The compound described by B2Bi2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(5), and one O(6) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(7) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), 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 150 degrees geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one B(2), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one B(2), one Bi(1), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one B(1) and one Bi(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one B(1), one Bi(1), and one Bi(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one B(2), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_Bi2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.391
_cell_length_b   6.602
_cell_length_c   7.432
_cell_angle_alpha   79.556
_cell_angle_beta   81.171
_cell_angle_gamma   87.414
_symmetry_Int_Tables_number   1
_cell_volume   304.719
_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
  Bi  Bi0  1  0.177  0.276  0.275  1.0
  Bi  Bi1  1  0.585  0.753  0.263  1.0
  Bi  Bi2  1  0.415  0.247  0.737  1.0
  Bi  Bi3  1  0.823  0.724  0.725  1.0
  B  B4  1  0.677  0.216  0.273  1.0
  B  B5  1  0.104  0.761  0.333  1.0
  B  B6  1  0.896  0.239  0.667  1.0
  B  B7  1  0.323  0.784  0.727  1.0
  O  O8  1  0.716  0.680  0.002  1.0
  O  O9  1  0.842  0.335  0.294  1.0
  O  O10  1  0.227  0.934  0.321  1.0
  O  O11  1  0.216  0.610  0.253  1.0
  O  O12  1  0.694  0.064  0.173  1.0
  O  O13  1  0.486  0.282  0.370  1.0
  O  O14  1  0.895  0.742  0.418  1.0
  O  O15  1  0.105  0.258  0.582  1.0
  O  O16  1  0.514  0.718  0.630  1.0
  O  O17  1  0.306  0.936  0.827  1.0
  O  O18  1  0.784  0.390  0.747  1.0
  O  O19  1  0.773  0.066  0.679  1.0
  O  O20  1  0.158  0.665  0.706  1.0
  O  O21  1  0.284  0.320  0.998  1.0
[/CIF]
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The compound described by B2Bi2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(5), and one O(6) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(7) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), 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 150 degrees geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one B(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one B(2), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one B(2), one Bi(1), and one Bi(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one B(1) and one Bi(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one B(1), one Bi(1), and one Bi(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one B(2), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_Bi2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.391
_cell_length_b   6.602
_cell_length_c   7.432
_cell_angle_alpha   79.556
_cell_angle_beta   81.171
_cell_angle_gamma   87.414
_symmetry_Int_Tables_number   1
_cell_volume   304.719
_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
  Bi  Bi0  1  0.177  0.276  0.275  1.0
  Bi  Bi1  1  0.585  0.753  0.263  1.0
  Bi  Bi2  1  0.415  0.247  0.737  1.0
  Bi  Bi3  1  0.823  0.724  0.725  1.0
  B  B4  1  0.677  0.216  0.273  1.0
  B  B5  1  0.104  0.761  0.333  1.0
  B  B6  1  0.896  0.239  0.667  1.0
  B  B7  1  0.323  0.784  0.727  1.0
  O  O8  1  0.716  0.680  0.002  1.0
  O  O9  1  0.842  0.335  0.294  1.0
  O  O10  1  0.227  0.934  0.321  1.0
  O  O11  1  0.216  0.610  0.253  1.0
  O  O12  1  0.694  0.064  0.173  1.0
  O  O13  1  0.486  0.282  0.370  1.0
  O  O14  1  0.895  0.742  0.418  1.0
  O  O15  1  0.105  0.258  0.582  1.0
  O  O16  1  0.514  0.718  0.630  1.0
  O  O17  1  0.306  0.936  0.827  1.0
  O  O18  1  0.784  0.390  0.747  1.0
  O  O19  1  0.773  0.066  0.679  1.0
  O  O20  1  0.158  0.665  0.706  1.0
  O  O21  1  0.284  0.320  0.998  1.0
[/CIF]
.