The crystal structure described by BiP2O7 crystallizes in the monoclinic P2_1/c space group. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form distorted BiO6 pentagonal pyramids that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Bi(1)O6 pentagonal pyramids and  a cornercorner with one P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Bi(1)O6 pentagonal pyramids and  a cornercorner with one P(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Bi(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Bi(1) and one P(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Bi(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Bi(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_BiP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.672
_cell_length_b   5.240
_cell_length_c   13.428
_cell_angle_alpha   67.624
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   564.232
_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  0.700  0.581  0.228  1.0
  Bi  Bi1  1  0.800  0.581  0.728  1.0
  Bi  Bi2  1  0.200  0.419  0.272  1.0
  Bi  Bi3  1  0.300  0.419  0.772  1.0
  P  P4  1  0.462  0.895  0.335  1.0
  P  P5  1  0.287  0.706  0.979  1.0
  P  P6  1  0.713  0.294  0.021  1.0
  P  P7  1  0.213  0.706  0.479  1.0
  P  P8  1  0.962  0.105  0.165  1.0
  P  P9  1  0.038  0.895  0.835  1.0
  P  P10  1  0.787  0.294  0.521  1.0
  P  P11  1  0.538  0.105  0.665  1.0
  O  O12  1  0.125  0.757  0.771  1.0
  O  O13  1  0.875  0.243  0.229  1.0
  O  O14  1  0.312  0.647  0.098  1.0
  O  O15  1  0.373  0.964  0.904  1.0
  O  O16  1  0.169  0.461  0.449  1.0
  O  O17  1  0.066  0.212  0.795  1.0
  O  O18  1  0.397  0.768  0.458  1.0
  O  O19  1  0.127  0.964  0.404  1.0
  O  O20  1  0.934  0.788  0.205  1.0
  O  O21  1  0.366  0.165  0.662  1.0
  O  O22  1  0.603  0.232  0.542  1.0
  O  O23  1  0.103  0.768  0.958  1.0
  O  O24  1  0.134  0.165  0.162  1.0
  O  O25  1  0.873  0.036  0.596  1.0
  O  O26  1  0.897  0.232  0.042  1.0
  O  O27  1  0.331  0.461  0.949  1.0
  O  O28  1  0.669  0.539  0.051  1.0
  O  O29  1  0.627  0.036  0.096  1.0
  O  O30  1  0.434  0.212  0.295  1.0
  O  O31  1  0.634  0.835  0.338  1.0
  O  O32  1  0.831  0.539  0.551  1.0
  O  O33  1  0.812  0.353  0.402  1.0
  O  O34  1  0.188  0.647  0.598  1.0
  O  O35  1  0.866  0.835  0.838  1.0
  O  O36  1  0.688  0.353  0.902  1.0
  O  O37  1  0.375  0.757  0.271  1.0
  O  O38  1  0.566  0.788  0.705  1.0
  O  O39  1  0.625  0.243  0.729  1.0
[/CIF]
.
The crystal structure described by BiP2O7 crystallizes in the monoclinic P2_1/c space group. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form distorted BiO6 pentagonal pyramids that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Bi(1)O6 pentagonal pyramids and  a cornercorner with one P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Bi(1)O6 pentagonal pyramids and  a cornercorner with one P(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Bi(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Bi(1) and one P(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Bi(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Bi(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_BiP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.672
_cell_length_b   5.240
_cell_length_c   13.428
_cell_angle_alpha   67.624
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   564.232
_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  0.700  0.581  0.228  1.0
  Bi  Bi1  1  0.800  0.581  0.728  1.0
  Bi  Bi2  1  0.200  0.419  0.272  1.0
  Bi  Bi3  1  0.300  0.419  0.772  1.0
  P  P4  1  0.462  0.895  0.335  1.0
  P  P5  1  0.287  0.706  0.979  1.0
  P  P6  1  0.713  0.294  0.021  1.0
  P  P7  1  0.213  0.706  0.479  1.0
  P  P8  1  0.962  0.105  0.165  1.0
  P  P9  1  0.038  0.895  0.835  1.0
  P  P10  1  0.787  0.294  0.521  1.0
  P  P11  1  0.538  0.105  0.665  1.0
  O  O12  1  0.125  0.757  0.771  1.0
  O  O13  1  0.875  0.243  0.229  1.0
  O  O14  1  0.312  0.647  0.098  1.0
  O  O15  1  0.373  0.964  0.904  1.0
  O  O16  1  0.169  0.461  0.449  1.0
  O  O17  1  0.066  0.212  0.795  1.0
  O  O18  1  0.397  0.768  0.458  1.0
  O  O19  1  0.127  0.964  0.404  1.0
  O  O20  1  0.934  0.788  0.205  1.0
  O  O21  1  0.366  0.165  0.662  1.0
  O  O22  1  0.603  0.232  0.542  1.0
  O  O23  1  0.103  0.768  0.958  1.0
  O  O24  1  0.134  0.165  0.162  1.0
  O  O25  1  0.873  0.036  0.596  1.0
  O  O26  1  0.897  0.232  0.042  1.0
  O  O27  1  0.331  0.461  0.949  1.0
  O  O28  1  0.669  0.539  0.051  1.0
  O  O29  1  0.627  0.036  0.096  1.0
  O  O30  1  0.434  0.212  0.295  1.0
  O  O31  1  0.634  0.835  0.338  1.0
  O  O32  1  0.831  0.539  0.551  1.0
  O  O33  1  0.812  0.353  0.402  1.0
  O  O34  1  0.188  0.647  0.598  1.0
  O  O35  1  0.866  0.835  0.838  1.0
  O  O36  1  0.688  0.353  0.902  1.0
  O  O37  1  0.375  0.757  0.271  1.0
  O  O38  1  0.566  0.788  0.705  1.0
  O  O39  1  0.625  0.243  0.729  1.0
[/CIF]
.