The compound described by FeP2O7 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(6) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Fe(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Fe(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF card [CIF]
data_FeP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.067
_cell_length_b   8.360
_cell_length_c   9.320
_cell_angle_alpha   90.000
_cell_angle_beta   112.204
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   509.797
_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
  Fe  Fe0  1  0.872  0.419  0.137  1.0
  Fe  Fe1  1  0.372  0.081  0.637  1.0
  Fe  Fe2  1  0.128  0.581  0.863  1.0
  Fe  Fe3  1  0.628  0.919  0.363  1.0
  P  P4  1  0.570  0.756  0.035  1.0
  P  P5  1  0.430  0.244  0.965  1.0
  P  P6  1  0.930  0.256  0.465  1.0
  P  P7  1  0.678  0.778  0.754  1.0
  P  P8  1  0.070  0.744  0.535  1.0
  P  P9  1  0.178  0.722  0.254  1.0
  P  P10  1  0.322  0.222  0.246  1.0
  P  P11  1  0.822  0.278  0.746  1.0
  O  O12  1  0.401  0.083  0.362  1.0
  O  O13  1  0.636  0.887  0.158  1.0
  O  O14  1  0.839  0.766  0.471  1.0
  O  O15  1  0.689  0.601  0.086  1.0
  O  O16  1  0.364  0.113  0.842  1.0
  O  O17  1  0.901  0.417  0.862  1.0
  O  O18  1  0.599  0.917  0.638  1.0
  O  O19  1  0.864  0.387  0.342  1.0
  O  O20  1  0.161  0.234  0.529  1.0
  O  O21  1  0.070  0.880  0.185  1.0
  O  O22  1  0.908  0.748  0.812  1.0
  O  O23  1  0.811  0.101  0.414  1.0
  O  O24  1  0.592  0.248  0.688  1.0
  O  O25  1  0.374  0.165  0.102  1.0
  O  O26  1  0.136  0.613  0.658  1.0
  O  O27  1  0.126  0.665  0.398  1.0
  O  O28  1  0.339  0.734  0.971  1.0
  O  O29  1  0.099  0.583  0.138  1.0
  O  O30  1  0.311  0.399  0.914  1.0
  O  O31  1  0.430  0.380  0.315  1.0
  O  O32  1  0.930  0.120  0.815  1.0
  O  O33  1  0.408  0.752  0.312  1.0
  O  O34  1  0.874  0.335  0.602  1.0
  O  O35  1  0.092  0.252  0.188  1.0
  O  O36  1  0.661  0.266  0.029  1.0
  O  O37  1  0.189  0.899  0.586  1.0
  O  O38  1  0.626  0.835  0.898  1.0
  O  O39  1  0.570  0.620  0.685  1.0
[/CIF]
.
The compound described by FeP2O7 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(6) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Fe(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Fe(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF card [CIF]
data_FeP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.067
_cell_length_b   8.360
_cell_length_c   9.320
_cell_angle_alpha   90.000
_cell_angle_beta   112.204
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   509.797
_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
  Fe  Fe0  1  0.872  0.419  0.137  1.0
  Fe  Fe1  1  0.372  0.081  0.637  1.0
  Fe  Fe2  1  0.128  0.581  0.863  1.0
  Fe  Fe3  1  0.628  0.919  0.363  1.0
  P  P4  1  0.570  0.756  0.035  1.0
  P  P5  1  0.430  0.244  0.965  1.0
  P  P6  1  0.930  0.256  0.465  1.0
  P  P7  1  0.678  0.778  0.754  1.0
  P  P8  1  0.070  0.744  0.535  1.0
  P  P9  1  0.178  0.722  0.254  1.0
  P  P10  1  0.322  0.222  0.246  1.0
  P  P11  1  0.822  0.278  0.746  1.0
  O  O12  1  0.401  0.083  0.362  1.0
  O  O13  1  0.636  0.887  0.158  1.0
  O  O14  1  0.839  0.766  0.471  1.0
  O  O15  1  0.689  0.601  0.086  1.0
  O  O16  1  0.364  0.113  0.842  1.0
  O  O17  1  0.901  0.417  0.862  1.0
  O  O18  1  0.599  0.917  0.638  1.0
  O  O19  1  0.864  0.387  0.342  1.0
  O  O20  1  0.161  0.234  0.529  1.0
  O  O21  1  0.070  0.880  0.185  1.0
  O  O22  1  0.908  0.748  0.812  1.0
  O  O23  1  0.811  0.101  0.414  1.0
  O  O24  1  0.592  0.248  0.688  1.0
  O  O25  1  0.374  0.165  0.102  1.0
  O  O26  1  0.136  0.613  0.658  1.0
  O  O27  1  0.126  0.665  0.398  1.0
  O  O28  1  0.339  0.734  0.971  1.0
  O  O29  1  0.099  0.583  0.138  1.0
  O  O30  1  0.311  0.399  0.914  1.0
  O  O31  1  0.430  0.380  0.315  1.0
  O  O32  1  0.930  0.120  0.815  1.0
  O  O33  1  0.408  0.752  0.312  1.0
  O  O34  1  0.874  0.335  0.602  1.0
  O  O35  1  0.092  0.252  0.188  1.0
  O  O36  1  0.661  0.266  0.029  1.0
  O  O37  1  0.189  0.899  0.586  1.0
  O  O38  1  0.626  0.835  0.898  1.0
  O  O39  1  0.570  0.620  0.685  1.0
[/CIF]
.