The structure described by K4Fe2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(2), and three equivalent O(1) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), and three equivalent O(2) atoms. Fe(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing FeO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(2), three equivalent K(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to two equivalent K(1), three equivalent K(2), and one Fe(1) atom to form distorted OK5Fe octahedra that share corners with two equivalent O(3)K4Fe2 octahedra, corners with four equivalent O(2)K5Fe octahedra, edges with two equivalent O(3)K4Fe2 octahedra, and edges with two equivalent O(2)K5Fe octahedra. The corner-sharing octahedral tilt angles range from 17-71°. In the third O site, O(3) is bonded to two equivalent K(1), two equivalent K(2), and two equivalent Fe(1) atoms to form a mixture of distorted corner and edge-sharing OK4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 17-71°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.939
_cell_length_b   6.382
_cell_length_c   10.015
_cell_angle_alpha   75.876
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   368.121
_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
  K  K0  1  0.878  0.731  0.517  1.0
  K  K1  1  0.091  0.906  0.836  1.0
  K  K2  1  0.122  0.269  0.483  1.0
  K  K3  1  0.409  0.906  0.336  1.0
  K  K4  1  0.909  0.094  0.164  1.0
  K  K5  1  0.378  0.269  0.983  1.0
  K  K6  1  0.622  0.731  0.017  1.0
  K  K7  1  0.591  0.094  0.664  1.0
  Fe  Fe8  1  0.115  0.592  0.156  1.0
  Fe  Fe9  1  0.385  0.592  0.656  1.0
  Fe  Fe10  1  0.615  0.408  0.344  1.0
  Fe  Fe11  1  0.885  0.408  0.844  1.0
  O  O12  1  0.145  0.392  0.730  1.0
  O  O13  1  0.855  0.608  0.270  1.0
  O  O14  1  0.264  0.862  0.597  1.0
  O  O15  1  0.355  0.392  0.230  1.0
  O  O16  1  0.764  0.138  0.903  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.736  0.138  0.403  1.0
  O  O19  1  0.645  0.608  0.770  1.0
  O  O20  1  0.000  0.500  0.000  1.0
  O  O21  1  0.236  0.862  0.097  1.0
[/CIF]
.
The structure described by K4Fe2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(2), and three equivalent O(1) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), and three equivalent O(2) atoms. Fe(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing FeO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(2), three equivalent K(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to two equivalent K(1), three equivalent K(2), and one Fe(1) atom to form distorted OK5Fe octahedra that share corners with two equivalent O(3)K4Fe2 octahedra, corners with four equivalent O(2)K5Fe octahedra, edges with two equivalent O(3)K4Fe2 octahedra, and edges with two equivalent O(2)K5Fe octahedra. The corner-sharing octahedral tilt angles range from 17-71°. In the third O site, O(3) is bonded to two equivalent K(1), two equivalent K(2), and two equivalent Fe(1) atoms to form a mixture of distorted corner and edge-sharing OK4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 17-71°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.939
_cell_length_b   6.382
_cell_length_c   10.015
_cell_angle_alpha   75.876
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   368.121
_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
  K  K0  1  0.878  0.731  0.517  1.0
  K  K1  1  0.091  0.906  0.836  1.0
  K  K2  1  0.122  0.269  0.483  1.0
  K  K3  1  0.409  0.906  0.336  1.0
  K  K4  1  0.909  0.094  0.164  1.0
  K  K5  1  0.378  0.269  0.983  1.0
  K  K6  1  0.622  0.731  0.017  1.0
  K  K7  1  0.591  0.094  0.664  1.0
  Fe  Fe8  1  0.115  0.592  0.156  1.0
  Fe  Fe9  1  0.385  0.592  0.656  1.0
  Fe  Fe10  1  0.615  0.408  0.344  1.0
  Fe  Fe11  1  0.885  0.408  0.844  1.0
  O  O12  1  0.145  0.392  0.730  1.0
  O  O13  1  0.855  0.608  0.270  1.0
  O  O14  1  0.264  0.862  0.597  1.0
  O  O15  1  0.355  0.392  0.230  1.0
  O  O16  1  0.764  0.138  0.903  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.736  0.138  0.403  1.0
  O  O19  1  0.645  0.608  0.770  1.0
  O  O20  1  0.000  0.500  0.000  1.0
  O  O21  1  0.236  0.862  0.097  1.0
[/CIF]
.