The crystal structure described by In2P2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 1-coordinate geometry to one O(7) atom. In the second In site, In(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form InO6 octahedra 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(2), one O(3), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent In(2)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-54°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent In(2)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 21-50°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one In(2) and one P(2) atom. In the second O site, O(6) is bonded in a distorted bent 120 degrees geometry to one In(2) and one P(1) atom. In the third O site, O(7) is bonded in a 2-coordinate geometry to one In(1), one In(2), and one P(2) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one In(2) and one P(1) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one In(2) and one P(1) atom. In the sixth O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a 2-coordinate geometry to one In(2) and one P(2) atom. is represented by the CIF file [CIF]
data_In2P2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.494
_cell_length_b   7.533
_cell_length_c   8.483
_cell_angle_alpha   73.862
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   644.171
_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
  In  In0  1  0.680  0.331  0.063  1.0
  In  In1  1  0.180  0.669  0.437  1.0
  In  In2  1  0.320  0.669  0.937  1.0
  In  In3  1  0.820  0.331  0.563  1.0
  In  In4  1  0.599  0.738  0.241  1.0
  In  In5  1  0.099  0.262  0.259  1.0
  In  In6  1  0.401  0.262  0.759  1.0
  In  In7  1  0.901  0.738  0.741  1.0
  P  P8  1  0.637  0.938  0.809  1.0
  P  P9  1  0.137  0.062  0.691  1.0
  P  P10  1  0.363  0.062  0.191  1.0
  P  P11  1  0.863  0.938  0.309  1.0
  P  P12  1  0.598  0.631  0.674  1.0
  P  P13  1  0.098  0.369  0.826  1.0
  P  P14  1  0.402  0.369  0.326  1.0
  P  P15  1  0.902  0.631  0.174  1.0
  O  O16  1  0.606  0.817  0.978  1.0
  O  O17  1  0.106  0.183  0.522  1.0
  O  O18  1  0.394  0.183  0.022  1.0
  O  O19  1  0.894  0.817  0.478  1.0
  O  O20  1  0.579  0.129  0.767  1.0
  O  O21  1  0.079  0.871  0.733  1.0
  O  O22  1  0.421  0.871  0.233  1.0
  O  O23  1  0.921  0.129  0.267  1.0
  O  O24  1  0.571  0.837  0.684  1.0
  O  O25  1  0.071  0.163  0.816  1.0
  O  O26  1  0.429  0.163  0.316  1.0
  O  O27  1  0.929  0.837  0.184  1.0
  O  O28  1  0.729  0.573  0.749  1.0
  O  O29  1  0.229  0.427  0.751  1.0
  O  O30  1  0.271  0.427  0.251  1.0
  O  O31  1  0.771  0.573  0.249  1.0
  O  O32  1  0.908  0.634  0.998  1.0
  O  O33  1  0.408  0.366  0.502  1.0
  O  O34  1  0.092  0.366  0.002  1.0
  O  O35  1  0.592  0.634  0.498  1.0
  O  O36  1  0.778  0.955  0.768  1.0
  O  O37  1  0.278  0.045  0.732  1.0
  O  O38  1  0.222  0.045  0.232  1.0
  O  O39  1  0.722  0.955  0.268  1.0
  O  O40  1  0.996  0.489  0.720  1.0
  O  O41  1  0.496  0.511  0.780  1.0
  O  O42  1  0.004  0.511  0.280  1.0
  O  O43  1  0.504  0.489  0.220  1.0
[/CIF]
.
The crystal structure described by In2P2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 1-coordinate geometry to one O(7) atom. In the second In site, In(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form InO6 octahedra 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(2), one O(3), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent In(2)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-54°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent In(2)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 21-50°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one In(2) and one P(2) atom. In the second O site, O(6) is bonded in a distorted bent 120 degrees geometry to one In(2) and one P(1) atom. In the third O site, O(7) is bonded in a 2-coordinate geometry to one In(1), one In(2), and one P(2) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one In(2) and one P(1) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one In(2) and one P(1) atom. In the sixth O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a 2-coordinate geometry to one In(2) and one P(2) atom. is represented by the CIF file [CIF]
data_In2P2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.494
_cell_length_b   7.533
_cell_length_c   8.483
_cell_angle_alpha   73.862
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   644.171
_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
  In  In0  1  0.680  0.331  0.063  1.0
  In  In1  1  0.180  0.669  0.437  1.0
  In  In2  1  0.320  0.669  0.937  1.0
  In  In3  1  0.820  0.331  0.563  1.0
  In  In4  1  0.599  0.738  0.241  1.0
  In  In5  1  0.099  0.262  0.259  1.0
  In  In6  1  0.401  0.262  0.759  1.0
  In  In7  1  0.901  0.738  0.741  1.0
  P  P8  1  0.637  0.938  0.809  1.0
  P  P9  1  0.137  0.062  0.691  1.0
  P  P10  1  0.363  0.062  0.191  1.0
  P  P11  1  0.863  0.938  0.309  1.0
  P  P12  1  0.598  0.631  0.674  1.0
  P  P13  1  0.098  0.369  0.826  1.0
  P  P14  1  0.402  0.369  0.326  1.0
  P  P15  1  0.902  0.631  0.174  1.0
  O  O16  1  0.606  0.817  0.978  1.0
  O  O17  1  0.106  0.183  0.522  1.0
  O  O18  1  0.394  0.183  0.022  1.0
  O  O19  1  0.894  0.817  0.478  1.0
  O  O20  1  0.579  0.129  0.767  1.0
  O  O21  1  0.079  0.871  0.733  1.0
  O  O22  1  0.421  0.871  0.233  1.0
  O  O23  1  0.921  0.129  0.267  1.0
  O  O24  1  0.571  0.837  0.684  1.0
  O  O25  1  0.071  0.163  0.816  1.0
  O  O26  1  0.429  0.163  0.316  1.0
  O  O27  1  0.929  0.837  0.184  1.0
  O  O28  1  0.729  0.573  0.749  1.0
  O  O29  1  0.229  0.427  0.751  1.0
  O  O30  1  0.271  0.427  0.251  1.0
  O  O31  1  0.771  0.573  0.249  1.0
  O  O32  1  0.908  0.634  0.998  1.0
  O  O33  1  0.408  0.366  0.502  1.0
  O  O34  1  0.092  0.366  0.002  1.0
  O  O35  1  0.592  0.634  0.498  1.0
  O  O36  1  0.778  0.955  0.768  1.0
  O  O37  1  0.278  0.045  0.732  1.0
  O  O38  1  0.222  0.045  0.232  1.0
  O  O39  1  0.722  0.955  0.268  1.0
  O  O40  1  0.996  0.489  0.720  1.0
  O  O41  1  0.496  0.511  0.780  1.0
  O  O42  1  0.004  0.511  0.280  1.0
  O  O43  1  0.504  0.489  0.220  1.0
[/CIF]
.