The structure described by K6Na2Fe7O38 crystallizes in the trigonal R32 space group. K(1) is bonded in a 6-coordinate geometry to one O(2), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Na(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted edge-sharing FeO6 octahedra. In the second Fe site, Fe(2) is bonded to six equivalent O(6) atoms to form distorted edge-sharing FeO6 octahedra. In the third Fe site, Fe(3) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form distorted edge-sharing FeO6 octahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Fe(3) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one Fe(1), one Fe(2), and one Fe(3) atom. In the third O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one O(1) atom. In the fourth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one O(4) atom. In the fifth O site, O(7) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Fe(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Na(1), and one O(3) atom. In the seventh O site, O(3) is bonded in a trigonal non-coplanar geometry to three equivalent O(2) atoms. is represented by the CIF card [CIF]
data_K6Na2Fe7O38
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.397
_cell_length_b   9.397
_cell_length_c   9.397
_cell_angle_alpha   88.422
_cell_angle_beta   88.422
_cell_angle_gamma   88.422
_symmetry_Int_Tables_number   1
_cell_volume   828.818
_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
  K  K0  1  0.358  0.358  0.865  1.0
  K  K1  1  0.358  0.865  0.358  1.0
  K  K2  1  0.642  0.135  0.642  1.0
  K  K3  1  0.865  0.358  0.358  1.0
  K  K4  1  0.642  0.642  0.135  1.0
  K  K5  1  0.135  0.642  0.642  1.0
  Na  Na6  1  0.246  0.246  0.246  1.0
  Na  Na7  1  0.754  0.754  0.754  1.0
  Fe  Fe8  1  0.235  0.765  0.000  1.0
  Fe  Fe9  1  0.765  0.000  0.235  1.0
  Fe  Fe10  1  0.000  0.235  0.765  1.0
  Fe  Fe11  1  0.000  0.000  0.000  1.0
  Fe  Fe12  1  0.751  0.249  0.000  1.0
  Fe  Fe13  1  0.249  0.000  0.751  1.0
  Fe  Fe14  1  0.000  0.751  0.249  1.0
  O  O15  1  0.109  0.467  0.109  1.0
  O  O16  1  0.467  0.109  0.109  1.0
  O  O17  1  0.891  0.891  0.533  1.0
  O  O18  1  0.109  0.109  0.467  1.0
  O  O19  1  0.533  0.891  0.891  1.0
  O  O20  1  0.891  0.533  0.891  1.0
  O  O21  1  0.434  0.415  0.250  1.0
  O  O22  1  0.415  0.250  0.434  1.0
  O  O23  1  0.566  0.750  0.585  1.0
  O  O24  1  0.250  0.434  0.415  1.0
  O  O25  1  0.585  0.566  0.750  1.0
  O  O26  1  0.750  0.585  0.566  1.0
  O  O27  1  0.400  0.400  0.400  1.0
  O  O28  1  0.600  0.600  0.600  1.0
  O  O29  1  0.900  0.397  0.905  1.0
  O  O30  1  0.397  0.905  0.900  1.0
  O  O31  1  0.100  0.095  0.603  1.0
  O  O32  1  0.905  0.900  0.397  1.0
  O  O33  1  0.603  0.100  0.095  1.0
  O  O34  1  0.095  0.603  0.100  1.0
  O  O35  1  0.367  0.129  0.707  1.0
  O  O36  1  0.129  0.707  0.367  1.0
  O  O37  1  0.633  0.293  0.871  1.0
  O  O38  1  0.707  0.367  0.129  1.0
  O  O39  1  0.871  0.633  0.293  1.0
  O  O40  1  0.293  0.871  0.633  1.0
  O  O41  1  0.135  0.134  0.887  1.0
  O  O42  1  0.134  0.887  0.135  1.0
  O  O43  1  0.865  0.113  0.866  1.0
  O  O44  1  0.887  0.135  0.134  1.0
  O  O45  1  0.866  0.865  0.113  1.0
  O  O46  1  0.113  0.866  0.865  1.0
  O  O47  1  0.113  0.365  0.692  1.0
  O  O48  1  0.365  0.692  0.113  1.0
  O  O49  1  0.887  0.308  0.635  1.0
  O  O50  1  0.692  0.113  0.365  1.0
  O  O51  1  0.635  0.887  0.308  1.0
  O  O52  1  0.308  0.635  0.887  1.0
[/CIF]
.
The structure described by K6Na2Fe7O38 crystallizes in the trigonal R32 space group. K(1) is bonded in a 6-coordinate geometry to one O(2), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Na(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted edge-sharing FeO6 octahedra. In the second Fe site, Fe(2) is bonded to six equivalent O(6) atoms to form distorted edge-sharing FeO6 octahedra. In the third Fe site, Fe(3) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form distorted edge-sharing FeO6 octahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Fe(3) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one Fe(1), one Fe(2), and one Fe(3) atom. In the third O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one O(1) atom. In the fourth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one O(4) atom. In the fifth O site, O(7) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Fe(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Na(1), and one O(3) atom. In the seventh O site, O(3) is bonded in a trigonal non-coplanar geometry to three equivalent O(2) atoms. is represented by the CIF card [CIF]
data_K6Na2Fe7O38
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.397
_cell_length_b   9.397
_cell_length_c   9.397
_cell_angle_alpha   88.422
_cell_angle_beta   88.422
_cell_angle_gamma   88.422
_symmetry_Int_Tables_number   1
_cell_volume   828.818
_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
  K  K0  1  0.358  0.358  0.865  1.0
  K  K1  1  0.358  0.865  0.358  1.0
  K  K2  1  0.642  0.135  0.642  1.0
  K  K3  1  0.865  0.358  0.358  1.0
  K  K4  1  0.642  0.642  0.135  1.0
  K  K5  1  0.135  0.642  0.642  1.0
  Na  Na6  1  0.246  0.246  0.246  1.0
  Na  Na7  1  0.754  0.754  0.754  1.0
  Fe  Fe8  1  0.235  0.765  0.000  1.0
  Fe  Fe9  1  0.765  0.000  0.235  1.0
  Fe  Fe10  1  0.000  0.235  0.765  1.0
  Fe  Fe11  1  0.000  0.000  0.000  1.0
  Fe  Fe12  1  0.751  0.249  0.000  1.0
  Fe  Fe13  1  0.249  0.000  0.751  1.0
  Fe  Fe14  1  0.000  0.751  0.249  1.0
  O  O15  1  0.109  0.467  0.109  1.0
  O  O16  1  0.467  0.109  0.109  1.0
  O  O17  1  0.891  0.891  0.533  1.0
  O  O18  1  0.109  0.109  0.467  1.0
  O  O19  1  0.533  0.891  0.891  1.0
  O  O20  1  0.891  0.533  0.891  1.0
  O  O21  1  0.434  0.415  0.250  1.0
  O  O22  1  0.415  0.250  0.434  1.0
  O  O23  1  0.566  0.750  0.585  1.0
  O  O24  1  0.250  0.434  0.415  1.0
  O  O25  1  0.585  0.566  0.750  1.0
  O  O26  1  0.750  0.585  0.566  1.0
  O  O27  1  0.400  0.400  0.400  1.0
  O  O28  1  0.600  0.600  0.600  1.0
  O  O29  1  0.900  0.397  0.905  1.0
  O  O30  1  0.397  0.905  0.900  1.0
  O  O31  1  0.100  0.095  0.603  1.0
  O  O32  1  0.905  0.900  0.397  1.0
  O  O33  1  0.603  0.100  0.095  1.0
  O  O34  1  0.095  0.603  0.100  1.0
  O  O35  1  0.367  0.129  0.707  1.0
  O  O36  1  0.129  0.707  0.367  1.0
  O  O37  1  0.633  0.293  0.871  1.0
  O  O38  1  0.707  0.367  0.129  1.0
  O  O39  1  0.871  0.633  0.293  1.0
  O  O40  1  0.293  0.871  0.633  1.0
  O  O41  1  0.135  0.134  0.887  1.0
  O  O42  1  0.134  0.887  0.135  1.0
  O  O43  1  0.865  0.113  0.866  1.0
  O  O44  1  0.887  0.135  0.134  1.0
  O  O45  1  0.866  0.865  0.113  1.0
  O  O46  1  0.113  0.866  0.865  1.0
  O  O47  1  0.113  0.365  0.692  1.0
  O  O48  1  0.365  0.692  0.113  1.0
  O  O49  1  0.887  0.308  0.635  1.0
  O  O50  1  0.692  0.113  0.365  1.0
  O  O51  1  0.635  0.887  0.308  1.0
  O  O52  1  0.308  0.635  0.887  1.0
[/CIF]
.