The structure described by Rb4Fe2O5 crystallizes in the monoclinic C2/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Fe(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing FeO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Fe(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to four equivalent Rb(3) and two equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.482
_cell_length_b   9.482
_cell_length_c   7.259
_cell_angle_alpha   84.832
_cell_angle_beta   84.832
_cell_angle_gamma   135.918
_symmetry_Int_Tables_number   1
_cell_volume   440.751
_cell_formula_units_Z   2
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  0.462  0.538  0.250  1.0
  Rb  Rb1  1  0.538  0.462  0.750  1.0
  Rb  Rb2  1  0.021  0.979  0.250  1.0
  Rb  Rb3  1  0.979  0.021  0.750  1.0
  Rb  Rb4  1  0.467  0.827  0.886  1.0
  Rb  Rb5  1  0.173  0.533  0.614  1.0
  Rb  Rb6  1  0.827  0.467  0.386  1.0
  Rb  Rb7  1  0.533  0.173  0.114  1.0
  Fe  Fe8  1  0.305  0.997  0.595  1.0
  Fe  Fe9  1  0.997  0.305  0.095  1.0
  Fe  Fe10  1  0.695  0.003  0.405  1.0
  Fe  Fe11  1  0.003  0.695  0.905  1.0
  O  O12  1  0.207  0.361  0.956  1.0
  O  O13  1  0.274  0.982  0.866  1.0
  O  O14  1  0.361  0.207  0.456  1.0
  O  O15  1  0.726  0.018  0.134  1.0
  O  O16  1  0.982  0.274  0.366  1.0
  O  O17  1  0.000  0.500  0.000  1.0
  O  O18  1  0.639  0.793  0.544  1.0
  O  O19  1  0.018  0.726  0.634  1.0
  O  O20  1  0.793  0.639  0.044  1.0
  O  O21  1  0.500  0.000  0.500  1.0
[/CIF]
.
The structure described by Rb4Fe2O5 crystallizes in the monoclinic C2/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Fe(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing FeO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Fe(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to four equivalent Rb(3) and two equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.482
_cell_length_b   9.482
_cell_length_c   7.259
_cell_angle_alpha   84.832
_cell_angle_beta   84.832
_cell_angle_gamma   135.918
_symmetry_Int_Tables_number   1
_cell_volume   440.751
_cell_formula_units_Z   2
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  0.462  0.538  0.250  1.0
  Rb  Rb1  1  0.538  0.462  0.750  1.0
  Rb  Rb2  1  0.021  0.979  0.250  1.0
  Rb  Rb3  1  0.979  0.021  0.750  1.0
  Rb  Rb4  1  0.467  0.827  0.886  1.0
  Rb  Rb5  1  0.173  0.533  0.614  1.0
  Rb  Rb6  1  0.827  0.467  0.386  1.0
  Rb  Rb7  1  0.533  0.173  0.114  1.0
  Fe  Fe8  1  0.305  0.997  0.595  1.0
  Fe  Fe9  1  0.997  0.305  0.095  1.0
  Fe  Fe10  1  0.695  0.003  0.405  1.0
  Fe  Fe11  1  0.003  0.695  0.905  1.0
  O  O12  1  0.207  0.361  0.956  1.0
  O  O13  1  0.274  0.982  0.866  1.0
  O  O14  1  0.361  0.207  0.456  1.0
  O  O15  1  0.726  0.018  0.134  1.0
  O  O16  1  0.982  0.274  0.366  1.0
  O  O17  1  0.000  0.500  0.000  1.0
  O  O18  1  0.639  0.793  0.544  1.0
  O  O19  1  0.018  0.726  0.634  1.0
  O  O20  1  0.793  0.639  0.044  1.0
  O  O21  1  0.500  0.000  0.500  1.0
[/CIF]
.