The compound described by Na2NiO2 is Ilmenite-like structured and crystallizes in the orthorhombic Immm space group. Na(1) is bonded to four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing NaO4 trigonal pyramids. Ni(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded to four equivalent Na(1) and two equivalent Ni(1) atoms to form a mixture of corner and edge-sharing ONa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-23°. is represented by the CIF file [CIF]
data_Na2NiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.523
_cell_length_b   5.523
_cell_length_c   5.523
_cell_angle_alpha   149.887
_cell_angle_beta   131.342
_cell_angle_gamma   58.292
_symmetry_Int_Tables_number   1
_cell_volume   63.002
_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  0.321  0.321  0.000  1.0
  Na  Na1  1  0.679  0.679  0.000  1.0
  Ni  Ni2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.131  0.631  0.500  1.0
  O  O4  1  0.869  0.369  0.500  1.0
[/CIF]
.
The compound described by Na2NiO2 is Ilmenite-like structured and crystallizes in the orthorhombic Immm space group. Na(1) is bonded to four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing NaO4 trigonal pyramids. Ni(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded to four equivalent Na(1) and two equivalent Ni(1) atoms to form a mixture of corner and edge-sharing ONa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-23°. is represented by the CIF file [CIF]
data_Na2NiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.523
_cell_length_b   5.523
_cell_length_c   5.523
_cell_angle_alpha   149.887
_cell_angle_beta   131.342
_cell_angle_gamma   58.292
_symmetry_Int_Tables_number   1
_cell_volume   63.002
_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  0.321  0.321  0.000  1.0
  Na  Na1  1  0.679  0.679  0.000  1.0
  Ni  Ni2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.131  0.631  0.500  1.0
  O  O4  1  0.869  0.369  0.500  1.0
[/CIF]
.