The material structure described by RbFeP2O7 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(4), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form FeO6 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(2), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-47°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-51°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Rb(1), one P(1), and one P(2) atom. In the second O site, O(6) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Fe(1), and one P(1) atom. In the third O site, O(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Fe(1), and one P(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Fe(1), and one P(2) atom. In the fifth O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Fe(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Fe(1), and one P(2) atom. In the seventh O site, O(4) is bonded in a distorted linear geometry to one Rb(1), one Fe(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbFeP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.158
_cell_length_b   7.630
_cell_length_c   8.413
_cell_angle_alpha   74.091
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   627.082
_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
  Rb  Rb0  1  0.687  0.187  0.948  1.0
  Rb  Rb1  1  0.187  0.813  0.552  1.0
  Rb  Rb2  1  0.313  0.813  0.052  1.0
  Rb  Rb3  1  0.813  0.187  0.448  1.0
  Fe  Fe4  1  0.400  0.239  0.241  1.0
  Fe  Fe5  1  0.900  0.761  0.259  1.0
  Fe  Fe6  1  0.600  0.761  0.759  1.0
  Fe  Fe7  1  0.100  0.239  0.741  1.0
  P  P8  1  0.404  0.130  0.669  1.0
  P  P9  1  0.904  0.870  0.831  1.0
  P  P10  1  0.596  0.870  0.331  1.0
  P  P11  1  0.096  0.130  0.169  1.0
  P  P12  1  0.131  0.432  0.314  1.0
  P  P13  1  0.631  0.568  0.186  1.0
  P  P14  1  0.869  0.568  0.686  1.0
  P  P15  1  0.369  0.432  0.814  1.0
  O  O16  1  0.277  0.442  0.262  1.0
  O  O17  1  0.777  0.558  0.238  1.0
  O  O18  1  0.723  0.558  0.738  1.0
  O  O19  1  0.223  0.442  0.762  1.0
  O  O20  1  0.998  0.991  0.272  1.0
  O  O21  1  0.498  0.009  0.228  1.0
  O  O22  1  0.002  0.009  0.728  1.0
  O  O23  1  0.502  0.991  0.772  1.0
  O  O24  1  0.104  0.322  0.491  1.0
  O  O25  1  0.604  0.678  0.009  1.0
  O  O26  1  0.896  0.678  0.509  1.0
  O  O27  1  0.396  0.322  0.991  1.0
  O  O28  1  0.088  0.151  0.986  1.0
  O  O29  1  0.588  0.849  0.514  1.0
  O  O30  1  0.912  0.849  0.014  1.0
  O  O31  1  0.412  0.151  0.486  1.0
  O  O32  1  0.053  0.326  0.197  1.0
  O  O33  1  0.553  0.674  0.303  1.0
  O  O34  1  0.947  0.674  0.803  1.0
  O  O35  1  0.447  0.326  0.697  1.0
  O  O36  1  0.265  0.085  0.740  1.0
  O  O37  1  0.765  0.915  0.760  1.0
  O  O38  1  0.735  0.915  0.260  1.0
  O  O39  1  0.235  0.085  0.240  1.0
  O  O40  1  0.427  0.624  0.768  1.0
  O  O41  1  0.927  0.376  0.732  1.0
  O  O42  1  0.573  0.376  0.232  1.0
  O  O43  1  0.073  0.624  0.268  1.0
[/CIF]
.
The material structure described by RbFeP2O7 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(4), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form FeO6 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(2), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-47°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-51°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Rb(1), one P(1), and one P(2) atom. In the second O site, O(6) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Fe(1), and one P(1) atom. In the third O site, O(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Fe(1), and one P(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Fe(1), and one P(2) atom. In the fifth O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Fe(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Fe(1), and one P(2) atom. In the seventh O site, O(4) is bonded in a distorted linear geometry to one Rb(1), one Fe(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbFeP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.158
_cell_length_b   7.630
_cell_length_c   8.413
_cell_angle_alpha   74.091
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   627.082
_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
  Rb  Rb0  1  0.687  0.187  0.948  1.0
  Rb  Rb1  1  0.187  0.813  0.552  1.0
  Rb  Rb2  1  0.313  0.813  0.052  1.0
  Rb  Rb3  1  0.813  0.187  0.448  1.0
  Fe  Fe4  1  0.400  0.239  0.241  1.0
  Fe  Fe5  1  0.900  0.761  0.259  1.0
  Fe  Fe6  1  0.600  0.761  0.759  1.0
  Fe  Fe7  1  0.100  0.239  0.741  1.0
  P  P8  1  0.404  0.130  0.669  1.0
  P  P9  1  0.904  0.870  0.831  1.0
  P  P10  1  0.596  0.870  0.331  1.0
  P  P11  1  0.096  0.130  0.169  1.0
  P  P12  1  0.131  0.432  0.314  1.0
  P  P13  1  0.631  0.568  0.186  1.0
  P  P14  1  0.869  0.568  0.686  1.0
  P  P15  1  0.369  0.432  0.814  1.0
  O  O16  1  0.277  0.442  0.262  1.0
  O  O17  1  0.777  0.558  0.238  1.0
  O  O18  1  0.723  0.558  0.738  1.0
  O  O19  1  0.223  0.442  0.762  1.0
  O  O20  1  0.998  0.991  0.272  1.0
  O  O21  1  0.498  0.009  0.228  1.0
  O  O22  1  0.002  0.009  0.728  1.0
  O  O23  1  0.502  0.991  0.772  1.0
  O  O24  1  0.104  0.322  0.491  1.0
  O  O25  1  0.604  0.678  0.009  1.0
  O  O26  1  0.896  0.678  0.509  1.0
  O  O27  1  0.396  0.322  0.991  1.0
  O  O28  1  0.088  0.151  0.986  1.0
  O  O29  1  0.588  0.849  0.514  1.0
  O  O30  1  0.912  0.849  0.014  1.0
  O  O31  1  0.412  0.151  0.486  1.0
  O  O32  1  0.053  0.326  0.197  1.0
  O  O33  1  0.553  0.674  0.303  1.0
  O  O34  1  0.947  0.674  0.803  1.0
  O  O35  1  0.447  0.326  0.697  1.0
  O  O36  1  0.265  0.085  0.740  1.0
  O  O37  1  0.765  0.915  0.760  1.0
  O  O38  1  0.735  0.915  0.260  1.0
  O  O39  1  0.235  0.085  0.240  1.0
  O  O40  1  0.427  0.624  0.768  1.0
  O  O41  1  0.927  0.376  0.732  1.0
  O  O42  1  0.573  0.376  0.232  1.0
  O  O43  1  0.073  0.624  0.268  1.0
[/CIF]
.