The material structure 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 to one O(1), one O(2), one O(3), and one O(6) atom to form BO4 tetrahedra that share corners with two equivalent Bi(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-58°. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms. In the second Bi site, Bi(2) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form BiO6 octahedra that share corners with two equivalent B(1)O4 tetrahedra and  an edgeedge with one Bi(2)O6 octahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one B(1) and two equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one B(1), one Bi(1), and one Bi(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one B(1), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one B(2) and one Bi(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one B(2), one Bi(1), and one Bi(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one B(1) and one B(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Bi(1) and two equivalent Bi(2) atoms. is represented by the CIF file [CIF]
data_Bi2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.758
_cell_length_b   6.483
_cell_length_c   8.315
_cell_angle_alpha   71.477
_cell_angle_beta   74.109
_cell_angle_gamma   71.962
_symmetry_Int_Tables_number   1
_cell_volume   274.486
_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  0.318  0.229  0.862  1.0
  Bi  Bi1  1  0.786  0.538  0.680  1.0
  Bi  Bi2  1  0.214  0.462  0.320  1.0
  Bi  Bi3  1  0.682  0.771  0.138  1.0
  B  B4  1  0.262  0.739  0.903  1.0
  B  B5  1  0.890  0.986  0.718  1.0
  B  B6  1  0.110  0.014  0.282  1.0
  B  B7  1  0.738  0.261  0.097  1.0
  O  O8  1  0.434  0.842  0.931  1.0
  O  O9  1  0.866  0.405  0.937  1.0
  O  O10  1  0.393  0.595  0.778  1.0
  O  O11  1  0.847  0.861  0.628  1.0
  O  O12  1  0.726  0.204  0.696  1.0
  O  O13  1  0.051  0.922  0.830  1.0
  O  O14  1  0.185  0.388  0.596  1.0
  O  O15  1  0.815  0.612  0.404  1.0
  O  O16  1  0.949  0.078  0.170  1.0
  O  O17  1  0.274  0.796  0.304  1.0
  O  O18  1  0.153  0.139  0.372  1.0
  O  O19  1  0.607  0.405  0.222  1.0
  O  O20  1  0.134  0.595  0.063  1.0
  O  O21  1  0.566  0.158  0.069  1.0
[/CIF]
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The material structure 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 to one O(1), one O(2), one O(3), and one O(6) atom to form BO4 tetrahedra that share corners with two equivalent Bi(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-58°. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms. In the second Bi site, Bi(2) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form BiO6 octahedra that share corners with two equivalent B(1)O4 tetrahedra and  an edgeedge with one Bi(2)O6 octahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one B(1) and two equivalent Bi(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one B(1), one Bi(1), and one Bi(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one B(1), one Bi(1), and one Bi(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one B(2) and one Bi(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one B(2), one Bi(1), and one Bi(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one B(1) and one B(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Bi(1) and two equivalent Bi(2) atoms. is represented by the CIF file [CIF]
data_Bi2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.758
_cell_length_b   6.483
_cell_length_c   8.315
_cell_angle_alpha   71.477
_cell_angle_beta   74.109
_cell_angle_gamma   71.962
_symmetry_Int_Tables_number   1
_cell_volume   274.486
_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  0.318  0.229  0.862  1.0
  Bi  Bi1  1  0.786  0.538  0.680  1.0
  Bi  Bi2  1  0.214  0.462  0.320  1.0
  Bi  Bi3  1  0.682  0.771  0.138  1.0
  B  B4  1  0.262  0.739  0.903  1.0
  B  B5  1  0.890  0.986  0.718  1.0
  B  B6  1  0.110  0.014  0.282  1.0
  B  B7  1  0.738  0.261  0.097  1.0
  O  O8  1  0.434  0.842  0.931  1.0
  O  O9  1  0.866  0.405  0.937  1.0
  O  O10  1  0.393  0.595  0.778  1.0
  O  O11  1  0.847  0.861  0.628  1.0
  O  O12  1  0.726  0.204  0.696  1.0
  O  O13  1  0.051  0.922  0.830  1.0
  O  O14  1  0.185  0.388  0.596  1.0
  O  O15  1  0.815  0.612  0.404  1.0
  O  O16  1  0.949  0.078  0.170  1.0
  O  O17  1  0.274  0.796  0.304  1.0
  O  O18  1  0.153  0.139  0.372  1.0
  O  O19  1  0.607  0.405  0.222  1.0
  O  O20  1  0.134  0.595  0.063  1.0
  O  O21  1  0.566  0.158  0.069  1.0
[/CIF]
.