The compound described by Na4P2O17 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(7), one O(8), and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), one O(8), and one O(9) atom. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one P(1) atom. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one Na(1) and one Na(2) atom. In the third O site, O(6) is bonded in an L-shaped geometry to two equivalent Na(1) atoms. In the fourth O site, O(7) is bonded in an L-shaped geometry to one Na(1) and one O(9) atom. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to one Na(1) and one Na(2) atom. In the sixth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one O(7) atom. In the seventh O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent P(1) atoms. In the eighth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(2) and one P(1) atom. In the ninth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one P(1) atom. is represented by the CIF card [CIF]
data_Na4P2O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.955
_cell_length_b   10.626
_cell_length_c   12.825
_cell_angle_alpha   73.643
_cell_angle_beta   76.576
_cell_angle_gamma   73.728
_symmetry_Int_Tables_number   1
_cell_volume   736.996
_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  0.584  0.832  0.541  1.0
  Na  Na1  1  0.042  0.332  0.041  1.0
  Na  Na2  1  0.416  0.168  0.459  1.0
  Na  Na3  1  0.958  0.668  0.959  1.0
  Na  Na4  1  0.436  0.045  0.832  1.0
  Na  Na5  1  0.687  0.545  0.332  1.0
  Na  Na6  1  0.564  0.955  0.168  1.0
  Na  Na7  1  0.313  0.455  0.668  1.0
  P  P8  1  0.170  0.800  0.354  1.0
  P  P9  1  0.676  0.300  0.854  1.0
  P  P10  1  0.830  0.200  0.646  1.0
  P  P11  1  0.324  0.700  0.146  1.0
  O  O12  1  0.137  0.750  0.250  1.0
  O  O13  1  0.863  0.250  0.750  1.0
  O  O14  1  0.396  0.703  0.396  1.0
  O  O15  1  0.506  0.203  0.896  1.0
  O  O16  1  0.604  0.297  0.604  1.0
  O  O17  1  0.494  0.797  0.104  1.0
  O  O18  1  0.947  0.782  0.438  1.0
  O  O19  1  0.833  0.282  0.938  1.0
  O  O20  1  0.053  0.218  0.562  1.0
  O  O21  1  0.167  0.718  0.062  1.0
  O  O22  1  0.203  0.945  0.304  1.0
  O  O23  1  0.548  0.445  0.804  1.0
  O  O24  1  0.797  0.055  0.696  1.0
  O  O25  1  0.452  0.555  0.196  1.0
  O  O26  1  0.364  0.671  0.573  1.0
  O  O27  1  0.392  0.171  0.073  1.0
  O  O28  1  0.636  0.329  0.427  1.0
  O  O29  1  0.608  0.829  0.927  1.0
  O  O30  1  0.786  0.005  0.540  1.0
  O  O31  1  0.669  0.505  0.040  1.0
  O  O32  1  0.214  0.995  0.460  1.0
  O  O33  1  0.331  0.495  0.960  1.0
  O  O34  1  0.205  0.809  0.783  1.0
  O  O35  1  0.203  0.309  0.283  1.0
  O  O36  1  0.795  0.191  0.217  1.0
  O  O37  1  0.797  0.691  0.717  1.0
  O  O38  1  0.366  0.091  0.649  1.0
  O  O39  1  0.894  0.591  0.149  1.0
  O  O40  1  0.634  0.909  0.351  1.0
  O  O41  1  0.106  0.409  0.851  1.0
  O  O42  1  0.162  0.896  0.837  1.0
  O  O43  1  0.106  0.396  0.337  1.0
  O  O44  1  0.838  0.104  0.163  1.0
  O  O45  1  0.894  0.604  0.663  1.0
[/CIF]
.
The compound described by Na4P2O17 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(7), one O(8), and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), one O(8), and one O(9) atom. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one P(1) atom. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one Na(1) and one Na(2) atom. In the third O site, O(6) is bonded in an L-shaped geometry to two equivalent Na(1) atoms. In the fourth O site, O(7) is bonded in an L-shaped geometry to one Na(1) and one O(9) atom. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to one Na(1) and one Na(2) atom. In the sixth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one O(7) atom. In the seventh O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent P(1) atoms. In the eighth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(2) and one P(1) atom. In the ninth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one P(1) atom. is represented by the CIF card [CIF]
data_Na4P2O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.955
_cell_length_b   10.626
_cell_length_c   12.825
_cell_angle_alpha   73.643
_cell_angle_beta   76.576
_cell_angle_gamma   73.728
_symmetry_Int_Tables_number   1
_cell_volume   736.996
_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  0.584  0.832  0.541  1.0
  Na  Na1  1  0.042  0.332  0.041  1.0
  Na  Na2  1  0.416  0.168  0.459  1.0
  Na  Na3  1  0.958  0.668  0.959  1.0
  Na  Na4  1  0.436  0.045  0.832  1.0
  Na  Na5  1  0.687  0.545  0.332  1.0
  Na  Na6  1  0.564  0.955  0.168  1.0
  Na  Na7  1  0.313  0.455  0.668  1.0
  P  P8  1  0.170  0.800  0.354  1.0
  P  P9  1  0.676  0.300  0.854  1.0
  P  P10  1  0.830  0.200  0.646  1.0
  P  P11  1  0.324  0.700  0.146  1.0
  O  O12  1  0.137  0.750  0.250  1.0
  O  O13  1  0.863  0.250  0.750  1.0
  O  O14  1  0.396  0.703  0.396  1.0
  O  O15  1  0.506  0.203  0.896  1.0
  O  O16  1  0.604  0.297  0.604  1.0
  O  O17  1  0.494  0.797  0.104  1.0
  O  O18  1  0.947  0.782  0.438  1.0
  O  O19  1  0.833  0.282  0.938  1.0
  O  O20  1  0.053  0.218  0.562  1.0
  O  O21  1  0.167  0.718  0.062  1.0
  O  O22  1  0.203  0.945  0.304  1.0
  O  O23  1  0.548  0.445  0.804  1.0
  O  O24  1  0.797  0.055  0.696  1.0
  O  O25  1  0.452  0.555  0.196  1.0
  O  O26  1  0.364  0.671  0.573  1.0
  O  O27  1  0.392  0.171  0.073  1.0
  O  O28  1  0.636  0.329  0.427  1.0
  O  O29  1  0.608  0.829  0.927  1.0
  O  O30  1  0.786  0.005  0.540  1.0
  O  O31  1  0.669  0.505  0.040  1.0
  O  O32  1  0.214  0.995  0.460  1.0
  O  O33  1  0.331  0.495  0.960  1.0
  O  O34  1  0.205  0.809  0.783  1.0
  O  O35  1  0.203  0.309  0.283  1.0
  O  O36  1  0.795  0.191  0.217  1.0
  O  O37  1  0.797  0.691  0.717  1.0
  O  O38  1  0.366  0.091  0.649  1.0
  O  O39  1  0.894  0.591  0.149  1.0
  O  O40  1  0.634  0.909  0.351  1.0
  O  O41  1  0.106  0.409  0.851  1.0
  O  O42  1  0.162  0.896  0.837  1.0
  O  O43  1  0.106  0.396  0.337  1.0
  O  O44  1  0.838  0.104  0.163  1.0
  O  O45  1  0.894  0.604  0.663  1.0
[/CIF]
.