The material structure described by Rb4K2Fe2O5 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. K(1) is bonded to four equivalent O(2) atoms to form distorted edge-sharing KO4 tetrahedra. Fe(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to two equivalent Rb(1), two equivalent Rb(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent K(1), and one Fe(1) atom. is represented by the CIF card [CIF]
data_K2Rb4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.961
_cell_length_b   6.978
_cell_length_c   6.961
_cell_angle_alpha   89.951
_cell_angle_beta   119.652
_cell_angle_gamma   89.951
_symmetry_Int_Tables_number   1
_cell_volume   293.799
_cell_formula_units_Z   1
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  0.802  0.195  0.802  1.0
  Fe  Fe1  1  0.198  0.805  0.198  1.0
  K  K2  1  0.777  0.500  0.223  1.0
  K  K3  1  0.223  0.500  0.777  1.0
  O  O4  1  0.000  1.000  0.000  1.0
  O  O5  1  0.567  0.288  0.841  1.0
  O  O6  1  0.433  0.712  0.159  1.0
  O  O7  1  0.159  0.712  0.433  1.0
  O  O8  1  0.841  0.288  0.567  1.0
  Rb  Rb9  1  0.758  0.000  0.242  1.0
  Rb  Rb10  1  0.242  0.000  0.758  1.0
  Rb  Rb11  1  0.336  0.316  0.336  1.0
  Rb  Rb12  1  0.664  0.684  0.664  1.0
[/CIF]
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The material structure described by Rb4K2Fe2O5 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. K(1) is bonded to four equivalent O(2) atoms to form distorted edge-sharing KO4 tetrahedra. Fe(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to two equivalent Rb(1), two equivalent Rb(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent K(1), and one Fe(1) atom. is represented by the CIF card [CIF]
data_K2Rb4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.961
_cell_length_b   6.978
_cell_length_c   6.961
_cell_angle_alpha   89.951
_cell_angle_beta   119.652
_cell_angle_gamma   89.951
_symmetry_Int_Tables_number   1
_cell_volume   293.799
_cell_formula_units_Z   1
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  0.802  0.195  0.802  1.0
  Fe  Fe1  1  0.198  0.805  0.198  1.0
  K  K2  1  0.777  0.500  0.223  1.0
  K  K3  1  0.223  0.500  0.777  1.0
  O  O4  1  0.000  1.000  0.000  1.0
  O  O5  1  0.567  0.288  0.841  1.0
  O  O6  1  0.433  0.712  0.159  1.0
  O  O7  1  0.159  0.712  0.433  1.0
  O  O8  1  0.841  0.288  0.567  1.0
  Rb  Rb9  1  0.758  0.000  0.242  1.0
  Rb  Rb10  1  0.242  0.000  0.758  1.0
  Rb  Rb11  1  0.336  0.316  0.336  1.0
  Rb  Rb12  1  0.664  0.684  0.664  1.0
[/CIF]
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