and one O(9) atom. In the seventh Bi site, Bi(7) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(8) atom. In the eighth Bi site, Bi(8) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(7), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted tetrahedral geometry to one Bi(3), one Bi(4), one Bi(7), and one Bi(8) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Bi(1), one Bi(2), one Bi(4), and one Bi(7) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Bi(2), one Bi(4), and one O(5) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Bi(2), one Bi(5), one Bi(7), and one Bi(8) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1), one Bi(6), and one O(3) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Bi(2), one Bi(3), and one Bi(7) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Bi(1), one Bi(4), and one Bi(8) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Bi(3) and one Bi(7) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Bi(5), one Bi(6), and one Bi(8) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(3), one Bi(5), and one Bi(7) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Bi(2), one Bi(4), and one Bi(6) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one Bi(5) atom. is represented by the CIF file [CIF]
data_Bi2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.909
_cell_length_b   7.659
_cell_length_c   8.166
_cell_angle_alpha   107.145
_cell_angle_beta   90.013
_cell_angle_gamma   110.949
_symmetry_Int_Tables_number   1
_cell_volume   382.878
_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  0.801  0.911  0.882  1.0
  Bi  Bi1  1  0.175  0.080  0.620  1.0
  Bi  Bi2  1  0.038  0.523  0.486  1.0
  Bi  Bi3  1  0.585  0.919  0.407  1.0
  Bi  Bi4  1  0.820  0.443  0.936  1.0
  Bi  Bi5  1  0.282  0.967  0.086  1.0
  Bi  Bi6  1  0.551  0.501  0.554  1.0
  Bi  Bi7  1  0.361  0.491  0.058  1.0
  O  O8  1  0.397  0.605  0.349  1.0
  O  O9  1  0.816  0.851  0.586  1.0
  O  O10  1  0.382  0.885  0.661  1.0
  O  O11  1  0.478  0.356  0.779  1.0
  O  O12  1  0.476  0.969  0.844  1.0
  O  O13  1  0.163  0.308  0.501  1.0
  O  O14  1  0.624  0.764  0.115  1.0
  O  O15  1  0.709  0.336  0.379  1.0
  O  O16  1  0.165  0.647  0.019  1.0
  O  O17  1  0.890  0.567  0.729  1.0
  O  O18  1  0.265  0.945  0.368  1.0
  O  O19  1  0.957  0.224  0.896  1.0
[/CIF]
.