The compound described by Na2Ni(SO6)2 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(3) atoms to form NaO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with four equivalent S(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-51°. Ni(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form NiO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-51°. S(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra and corners with four equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and one S(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one Ni(1) atom. is represented by the CIF file [CIF]
data_Na2Ni(SO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.463
_cell_length_b   8.211
_cell_length_c   11.136
_cell_angle_alpha   90.000
_cell_angle_beta   97.058
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   495.705
_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  0.106  0.066  0.360  1.0
  Na  Na1  1  0.894  0.934  0.640  1.0
  Na  Na2  1  0.894  0.566  0.140  1.0
  Na  Na3  1  0.106  0.434  0.860  1.0
  Ni  Ni4  1  0.000  0.000  0.000  1.0
  Ni  Ni5  1  0.000  0.500  0.500  1.0
  S  S6  1  0.377  0.287  0.138  1.0
  S  S7  1  0.623  0.713  0.862  1.0
  S  S8  1  0.623  0.787  0.362  1.0
  S  S9  1  0.377  0.213  0.638  1.0
  O  O10  1  0.328  0.270  0.266  1.0
  O  O11  1  0.672  0.730  0.734  1.0
  O  O12  1  0.672  0.770  0.234  1.0
  O  O13  1  0.328  0.230  0.766  1.0
  O  O14  1  0.121  0.823  0.082  1.0
  O  O15  1  0.879  0.177  0.918  1.0
  O  O16  1  0.879  0.323  0.418  1.0
  O  O17  1  0.121  0.677  0.582  1.0
  O  O18  1  0.218  0.414  0.075  1.0
  O  O19  1  0.782  0.586  0.925  1.0
  O  O20  1  0.782  0.914  0.425  1.0
  O  O21  1  0.218  0.086  0.575  1.0
  O  O22  1  0.640  0.331  0.138  1.0
  O  O23  1  0.360  0.669  0.862  1.0
  O  O24  1  0.360  0.831  0.362  1.0
  O  O25  1  0.640  0.169  0.638  1.0
  O  O26  1  0.336  0.126  0.076  1.0
  O  O27  1  0.664  0.874  0.924  1.0
  O  O28  1  0.664  0.626  0.424  1.0
  O  O29  1  0.336  0.374  0.576  1.0
  O  O30  1  0.081  0.509  0.347  1.0
  O  O31  1  0.919  0.491  0.653  1.0
  O  O32  1  0.919  0.009  0.153  1.0
  O  O33  1  0.081  0.991  0.847  1.0
[/CIF]
.
The compound described by Na2Ni(SO6)2 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(3) atoms to form NaO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with four equivalent S(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-51°. Ni(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form NiO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-51°. S(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra and corners with four equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and one S(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one Ni(1) atom. is represented by the CIF file [CIF]
data_Na2Ni(SO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.463
_cell_length_b   8.211
_cell_length_c   11.136
_cell_angle_alpha   90.000
_cell_angle_beta   97.058
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   495.705
_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  0.106  0.066  0.360  1.0
  Na  Na1  1  0.894  0.934  0.640  1.0
  Na  Na2  1  0.894  0.566  0.140  1.0
  Na  Na3  1  0.106  0.434  0.860  1.0
  Ni  Ni4  1  0.000  0.000  0.000  1.0
  Ni  Ni5  1  0.000  0.500  0.500  1.0
  S  S6  1  0.377  0.287  0.138  1.0
  S  S7  1  0.623  0.713  0.862  1.0
  S  S8  1  0.623  0.787  0.362  1.0
  S  S9  1  0.377  0.213  0.638  1.0
  O  O10  1  0.328  0.270  0.266  1.0
  O  O11  1  0.672  0.730  0.734  1.0
  O  O12  1  0.672  0.770  0.234  1.0
  O  O13  1  0.328  0.230  0.766  1.0
  O  O14  1  0.121  0.823  0.082  1.0
  O  O15  1  0.879  0.177  0.918  1.0
  O  O16  1  0.879  0.323  0.418  1.0
  O  O17  1  0.121  0.677  0.582  1.0
  O  O18  1  0.218  0.414  0.075  1.0
  O  O19  1  0.782  0.586  0.925  1.0
  O  O20  1  0.782  0.914  0.425  1.0
  O  O21  1  0.218  0.086  0.575  1.0
  O  O22  1  0.640  0.331  0.138  1.0
  O  O23  1  0.360  0.669  0.862  1.0
  O  O24  1  0.360  0.831  0.362  1.0
  O  O25  1  0.640  0.169  0.638  1.0
  O  O26  1  0.336  0.126  0.076  1.0
  O  O27  1  0.664  0.874  0.924  1.0
  O  O28  1  0.664  0.626  0.424  1.0
  O  O29  1  0.336  0.374  0.576  1.0
  O  O30  1  0.081  0.509  0.347  1.0
  O  O31  1  0.919  0.491  0.653  1.0
  O  O32  1  0.919  0.009  0.153  1.0
  O  O33  1  0.081  0.991  0.847  1.0
[/CIF]
.