The crystal structure described by Na14Fe2O9 crystallizes in the triclinic P1 space group. There are fourteen inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra, and  an edgeedge with one Na(8)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(1), one O(6), one O(8), and one O(9) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Fe(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Na(9)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra, corners with three equivalent Na(5)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the fourth Na site, Na(4) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(5)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the fifth Na site, Na(5) is bonded to one O(1), one O(2), one O(3), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the sixth Na site, Na(6) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the seventh Na site, Na(7) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Na(6)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the eighth Na site, Na(8) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Na(6)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the ninth Na site, Na(9) is bonded to one O(4), one O(6), one O(8), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(12)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the tenth Na site, Na(10) is bonded to one O(5), one O(6), one O(8), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(12)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the eleventh Na site, Na(11) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(13)O4 tetrahedra, corners with three equivalent Na(14)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the twelfth Na site, Na(12) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the thirteenth Na site, Na(13) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(11)O4 tetrahedra, corners with three equivalent Na(14)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the fourteenth Na site, Na(14) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(11)O4 tetrahedra, corners with three equivalent Na(13)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), one O(6), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Na(2)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Na(9)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Na(1)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra, and  an edgeedge with one Na(8)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a body-centered cubic geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), and one Na(8) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), one Na(8), and one Fe(2) atom. In the third O site, O(3) is bonded in a 7-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), one Na(8), and one Fe(1) atom. In the fourth O site, O(4) is bonded to one Na(1), one Na(11), one Na(13), one Na(14), one Na(6), one Na(9), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the fifth O site, O(5) is bonded to one Na(1), one Na(10), one Na(11), one Na(13), one Na(14), one Na(8), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the sixth O site, O(6) is bonded to one Na(10), one Na(11), one Na(12), one Na(2), one Na(4), one Na(9), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the seventh O site, O(7) is bonded to one Na(1), one Na(11), one Na(12), one Na(13), one Na(14), one Na(7), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the eighth O site, O(8) is bonded to one Na(10), one Na(12), one Na(13), one Na(2), one Na(3), one Na(9), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the ninth O site, O(9) is bonded to one Na(10), one Na(12), one Na(14), one Na(2), one Na(5), one Na(9), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. is represented by the CIF file [CIF]
data_Na14Fe2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.674
_cell_length_b   6.710
_cell_length_c   9.427
_cell_angle_alpha   89.646
_cell_angle_beta   89.256
_cell_angle_gamma   60.393
_symmetry_Int_Tables_number   1
_cell_volume   367.018
_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
  Na  Na0  1  0.000  0.999  0.252  1.0
  Na  Na1  1  1.000  1.000  0.748  1.0
  Na  Na2  1  0.360  0.680  0.908  1.0
  Na  Na3  1  0.961  0.361  0.907  1.0
  Na  Na4  1  0.678  0.962  0.908  1.0
  Na  Na5  1  0.320  0.042  0.091  1.0
  Na  Na6  1  0.037  0.641  0.092  1.0
  Na  Na7  1  0.639  0.322  0.093  1.0
  Na  Na8  1  0.378  0.932  0.590  1.0
  Na  Na9  1  0.686  0.375  0.593  1.0
  Na  Na10  1  0.068  0.308  0.408  1.0
  Na  Na11  1  0.934  0.689  0.592  1.0
  Na  Na12  1  0.314  0.624  0.407  1.0
  Na  Na13  1  0.623  0.065  0.409  1.0
  Fe  Fe14  1  0.329  0.333  0.741  1.0
  Fe  Fe15  1  0.670  0.667  0.260  1.0
  O  O16  1  0.999  0.001  1.000  1.0
  O  O17  1  0.662  0.668  0.041  1.0
  O  O18  1  0.336  0.336  0.959  1.0
  O  O19  1  0.360  0.947  0.334  1.0
  O  O20  1  0.699  0.357  0.337  1.0
  O  O21  1  0.058  0.303  0.661  1.0
  O  O22  1  0.944  0.693  0.339  1.0
  O  O23  1  0.303  0.642  0.664  1.0
  O  O24  1  0.639  0.051  0.664  1.0
[/CIF]
.
The crystal structure described by Na14Fe2O9 crystallizes in the triclinic P1 space group. There are fourteen inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra, and  an edgeedge with one Na(8)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(1), one O(6), one O(8), and one O(9) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Fe(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Na(9)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra, corners with three equivalent Na(5)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the fourth Na site, Na(4) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(5)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the fifth Na site, Na(5) is bonded to one O(1), one O(2), one O(3), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(3)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the sixth Na site, Na(6) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the seventh Na site, Na(7) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Na(6)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the eighth Na site, Na(8) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Na(6)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the ninth Na site, Na(9) is bonded to one O(4), one O(6), one O(8), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(12)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the tenth Na site, Na(10) is bonded to one O(5), one O(6), one O(8), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(12)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the eleventh Na site, Na(11) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(13)O4 tetrahedra, corners with three equivalent Na(14)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the twelfth Na site, Na(12) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the thirteenth Na site, Na(13) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(11)O4 tetrahedra, corners with three equivalent Na(14)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. In the fourteenth Na site, Na(14) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Na(11)O4 tetrahedra, corners with three equivalent Na(13)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Fe(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), one O(6), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Na(2)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(12)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra, and  an edgeedge with one Na(9)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Na(12)O4 tetrahedra,  a cornercorner with one Na(13)O4 tetrahedra,  a cornercorner with one Na(14)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(5)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with three equivalent Na(1)O4 tetrahedra,  an edgeedge with one Na(11)O4 tetrahedra,  an edgeedge with one Na(13)O4 tetrahedra,  an edgeedge with one Na(14)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra, and  an edgeedge with one Na(8)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a body-centered cubic geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), and one Na(8) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), one Na(8), and one Fe(2) atom. In the third O site, O(3) is bonded in a 7-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), one Na(8), and one Fe(1) atom. In the fourth O site, O(4) is bonded to one Na(1), one Na(11), one Na(13), one Na(14), one Na(6), one Na(9), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the fifth O site, O(5) is bonded to one Na(1), one Na(10), one Na(11), one Na(13), one Na(14), one Na(8), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the sixth O site, O(6) is bonded to one Na(10), one Na(11), one Na(12), one Na(2), one Na(4), one Na(9), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the seventh O site, O(7) is bonded to one Na(1), one Na(11), one Na(12), one Na(13), one Na(14), one Na(7), and one Fe(2) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the eighth O site, O(8) is bonded to one Na(10), one Na(12), one Na(13), one Na(2), one Na(3), one Na(9), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. In the ninth O site, O(9) is bonded to one Na(10), one Na(12), one Na(14), one Na(2), one Na(5), one Na(9), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ONa6Fe pentagonal bipyramids. is represented by the CIF file [CIF]
data_Na14Fe2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.674
_cell_length_b   6.710
_cell_length_c   9.427
_cell_angle_alpha   89.646
_cell_angle_beta   89.256
_cell_angle_gamma   60.393
_symmetry_Int_Tables_number   1
_cell_volume   367.018
_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
  Na  Na0  1  0.000  0.999  0.252  1.0
  Na  Na1  1  1.000  1.000  0.748  1.0
  Na  Na2  1  0.360  0.680  0.908  1.0
  Na  Na3  1  0.961  0.361  0.907  1.0
  Na  Na4  1  0.678  0.962  0.908  1.0
  Na  Na5  1  0.320  0.042  0.091  1.0
  Na  Na6  1  0.037  0.641  0.092  1.0
  Na  Na7  1  0.639  0.322  0.093  1.0
  Na  Na8  1  0.378  0.932  0.590  1.0
  Na  Na9  1  0.686  0.375  0.593  1.0
  Na  Na10  1  0.068  0.308  0.408  1.0
  Na  Na11  1  0.934  0.689  0.592  1.0
  Na  Na12  1  0.314  0.624  0.407  1.0
  Na  Na13  1  0.623  0.065  0.409  1.0
  Fe  Fe14  1  0.329  0.333  0.741  1.0
  Fe  Fe15  1  0.670  0.667  0.260  1.0
  O  O16  1  0.999  0.001  1.000  1.0
  O  O17  1  0.662  0.668  0.041  1.0
  O  O18  1  0.336  0.336  0.959  1.0
  O  O19  1  0.360  0.947  0.334  1.0
  O  O20  1  0.699  0.357  0.337  1.0
  O  O21  1  0.058  0.303  0.661  1.0
  O  O22  1  0.944  0.693  0.339  1.0
  O  O23  1  0.303  0.642  0.664  1.0
  O  O24  1  0.639  0.051  0.664  1.0
[/CIF]
.