The compound described by FePbP2O7 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form distorted FeO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Pb(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(6), one O(7), and two equivalent O(1) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Fe(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1), one Pb(1), and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Fe(1), one Pb(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Fe(1), one Pb(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Fe(1), one Pb(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Fe(1), one Pb(1), and one P(2) atom. is represented by the CIF card [CIF]
data_FeP2PbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.448
_cell_length_b   5.463
_cell_length_c   14.056
_cell_angle_alpha   67.848
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   600.765
_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  0.350  0.926  0.894  1.0
  Fe  Fe1  1  0.850  0.074  0.606  1.0
  Fe  Fe2  1  0.650  0.074  0.106  1.0
  Fe  Fe3  1  0.150  0.926  0.394  1.0
  P  P4  1  0.539  0.915  0.336  1.0
  P  P5  1  0.300  0.296  0.018  1.0
  P  P6  1  0.200  0.296  0.518  1.0
  P  P7  1  0.461  0.085  0.664  1.0
  P  P8  1  0.961  0.915  0.836  1.0
  P  P9  1  0.700  0.704  0.982  1.0
  P  P10  1  0.039  0.085  0.164  1.0
  P  P11  1  0.800  0.704  0.482  1.0
  Pb  Pb12  1  0.675  0.434  0.778  1.0
  Pb  Pb13  1  0.825  0.434  0.278  1.0
  Pb  Pb14  1  0.325  0.566  0.222  1.0
  Pb  Pb15  1  0.175  0.566  0.722  1.0
  O  O16  1  0.563  0.214  0.298  1.0
  O  O17  1  0.596  0.921  0.904  1.0
  O  O18  1  0.121  0.206  0.234  1.0
  O  O19  1  0.096  0.079  0.596  1.0
  O  O20  1  0.865  0.166  0.151  1.0
  O  O21  1  0.063  0.786  0.202  1.0
  O  O22  1  0.635  0.166  0.651  1.0
  O  O23  1  0.621  0.794  0.266  1.0
  O  O24  1  0.904  0.921  0.404  1.0
  O  O25  1  0.365  0.834  0.349  1.0
  O  O26  1  0.117  0.216  0.051  1.0
  O  O27  1  0.671  0.433  0.975  1.0
  O  O28  1  0.188  0.295  0.409  1.0
  O  O29  1  0.617  0.784  0.449  1.0
  O  O30  1  0.437  0.786  0.702  1.0
  O  O31  1  0.879  0.794  0.766  1.0
  O  O32  1  0.812  0.705  0.591  1.0
  O  O33  1  0.379  0.206  0.734  1.0
  O  O34  1  0.829  0.433  0.475  1.0
  O  O35  1  0.171  0.567  0.525  1.0
  O  O36  1  0.937  0.214  0.798  1.0
  O  O37  1  0.883  0.784  0.949  1.0
  O  O38  1  0.404  0.079  0.096  1.0
  O  O39  1  0.329  0.567  0.025  1.0
  O  O40  1  0.688  0.705  0.091  1.0
  O  O41  1  0.312  0.295  0.909  1.0
  O  O42  1  0.383  0.216  0.551  1.0
  O  O43  1  0.135  0.834  0.849  1.0
[/CIF]
.
The compound described by FePbP2O7 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form distorted FeO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Pb(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(6), one O(7), and two equivalent O(1) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Fe(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1), one Pb(1), and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Fe(1), one Pb(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Fe(1), one Pb(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Fe(1), one Pb(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Fe(1), one Pb(1), and one P(2) atom. is represented by the CIF card [CIF]
data_FeP2PbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.448
_cell_length_b   5.463
_cell_length_c   14.056
_cell_angle_alpha   67.848
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   600.765
_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  0.350  0.926  0.894  1.0
  Fe  Fe1  1  0.850  0.074  0.606  1.0
  Fe  Fe2  1  0.650  0.074  0.106  1.0
  Fe  Fe3  1  0.150  0.926  0.394  1.0
  P  P4  1  0.539  0.915  0.336  1.0
  P  P5  1  0.300  0.296  0.018  1.0
  P  P6  1  0.200  0.296  0.518  1.0
  P  P7  1  0.461  0.085  0.664  1.0
  P  P8  1  0.961  0.915  0.836  1.0
  P  P9  1  0.700  0.704  0.982  1.0
  P  P10  1  0.039  0.085  0.164  1.0
  P  P11  1  0.800  0.704  0.482  1.0
  Pb  Pb12  1  0.675  0.434  0.778  1.0
  Pb  Pb13  1  0.825  0.434  0.278  1.0
  Pb  Pb14  1  0.325  0.566  0.222  1.0
  Pb  Pb15  1  0.175  0.566  0.722  1.0
  O  O16  1  0.563  0.214  0.298  1.0
  O  O17  1  0.596  0.921  0.904  1.0
  O  O18  1  0.121  0.206  0.234  1.0
  O  O19  1  0.096  0.079  0.596  1.0
  O  O20  1  0.865  0.166  0.151  1.0
  O  O21  1  0.063  0.786  0.202  1.0
  O  O22  1  0.635  0.166  0.651  1.0
  O  O23  1  0.621  0.794  0.266  1.0
  O  O24  1  0.904  0.921  0.404  1.0
  O  O25  1  0.365  0.834  0.349  1.0
  O  O26  1  0.117  0.216  0.051  1.0
  O  O27  1  0.671  0.433  0.975  1.0
  O  O28  1  0.188  0.295  0.409  1.0
  O  O29  1  0.617  0.784  0.449  1.0
  O  O30  1  0.437  0.786  0.702  1.0
  O  O31  1  0.879  0.794  0.766  1.0
  O  O32  1  0.812  0.705  0.591  1.0
  O  O33  1  0.379  0.206  0.734  1.0
  O  O34  1  0.829  0.433  0.475  1.0
  O  O35  1  0.171  0.567  0.525  1.0
  O  O36  1  0.937  0.214  0.798  1.0
  O  O37  1  0.883  0.784  0.949  1.0
  O  O38  1  0.404  0.079  0.096  1.0
  O  O39  1  0.329  0.567  0.025  1.0
  O  O40  1  0.688  0.705  0.091  1.0
  O  O41  1  0.312  0.295  0.909  1.0
  O  O42  1  0.383  0.216  0.551  1.0
  O  O43  1  0.135  0.834  0.849  1.0
[/CIF]
.