The crystal structure described by Na6NiO4 crystallizes in the orthorhombic Amm2 space group. There are ten inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra, and edges with four equivalent Na(7)O4 tetrahedra. In the second Na site, Na(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra, and edges with four equivalent Na(8)O4 tetrahedra. In the third Na site, Na(3) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and edges with four equivalent Na(9)O4 tetrahedra. In the fourth Na site, Na(4) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and edges with four equivalent Na(10)O4 tetrahedra. In the fifth Na site, Na(5) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form NaO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra, edges with two equivalent Na(10)O4 tetrahedra, edges with two equivalent Na(6)O4 tetrahedra, and edges with two equivalent Na(9)O4 tetrahedra. In the sixth Na site, Na(6) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form NaO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra, edges with two equivalent Na(5)O4 tetrahedra, edges with two equivalent Na(7)O4 tetrahedra, and edges with two equivalent Na(8)O4 tetrahedra. In the seventh Na site, Na(7) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Ni(2)O4 tetrahedra. In the eighth Na site, Na(8) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Ni(2)O4 tetrahedra. In the ninth Na site, Na(9) is bonded to one O(1), one O(3), one O(5), and one O(7) 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(2)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Ni(3)O4 tetrahedra. In the tenth Na site, Na(10) is bonded to one O(2), one O(4), one O(6), and one O(7) 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(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Ni(1)O4 tetrahedra. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(4) and two equivalent O(6) atoms to form NiO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra, and edges with four equivalent Na(10)O4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(1), one O(2), and two equivalent O(7) atoms to form NiO4 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, corners with two equivalent Na(5)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra, edges with two equivalent Na(7)O4 tetrahedra, and edges with two equivalent Na(8)O4 tetrahedra. In the third Ni site, Ni(3) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form distorted NiO4 tetrahedra that share corners with two equivalent Na(1)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra, and edges with four equivalent Na(9)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), two equivalent Na(8), two equivalent Na(9), and one Ni(2) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the second O site, O(2) is bonded to one Na(1), one Na(4), two equivalent Na(10), two equivalent Na(7), and one Ni(2) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the third O site, O(3) is bonded to one Na(1), one Na(3), two equivalent Na(7), two equivalent Na(9), and one Ni(3) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), two equivalent Na(10), two equivalent Na(8), and one Ni(1) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the fifth O site, O(5) is bonded to one Na(5), one Na(6), two equivalent Na(8), two equivalent Na(9), and one Ni(3) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the sixth O site, O(6) is bonded to one Na(5), one Na(6), two equivalent Na(10), two equivalent Na(7), and one Ni(1) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the seventh O site, O(7) is bonded to one Na(10), one Na(5), one Na(6), one Na(7), one Na(8), one Na(9), and one Ni(2) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. is represented by the CIF card [CIF]
data_Na6NiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.464
_cell_length_b   7.460
_cell_length_c   7.513
_cell_angle_alpha   90.001
_cell_angle_beta   89.996
_cell_angle_gamma   89.997
_symmetry_Int_Tables_number   1
_cell_volume   306.252
_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
  Na  Na0  1  0.344  0.250  0.250  1.0
  Na  Na1  1  0.844  0.250  0.250  1.0
  Na  Na2  1  0.656  0.750  0.750  1.0
  Na  Na3  1  0.156  0.750  0.750  1.0
  Na  Na4  1  0.251  0.537  0.037  1.0
  Na  Na5  1  0.251  0.963  0.037  1.0
  Na  Na6  1  0.251  0.537  0.463  1.0
  Na  Na7  1  0.251  0.963  0.463  1.0
  Na  Na8  1  0.749  0.038  0.536  1.0
  Na  Na9  1  0.749  0.462  0.537  1.0
  Na  Na10  1  0.749  0.038  0.963  1.0
  Na  Na11  1  0.749  0.463  0.964  1.0
  Ni  Ni12  1  0.750  0.750  0.250  1.0
  Ni  Ni13  1  0.245  0.250  0.750  1.0
  O  O14  1  0.073  0.250  0.997  1.0
  O  O15  1  0.572  0.995  0.250  1.0
  O  O16  1  0.572  0.505  0.250  1.0
  O  O17  1  0.073  0.250  0.503  1.0
  O  O18  1  0.928  0.750  0.495  1.0
  O  O19  1  0.429  0.007  0.750  1.0
  O  O20  1  0.429  0.493  0.750  1.0
  O  O21  1  0.928  0.750  0.005  1.0
[/CIF]
.
The crystal structure described by Na6NiO4 crystallizes in the orthorhombic Amm2 space group. There are ten inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra, and edges with four equivalent Na(7)O4 tetrahedra. In the second Na site, Na(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra, and edges with four equivalent Na(8)O4 tetrahedra. In the third Na site, Na(3) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and edges with four equivalent Na(9)O4 tetrahedra. In the fourth Na site, Na(4) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form NaO4 tetrahedra that share corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra, and edges with four equivalent Na(10)O4 tetrahedra. In the fifth Na site, Na(5) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form NaO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra, edges with two equivalent Na(10)O4 tetrahedra, edges with two equivalent Na(6)O4 tetrahedra, and edges with two equivalent Na(9)O4 tetrahedra. In the sixth Na site, Na(6) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form NaO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra, edges with two equivalent Na(5)O4 tetrahedra, edges with two equivalent Na(7)O4 tetrahedra, and edges with two equivalent Na(8)O4 tetrahedra. In the seventh Na site, Na(7) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(1)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Ni(2)O4 tetrahedra. In the eighth Na site, Na(8) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Na(3)O4 tetrahedra,  a cornercorner with one Na(4)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(10)O4 tetrahedra,  an edgeedge with one Na(2)O4 tetrahedra,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Na(9)O4 tetrahedra, and  an edgeedge with one Ni(2)O4 tetrahedra. In the ninth Na site, Na(9) is bonded to one O(1), one O(3), one O(5), and one O(7) 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(2)O4 tetrahedra,  a cornercorner with one Na(7)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with three equivalent Na(8)O4 tetrahedra, corners with three equivalent Na(9)O4 tetrahedra,  an edgeedge with one Na(3)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Ni(3)O4 tetrahedra. In the tenth Na site, Na(10) is bonded to one O(2), one O(4), one O(6), and one O(7) 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(8)O4 tetrahedra,  a cornercorner with one Na(9)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with three equivalent Na(10)O4 tetrahedra, corners with three equivalent Na(7)O4 tetrahedra,  an edgeedge with one Na(4)O4 tetrahedra,  an edgeedge with one Na(5)O4 tetrahedra,  an edgeedge with one Na(7)O4 tetrahedra,  an edgeedge with one Na(8)O4 tetrahedra, and  an edgeedge with one Ni(1)O4 tetrahedra. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(4) and two equivalent O(6) atoms to form NiO4 tetrahedra that share corners with two equivalent Na(2)O4 tetrahedra, corners with two equivalent Na(4)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra, and edges with four equivalent Na(10)O4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(1), one O(2), and two equivalent O(7) atoms to form NiO4 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, corners with two equivalent Na(5)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with four equivalent Na(10)O4 tetrahedra, corners with four equivalent Na(9)O4 tetrahedra, edges with two equivalent Na(7)O4 tetrahedra, and edges with two equivalent Na(8)O4 tetrahedra. In the third Ni site, Ni(3) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form distorted NiO4 tetrahedra that share corners with two equivalent Na(1)O4 tetrahedra, corners with two equivalent Na(3)O4 tetrahedra, corners with two equivalent Na(5)O4 tetrahedra, corners with two equivalent Na(6)O4 tetrahedra, corners with four equivalent Na(7)O4 tetrahedra, corners with four equivalent Na(8)O4 tetrahedra, and edges with four equivalent Na(9)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), two equivalent Na(8), two equivalent Na(9), and one Ni(2) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the second O site, O(2) is bonded to one Na(1), one Na(4), two equivalent Na(10), two equivalent Na(7), and one Ni(2) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the third O site, O(3) is bonded to one Na(1), one Na(3), two equivalent Na(7), two equivalent Na(9), and one Ni(3) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), two equivalent Na(10), two equivalent Na(8), and one Ni(1) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the fifth O site, O(5) is bonded to one Na(5), one Na(6), two equivalent Na(8), two equivalent Na(9), and one Ni(3) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the sixth O site, O(6) is bonded to one Na(5), one Na(6), two equivalent Na(10), two equivalent Na(7), and one Ni(1) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. In the seventh O site, O(7) is bonded to one Na(10), one Na(5), one Na(6), one Na(7), one Na(8), one Na(9), and one Ni(2) atom to form a mixture of distorted corner and edge-sharing ONa6Ni pentagonal bipyramids. is represented by the CIF card [CIF]
data_Na6NiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.464
_cell_length_b   7.460
_cell_length_c   7.513
_cell_angle_alpha   90.001
_cell_angle_beta   89.996
_cell_angle_gamma   89.997
_symmetry_Int_Tables_number   1
_cell_volume   306.252
_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
  Na  Na0  1  0.344  0.250  0.250  1.0
  Na  Na1  1  0.844  0.250  0.250  1.0
  Na  Na2  1  0.656  0.750  0.750  1.0
  Na  Na3  1  0.156  0.750  0.750  1.0
  Na  Na4  1  0.251  0.537  0.037  1.0
  Na  Na5  1  0.251  0.963  0.037  1.0
  Na  Na6  1  0.251  0.537  0.463  1.0
  Na  Na7  1  0.251  0.963  0.463  1.0
  Na  Na8  1  0.749  0.038  0.536  1.0
  Na  Na9  1  0.749  0.462  0.537  1.0
  Na  Na10  1  0.749  0.038  0.963  1.0
  Na  Na11  1  0.749  0.463  0.964  1.0
  Ni  Ni12  1  0.750  0.750  0.250  1.0
  Ni  Ni13  1  0.245  0.250  0.750  1.0
  O  O14  1  0.073  0.250  0.997  1.0
  O  O15  1  0.572  0.995  0.250  1.0
  O  O16  1  0.572  0.505  0.250  1.0
  O  O17  1  0.073  0.250  0.503  1.0
  O  O18  1  0.928  0.750  0.495  1.0
  O  O19  1  0.429  0.007  0.750  1.0
  O  O20  1  0.429  0.493  0.750  1.0
  O  O21  1  0.928  0.750  0.005  1.0
[/CIF]
.