The material described by Na(FeO2)2 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(7), and one O(8) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(3), and one O(4) atom. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), and one O(9) atom. There are eight inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(15), one O(16), one O(2), one O(4), and one O(5) atom to form edge-sharing FeO6 octahedra. In the second Fe site, Fe(2) is bonded to one O(12), one O(15), one O(16), one O(2), one O(4), and one O(7) atom to form edge-sharing FeO6 octahedra. In the third Fe site, Fe(3) is bonded to one O(1), one O(13), one O(14), one O(3), one O(6), and one O(9) atom to form edge-sharing FeO6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(11), one O(13), one O(14), one O(3), and one O(8) atom to form edge-sharing FeO6 octahedra. In the fifth Fe site, Fe(5) is bonded to one O(10), one O(12), one O(16), one O(4), one O(5), and one O(7) atom to form edge-sharing FeO6 octahedra. In the sixth Fe site, Fe(6) is bonded to one O(10), one O(12), one O(15), one O(2), one O(5), and one O(7) atom to form edge-sharing FeO6 octahedra. In the seventh Fe site, Fe(7) is bonded to one O(1), one O(11), one O(13), one O(6), one O(8), and one O(9) atom to form edge-sharing FeO6 octahedra. In the eighth Fe site, Fe(8) is bonded to one O(11), one O(14), one O(3), one O(6), one O(8), and one O(9) atom to form edge-sharing FeO6 octahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(4), one Fe(3), one Fe(4), and one Fe(7) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid, corners with two equivalent O(14)Na2Fe3 trigonal bipyramids, corners with two equivalent O(4)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid, edges with two equivalent O(3)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Fe(1), one Fe(2), and one Fe(6) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid, corners with two equivalent O(16)Na2Fe3 trigonal bipyramids, corners with two equivalent O(3)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid, edges with two equivalent O(4)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the third O site, O(3) is bonded to one Na(2), one Na(4), one Fe(3), one Fe(4), and one Fe(8) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid, corners with two equivalent O(13)Na2Fe3 trigonal bipyramids, corners with two equivalent O(2)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, edges with two equivalent O(1)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Fe(1), one Fe(2), and one Fe(5) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid, corners with two equivalent O(1)Na2Fe3 trigonal bipyramids, corners with two equivalent O(15)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, edges with two equivalent O(2)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the fifth O site, O(5) is bonded to one Na(3), one Fe(1), one Fe(5), and one Fe(6) atom to form distorted ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid, corners with two equivalent O(12)NaFe3 trigonal pyramids, corners with two equivalent O(7)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(10)NaFe3 trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(3), one Fe(3), one Fe(7), and one Fe(8) atom to form distorted ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid, corners with two equivalent O(8)NaFe3 trigonal pyramids,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Na(1), one Fe(2), one Fe(5), and one Fe(6) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid, corners with two equivalent O(10)NaFe3 trigonal pyramids, corners with two equivalent O(5)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(12)NaFe3 trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(1), one Fe(4), one Fe(7), and one Fe(8) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid, corners with two equivalent O(6)NaFe3 trigonal pyramids, corners with two equivalent O(9)NaFe3 trigonal pyramids,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid. In the ninth O site, O(9) is bonded to one Na(4), one Fe(3), one Fe(7), and one Fe(8) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid, corners with two equivalent O(8)NaFe3 trigonal pyramids,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(6)NaFe3 trigonal pyramid. In the tenth O site, O(10) is bonded to one Na(4), one Fe(1), one Fe(5), and one Fe(6) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid, corners with two equivalent O(12)NaFe3 trigonal pyramids, corners with two equivalent O(7)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(5)NaFe3 trigonal pyramid. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Fe(4), one Fe(7), and one Fe(8) atom. In the twelfth O site, O(12) is bonded to one Na(2), one Fe(2), one Fe(5), and one Fe(6) atom to form distorted ONaFe3 trigonal pyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid, corners with two equivalent O(10)NaFe3 trigonal pyramids, corners with two equivalent O(5)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Na(1), one Na(3), one Fe(3), one Fe(4), and one Fe(7) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid, corners with two equivalent O(16)Na2Fe3 trigonal bipyramids, corners with two equivalent O(3)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid, edges with two equivalent O(14)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the fourteenth O site, O(14) is bonded to one Na(1), one Na(3), one Fe(3), one Fe(4), and one Fe(8) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid, corners with two equivalent O(1)Na2Fe3 trigonal bipyramids, corners with two equivalent O(15)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, edges with two equivalent O(13)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the fifteenth O site, O(15) is bonded to one Na(1), one Na(3), one Fe(1), one Fe(2), and one Fe(6) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid, corners with two equivalent O(14)Na2Fe3 trigonal bipyramids, corners with two equivalent O(4)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid, edges with two equivalent O(16)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Na(1), one Na(3), one Fe(1), one Fe(2), and one Fe(5) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid, corners with two equivalent O(13)Na2Fe3 trigonal bipyramids, corners with two equivalent O(2)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, edges with two equivalent O(15)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. is represented by the CIF card [CIF]
data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.114
_cell_length_b   5.900
_cell_length_c   11.501
_cell_angle_alpha   90.134
_cell_angle_beta   90.051
_cell_angle_gamma   90.076
_symmetry_Int_Tables_number   1
_cell_volume   347.021
_cell_formula_units_Z   4
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
  Na  Na0  1  0.967  0.751  0.750  1.0
  Na  Na1  1  0.643  0.751  0.251  1.0
  Na  Na2  1  0.357  0.248  0.750  1.0
  Na  Na3  1  0.028  0.250  0.250  1.0
  Fe  Fe4  1  0.998  0.253  0.996  1.0
  Fe  Fe5  1  0.003  0.751  0.007  1.0
  Fe  Fe6  1  0.998  0.250  0.507  1.0
  Fe  Fe7  1  0.002  0.750  0.493  1.0
  Fe  Fe8  1  0.500  0.498  1.000  1.0
  Fe  Fe9  1  0.501  0.999  0.999  1.0
  Fe  Fe10  1  0.500  1.000  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.500  1.0
  O  O12  1  0.821  0.003  0.408  1.0
  O  O13  1  0.844  0.016  0.092  1.0
  O  O14  1  0.837  0.499  0.405  1.0
  O  O15  1  0.827  0.489  0.090  1.0
  O  O16  1  0.665  0.261  0.911  1.0
  O  O17  1  0.656  0.235  0.591  1.0
  O  O18  1  0.668  0.740  0.912  1.0
  O  O19  1  0.668  0.762  0.588  1.0
  O  O20  1  0.331  0.239  0.413  1.0
  O  O21  1  0.320  0.258  0.085  1.0
  O  O22  1  0.344  0.766  0.409  1.0
  O  O23  1  0.350  0.736  0.090  1.0
  O  O24  1  0.179  0.996  0.592  1.0
  O  O25  1  0.163  0.502  0.595  1.0
  O  O26  1  0.157  0.009  0.907  1.0
  O  O27  1  0.173  0.489  0.910  1.0
[/CIF]
.
The material described by Na(FeO2)2 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(7), and one O(8) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(3), and one O(4) atom. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), and one O(9) atom. There are eight inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(15), one O(16), one O(2), one O(4), and one O(5) atom to form edge-sharing FeO6 octahedra. In the second Fe site, Fe(2) is bonded to one O(12), one O(15), one O(16), one O(2), one O(4), and one O(7) atom to form edge-sharing FeO6 octahedra. In the third Fe site, Fe(3) is bonded to one O(1), one O(13), one O(14), one O(3), one O(6), and one O(9) atom to form edge-sharing FeO6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(11), one O(13), one O(14), one O(3), and one O(8) atom to form edge-sharing FeO6 octahedra. In the fifth Fe site, Fe(5) is bonded to one O(10), one O(12), one O(16), one O(4), one O(5), and one O(7) atom to form edge-sharing FeO6 octahedra. In the sixth Fe site, Fe(6) is bonded to one O(10), one O(12), one O(15), one O(2), one O(5), and one O(7) atom to form edge-sharing FeO6 octahedra. In the seventh Fe site, Fe(7) is bonded to one O(1), one O(11), one O(13), one O(6), one O(8), and one O(9) atom to form edge-sharing FeO6 octahedra. In the eighth Fe site, Fe(8) is bonded to one O(11), one O(14), one O(3), one O(6), one O(8), and one O(9) atom to form edge-sharing FeO6 octahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(4), one Fe(3), one Fe(4), and one Fe(7) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid, corners with two equivalent O(14)Na2Fe3 trigonal bipyramids, corners with two equivalent O(4)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid, edges with two equivalent O(3)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Fe(1), one Fe(2), and one Fe(6) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid, corners with two equivalent O(16)Na2Fe3 trigonal bipyramids, corners with two equivalent O(3)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid, edges with two equivalent O(4)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the third O site, O(3) is bonded to one Na(2), one Na(4), one Fe(3), one Fe(4), and one Fe(8) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid, corners with two equivalent O(13)Na2Fe3 trigonal bipyramids, corners with two equivalent O(2)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, edges with two equivalent O(1)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Fe(1), one Fe(2), and one Fe(5) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid, corners with two equivalent O(1)Na2Fe3 trigonal bipyramids, corners with two equivalent O(15)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, edges with two equivalent O(2)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the fifth O site, O(5) is bonded to one Na(3), one Fe(1), one Fe(5), and one Fe(6) atom to form distorted ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid, corners with two equivalent O(12)NaFe3 trigonal pyramids, corners with two equivalent O(7)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(10)NaFe3 trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(3), one Fe(3), one Fe(7), and one Fe(8) atom to form distorted ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid, corners with two equivalent O(8)NaFe3 trigonal pyramids,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Na(1), one Fe(2), one Fe(5), and one Fe(6) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(12)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid, corners with two equivalent O(10)NaFe3 trigonal pyramids, corners with two equivalent O(5)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(12)NaFe3 trigonal pyramid. In the eighth O site, O(8) is bonded to one Na(1), one Fe(4), one Fe(7), and one Fe(8) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(13)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(14)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(15)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(16)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid, corners with two equivalent O(6)NaFe3 trigonal pyramids, corners with two equivalent O(9)NaFe3 trigonal pyramids,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid. In the ninth O site, O(9) is bonded to one Na(4), one Fe(3), one Fe(7), and one Fe(8) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(10)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid, corners with two equivalent O(8)NaFe3 trigonal pyramids,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(6)NaFe3 trigonal pyramid. In the tenth O site, O(10) is bonded to one Na(4), one Fe(1), one Fe(5), and one Fe(6) atom to form ONaFe3 trigonal pyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(9)NaFe3 trigonal pyramid, corners with two equivalent O(12)NaFe3 trigonal pyramids, corners with two equivalent O(7)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(5)NaFe3 trigonal pyramid. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Fe(4), one Fe(7), and one Fe(8) atom. In the twelfth O site, O(12) is bonded to one Na(2), one Fe(2), one Fe(5), and one Fe(6) atom to form distorted ONaFe3 trigonal pyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid, corners with two equivalent O(10)NaFe3 trigonal pyramids, corners with two equivalent O(5)NaFe3 trigonal pyramids,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Na(1), one Na(3), one Fe(3), one Fe(4), and one Fe(7) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(1)Na2Fe3 trigonal bipyramid, corners with two equivalent O(16)Na2Fe3 trigonal bipyramids, corners with two equivalent O(3)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(1)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(15)Na2Fe3 trigonal bipyramid, edges with two equivalent O(14)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the fourteenth O site, O(14) is bonded to one Na(1), one Na(3), one Fe(3), one Fe(4), and one Fe(8) atom to form ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(3)Na2Fe3 trigonal bipyramid, corners with two equivalent O(1)Na2Fe3 trigonal bipyramids, corners with two equivalent O(15)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(16)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(3)Na2Fe3 trigonal bipyramid, edges with two equivalent O(13)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(6)NaFe3 trigonal pyramid,  an edgeedge with one O(8)NaFe3 trigonal pyramid, and  an edgeedge with one O(9)NaFe3 trigonal pyramid. In the fifteenth O site, O(15) is bonded to one Na(1), one Na(3), one Fe(1), one Fe(2), and one Fe(6) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(2)Na2Fe3 trigonal bipyramid, corners with two equivalent O(14)Na2Fe3 trigonal bipyramids, corners with two equivalent O(4)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(13)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(2)Na2Fe3 trigonal bipyramid, edges with two equivalent O(16)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Na(1), one Na(3), one Fe(1), one Fe(2), and one Fe(5) atom to form distorted ONa2Fe3 trigonal bipyramids that share  a cornercorner with one O(4)Na2Fe3 trigonal bipyramid, corners with two equivalent O(13)Na2Fe3 trigonal bipyramids, corners with two equivalent O(2)Na2Fe3 trigonal bipyramids,  a cornercorner with one O(5)NaFe3 trigonal pyramid,  a cornercorner with one O(6)NaFe3 trigonal pyramid,  a cornercorner with one O(7)NaFe3 trigonal pyramid,  a cornercorner with one O(8)NaFe3 trigonal pyramid,  an edgeedge with one O(14)Na2Fe3 trigonal bipyramid,  an edgeedge with one O(4)Na2Fe3 trigonal bipyramid, edges with two equivalent O(15)Na2Fe3 trigonal bipyramids,  an edgeedge with one O(10)NaFe3 trigonal pyramid,  an edgeedge with one O(12)NaFe3 trigonal pyramid,  an edgeedge with one O(5)NaFe3 trigonal pyramid, and  an edgeedge with one O(7)NaFe3 trigonal pyramid. is represented by the CIF card [CIF]
data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.114
_cell_length_b   5.900
_cell_length_c   11.501
_cell_angle_alpha   90.134
_cell_angle_beta   90.051
_cell_angle_gamma   90.076
_symmetry_Int_Tables_number   1
_cell_volume   347.021
_cell_formula_units_Z   4
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
  Na  Na0  1  0.967  0.751  0.750  1.0
  Na  Na1  1  0.643  0.751  0.251  1.0
  Na  Na2  1  0.357  0.248  0.750  1.0
  Na  Na3  1  0.028  0.250  0.250  1.0
  Fe  Fe4  1  0.998  0.253  0.996  1.0
  Fe  Fe5  1  0.003  0.751  0.007  1.0
  Fe  Fe6  1  0.998  0.250  0.507  1.0
  Fe  Fe7  1  0.002  0.750  0.493  1.0
  Fe  Fe8  1  0.500  0.498  1.000  1.0
  Fe  Fe9  1  0.501  0.999  0.999  1.0
  Fe  Fe10  1  0.500  1.000  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.500  1.0
  O  O12  1  0.821  0.003  0.408  1.0
  O  O13  1  0.844  0.016  0.092  1.0
  O  O14  1  0.837  0.499  0.405  1.0
  O  O15  1  0.827  0.489  0.090  1.0
  O  O16  1  0.665  0.261  0.911  1.0
  O  O17  1  0.656  0.235  0.591  1.0
  O  O18  1  0.668  0.740  0.912  1.0
  O  O19  1  0.668  0.762  0.588  1.0
  O  O20  1  0.331  0.239  0.413  1.0
  O  O21  1  0.320  0.258  0.085  1.0
  O  O22  1  0.344  0.766  0.409  1.0
  O  O23  1  0.350  0.736  0.090  1.0
  O  O24  1  0.179  0.996  0.592  1.0
  O  O25  1  0.163  0.502  0.595  1.0
  O  O26  1  0.157  0.009  0.907  1.0
  O  O27  1  0.173  0.489  0.910  1.0
[/CIF]
.