The material structure described by K2Na4Fe2O5 crystallizes in the tetragonal P4_2/mnm space group. K(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. In the second Na site, Na(2) is bonded to four equivalent O(2) atoms to form distorted corner-sharing NaO4 trigonal pyramids. 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 K(1), two equivalent Na(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 7-coordinate geometry to two equivalent K(1), two equivalent Na(1), two equivalent Na(2), and one Fe(1) atom. is represented by the CIF file [CIF]
data_K2Na4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.486
_cell_length_b   6.486
_cell_length_c   10.542
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   443.549
_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  0.311  0.689  1.000  1.0
  K  K1  1  0.689  0.311  0.000  1.0
  K  K2  1  0.811  0.811  0.500  1.0
  K  K3  1  0.189  0.189  0.500  1.0
  Na  Na4  1  0.000  1.000  0.224  1.0
  Na  Na5  1  0.000  1.000  0.776  1.0
  Na  Na6  1  0.500  0.500  0.724  1.0
  Na  Na7  1  0.500  0.500  0.276  1.0
  Na  Na8  1  0.000  0.500  0.250  1.0
  Na  Na9  1  0.000  0.500  0.750  1.0
  Na  Na10  1  0.500  1.000  0.250  1.0
  Na  Na11  1  0.500  1.000  0.750  1.0
  Fe  Fe12  1  0.792  0.792  1.000  1.0
  Fe  Fe13  1  0.708  0.292  0.500  1.0
  Fe  Fe14  1  0.208  0.208  0.000  1.0
  Fe  Fe15  1  0.292  0.708  0.500  1.0
  O  O16  1  0.000  0.000  0.000  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.291  0.291  0.163  1.0
  O  O19  1  0.709  0.709  0.837  1.0
  O  O20  1  0.709  0.709  0.163  1.0
  O  O21  1  0.209  0.791  0.663  1.0
  O  O22  1  0.209  0.791  0.337  1.0
  O  O23  1  0.291  0.291  0.837  1.0
  O  O24  1  0.791  0.209  0.337  1.0
  O  O25  1  0.791  0.209  0.663  1.0
[/CIF]
.
The material structure described by K2Na4Fe2O5 crystallizes in the tetragonal P4_2/mnm space group. K(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. In the second Na site, Na(2) is bonded to four equivalent O(2) atoms to form distorted corner-sharing NaO4 trigonal pyramids. 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 K(1), two equivalent Na(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 7-coordinate geometry to two equivalent K(1), two equivalent Na(1), two equivalent Na(2), and one Fe(1) atom. is represented by the CIF file [CIF]
data_K2Na4Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.486
_cell_length_b   6.486
_cell_length_c   10.542
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   443.549
_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  0.311  0.689  1.000  1.0
  K  K1  1  0.689  0.311  0.000  1.0
  K  K2  1  0.811  0.811  0.500  1.0
  K  K3  1  0.189  0.189  0.500  1.0
  Na  Na4  1  0.000  1.000  0.224  1.0
  Na  Na5  1  0.000  1.000  0.776  1.0
  Na  Na6  1  0.500  0.500  0.724  1.0
  Na  Na7  1  0.500  0.500  0.276  1.0
  Na  Na8  1  0.000  0.500  0.250  1.0
  Na  Na9  1  0.000  0.500  0.750  1.0
  Na  Na10  1  0.500  1.000  0.250  1.0
  Na  Na11  1  0.500  1.000  0.750  1.0
  Fe  Fe12  1  0.792  0.792  1.000  1.0
  Fe  Fe13  1  0.708  0.292  0.500  1.0
  Fe  Fe14  1  0.208  0.208  0.000  1.0
  Fe  Fe15  1  0.292  0.708  0.500  1.0
  O  O16  1  0.000  0.000  0.000  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.291  0.291  0.163  1.0
  O  O19  1  0.709  0.709  0.837  1.0
  O  O20  1  0.709  0.709  0.163  1.0
  O  O21  1  0.209  0.791  0.663  1.0
  O  O22  1  0.209  0.791  0.337  1.0
  O  O23  1  0.291  0.291  0.837  1.0
  O  O24  1  0.791  0.209  0.337  1.0
  O  O25  1  0.791  0.209  0.663  1.0
[/CIF]
.