The crystal structure described by Na3Bi(P2O7)2 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(4), one O(6), one O(8), and one O(9) atom to form NaO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(5), one O(8), one O(9), and two equivalent O(13) atoms. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(6), one O(9), and two equivalent O(14) atoms. Bi(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(3), one O(4), and one O(5) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid and  a cornercorner with one P(3)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(10), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Na(1)O5 square pyramids and  a cornercorner with one P(4)O4 tetrahedra. In the third P site, P(3) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid and  a cornercorner with one P(1)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid and  a cornercorner with one P(2)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one P(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Na(1), one Bi(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Bi(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Bi(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Na(2), one Bi(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(3), and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one P(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(2) and one P(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(3), one Bi(1), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Na(3), one Bi(1), and one P(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to two equivalent Na(3) and one P(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Bi(P2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.407
_cell_length_b   9.653
_cell_length_c   9.714
_cell_angle_alpha   80.677
_cell_angle_beta   77.325
_cell_angle_gamma   69.813
_symmetry_Int_Tables_number   1
_cell_volume   633.182
_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
  Na  Na0  1  0.355  0.149  0.274  1.0
  Na  Na1  1  0.052  0.501  0.162  1.0
  Na  Na2  1  0.443  0.459  0.332  1.0
  Na  Na3  1  0.557  0.541  0.668  1.0
  Na  Na4  1  0.948  0.499  0.838  1.0
  Na  Na5  1  0.645  0.851  0.726  1.0
  Bi  Bi6  1  0.880  0.122  0.781  1.0
  Bi  Bi7  1  0.120  0.878  0.219  1.0
  P  P8  1  0.185  0.135  0.975  1.0
  P  P9  1  0.729  0.108  0.451  1.0
  P  P10  1  0.414  0.334  0.945  1.0
  P  P11  1  0.902  0.342  0.453  1.0
  P  P12  1  0.098  0.658  0.547  1.0
  P  P13  1  0.586  0.666  0.055  1.0
  P  P14  1  0.271  0.892  0.549  1.0
  P  P15  1  0.815  0.865  0.025  1.0
  O  O16  1  0.179  0.035  0.624  1.0
  O  O17  1  0.122  0.163  0.131  1.0
  O  O18  1  0.769  0.028  0.044  1.0
  O  O19  1  0.692  0.078  0.614  1.0
  O  O20  1  0.037  0.237  0.879  1.0
  O  O21  1  0.544  0.209  0.397  1.0
  O  O22  1  0.383  0.181  0.915  1.0
  O  O23  1  0.095  0.357  0.373  1.0
  O  O24  1  0.410  0.334  0.103  1.0
  O  O25  1  0.896  0.187  0.411  1.0
  O  O26  1  0.608  0.330  0.847  1.0
  O  O27  1  0.883  0.325  0.616  1.0
  O  O28  1  0.242  0.467  0.904  1.0
  O  O29  1  0.278  0.533  0.586  1.0
  O  O30  1  0.722  0.467  0.414  1.0
  O  O31  1  0.758  0.533  0.096  1.0
  O  O32  1  0.117  0.675  0.384  1.0
  O  O33  1  0.392  0.670  0.153  1.0
  O  O34  1  0.104  0.813  0.589  1.0
  O  O35  1  0.590  0.666  0.897  1.0
  O  O36  1  0.905  0.643  0.627  1.0
  O  O37  1  0.617  0.819  0.085  1.0
  O  O38  1  0.456  0.791  0.603  1.0
  O  O39  1  0.963  0.763  0.121  1.0
  O  O40  1  0.308  0.922  0.386  1.0
  O  O41  1  0.231  0.972  0.956  1.0
  O  O42  1  0.878  0.837  0.869  1.0
  O  O43  1  0.821  0.965  0.376  1.0
[/CIF]
.
The crystal structure described by Na3Bi(P2O7)2 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(4), one O(6), one O(8), and one O(9) atom to form NaO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(5), one O(8), one O(9), and two equivalent O(13) atoms. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(6), one O(9), and two equivalent O(14) atoms. Bi(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(3), one O(4), and one O(5) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid and  a cornercorner with one P(3)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(10), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Na(1)O5 square pyramids and  a cornercorner with one P(4)O4 tetrahedra. In the third P site, P(3) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid and  a cornercorner with one P(1)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Na(1)O5 square pyramid and  a cornercorner with one P(2)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one P(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Na(1), one Bi(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Bi(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Bi(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Na(2), one Bi(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(3), and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one P(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(2) and one P(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(3), one Bi(1), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Na(3), one Bi(1), and one P(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to two equivalent Na(3) and one P(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Bi(P2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.407
_cell_length_b   9.653
_cell_length_c   9.714
_cell_angle_alpha   80.677
_cell_angle_beta   77.325
_cell_angle_gamma   69.813
_symmetry_Int_Tables_number   1
_cell_volume   633.182
_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
  Na  Na0  1  0.355  0.149  0.274  1.0
  Na  Na1  1  0.052  0.501  0.162  1.0
  Na  Na2  1  0.443  0.459  0.332  1.0
  Na  Na3  1  0.557  0.541  0.668  1.0
  Na  Na4  1  0.948  0.499  0.838  1.0
  Na  Na5  1  0.645  0.851  0.726  1.0
  Bi  Bi6  1  0.880  0.122  0.781  1.0
  Bi  Bi7  1  0.120  0.878  0.219  1.0
  P  P8  1  0.185  0.135  0.975  1.0
  P  P9  1  0.729  0.108  0.451  1.0
  P  P10  1  0.414  0.334  0.945  1.0
  P  P11  1  0.902  0.342  0.453  1.0
  P  P12  1  0.098  0.658  0.547  1.0
  P  P13  1  0.586  0.666  0.055  1.0
  P  P14  1  0.271  0.892  0.549  1.0
  P  P15  1  0.815  0.865  0.025  1.0
  O  O16  1  0.179  0.035  0.624  1.0
  O  O17  1  0.122  0.163  0.131  1.0
  O  O18  1  0.769  0.028  0.044  1.0
  O  O19  1  0.692  0.078  0.614  1.0
  O  O20  1  0.037  0.237  0.879  1.0
  O  O21  1  0.544  0.209  0.397  1.0
  O  O22  1  0.383  0.181  0.915  1.0
  O  O23  1  0.095  0.357  0.373  1.0
  O  O24  1  0.410  0.334  0.103  1.0
  O  O25  1  0.896  0.187  0.411  1.0
  O  O26  1  0.608  0.330  0.847  1.0
  O  O27  1  0.883  0.325  0.616  1.0
  O  O28  1  0.242  0.467  0.904  1.0
  O  O29  1  0.278  0.533  0.586  1.0
  O  O30  1  0.722  0.467  0.414  1.0
  O  O31  1  0.758  0.533  0.096  1.0
  O  O32  1  0.117  0.675  0.384  1.0
  O  O33  1  0.392  0.670  0.153  1.0
  O  O34  1  0.104  0.813  0.589  1.0
  O  O35  1  0.590  0.666  0.897  1.0
  O  O36  1  0.905  0.643  0.627  1.0
  O  O37  1  0.617  0.819  0.085  1.0
  O  O38  1  0.456  0.791  0.603  1.0
  O  O39  1  0.963  0.763  0.121  1.0
  O  O40  1  0.308  0.922  0.386  1.0
  O  O41  1  0.231  0.972  0.956  1.0
  O  O42  1  0.878  0.837  0.869  1.0
  O  O43  1  0.821  0.965  0.376  1.0
[/CIF]
.