The compound described by Sr2P2O7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(5), and four equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and four equivalent O(5) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(4), and two equivalent O(5) atoms to form corner-sharing PO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Sr(2), and one P(2) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), two equivalent Sr(2), and one P(2) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. is represented by the CIF card [CIF]
data_Sr2P2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.396
_cell_length_b   8.917
_cell_length_c   13.178
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   634.086
_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
  Sr  Sr0  1  0.250  0.125  0.587  1.0
  Sr  Sr1  1  0.750  0.875  0.413  1.0
  Sr  Sr2  1  0.250  0.625  0.913  1.0
  Sr  Sr3  1  0.750  0.375  0.087  1.0
  Sr  Sr4  1  0.250  0.172  0.260  1.0
  Sr  Sr5  1  0.750  0.828  0.740  1.0
  Sr  Sr6  1  0.250  0.672  0.240  1.0
  Sr  Sr7  1  0.750  0.328  0.760  1.0
  P  P8  1  0.750  0.723  0.036  1.0
  P  P9  1  0.250  0.277  0.964  1.0
  P  P10  1  0.750  0.223  0.464  1.0
  P  P11  1  0.250  0.777  0.536  1.0
  P  P12  1  0.750  0.967  0.183  1.0
  P  P13  1  0.250  0.033  0.817  1.0
  P  P14  1  0.750  0.467  0.317  1.0
  P  P15  1  0.250  0.533  0.683  1.0
  O  O16  1  0.750  0.134  0.167  1.0
  O  O17  1  0.250  0.866  0.833  1.0
  O  O18  1  0.750  0.634  0.333  1.0
  O  O19  1  0.250  0.366  0.667  1.0
  O  O20  1  0.750  0.726  0.921  1.0
  O  O21  1  0.250  0.274  0.079  1.0
  O  O22  1  0.750  0.226  0.579  1.0
  O  O23  1  0.250  0.774  0.421  1.0
  O  O24  1  0.481  0.354  0.923  1.0
  O  O25  1  0.981  0.646  0.077  1.0
  O  O26  1  0.019  0.854  0.577  1.0
  O  O27  1  0.519  0.146  0.423  1.0
  O  O28  1  0.519  0.646  0.077  1.0
  O  O29  1  0.019  0.354  0.923  1.0
  O  O30  1  0.981  0.146  0.423  1.0
  O  O31  1  0.481  0.854  0.577  1.0
  O  O32  1  0.250  0.605  0.571  1.0
  O  O33  1  0.750  0.395  0.429  1.0
  O  O34  1  0.250  0.105  0.929  1.0
  O  O35  1  0.750  0.895  0.071  1.0
  O  O36  1  0.483  0.584  0.738  1.0
  O  O37  1  0.983  0.416  0.262  1.0
  O  O38  1  0.017  0.084  0.762  1.0
  O  O39  1  0.517  0.916  0.238  1.0
  O  O40  1  0.517  0.416  0.262  1.0
  O  O41  1  0.017  0.584  0.738  1.0
  O  O42  1  0.983  0.916  0.238  1.0
  O  O43  1  0.483  0.084  0.762  1.0
[/CIF]
.
The compound described by Sr2P2O7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(5), and four equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and four equivalent O(5) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(4), and two equivalent O(5) atoms to form corner-sharing PO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Sr(2), and one P(2) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), two equivalent Sr(2), and one P(2) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. is represented by the CIF card [CIF]
data_Sr2P2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.396
_cell_length_b   8.917
_cell_length_c   13.178
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   634.086
_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
  Sr  Sr0  1  0.250  0.125  0.587  1.0
  Sr  Sr1  1  0.750  0.875  0.413  1.0
  Sr  Sr2  1  0.250  0.625  0.913  1.0
  Sr  Sr3  1  0.750  0.375  0.087  1.0
  Sr  Sr4  1  0.250  0.172  0.260  1.0
  Sr  Sr5  1  0.750  0.828  0.740  1.0
  Sr  Sr6  1  0.250  0.672  0.240  1.0
  Sr  Sr7  1  0.750  0.328  0.760  1.0
  P  P8  1  0.750  0.723  0.036  1.0
  P  P9  1  0.250  0.277  0.964  1.0
  P  P10  1  0.750  0.223  0.464  1.0
  P  P11  1  0.250  0.777  0.536  1.0
  P  P12  1  0.750  0.967  0.183  1.0
  P  P13  1  0.250  0.033  0.817  1.0
  P  P14  1  0.750  0.467  0.317  1.0
  P  P15  1  0.250  0.533  0.683  1.0
  O  O16  1  0.750  0.134  0.167  1.0
  O  O17  1  0.250  0.866  0.833  1.0
  O  O18  1  0.750  0.634  0.333  1.0
  O  O19  1  0.250  0.366  0.667  1.0
  O  O20  1  0.750  0.726  0.921  1.0
  O  O21  1  0.250  0.274  0.079  1.0
  O  O22  1  0.750  0.226  0.579  1.0
  O  O23  1  0.250  0.774  0.421  1.0
  O  O24  1  0.481  0.354  0.923  1.0
  O  O25  1  0.981  0.646  0.077  1.0
  O  O26  1  0.019  0.854  0.577  1.0
  O  O27  1  0.519  0.146  0.423  1.0
  O  O28  1  0.519  0.646  0.077  1.0
  O  O29  1  0.019  0.354  0.923  1.0
  O  O30  1  0.981  0.146  0.423  1.0
  O  O31  1  0.481  0.854  0.577  1.0
  O  O32  1  0.250  0.605  0.571  1.0
  O  O33  1  0.750  0.395  0.429  1.0
  O  O34  1  0.250  0.105  0.929  1.0
  O  O35  1  0.750  0.895  0.071  1.0
  O  O36  1  0.483  0.584  0.738  1.0
  O  O37  1  0.983  0.416  0.262  1.0
  O  O38  1  0.017  0.084  0.762  1.0
  O  O39  1  0.517  0.916  0.238  1.0
  O  O40  1  0.517  0.416  0.262  1.0
  O  O41  1  0.017  0.584  0.738  1.0
  O  O42  1  0.983  0.916  0.238  1.0
  O  O43  1  0.483  0.084  0.762  1.0
[/CIF]
.