The material structure described by K2NiO2 crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to five equivalent O(1) atoms to form a mixture of corner and edge-sharing KO5 square pyramids. Ni(1) is bonded in a linear geometry to two equivalent O(1) atoms. O(1) is bonded to five equivalent K(1) and one Ni(1) atom to form a mixture of distorted corner and edge-sharing OK5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-11°. is represented by the CIF card [CIF]
data_K2NiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.924
_cell_length_b   3.924
_cell_length_c   6.948
_cell_angle_alpha   106.401
_cell_angle_beta   106.401
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   98.065
_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
  K  K0  1  0.654  0.654  0.309  1.0
  K  K1  1  0.346  0.346  0.691  1.0
  Ni  Ni2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.133  0.133  0.265  1.0
  O  O4  1  0.867  0.867  0.735  1.0
[/CIF]
.
The material structure described by K2NiO2 crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to five equivalent O(1) atoms to form a mixture of corner and edge-sharing KO5 square pyramids. Ni(1) is bonded in a linear geometry to two equivalent O(1) atoms. O(1) is bonded to five equivalent K(1) and one Ni(1) atom to form a mixture of distorted corner and edge-sharing OK5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-11°. is represented by the CIF card [CIF]
data_K2NiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.924
_cell_length_b   3.924
_cell_length_c   6.948
_cell_angle_alpha   106.401
_cell_angle_beta   106.401
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   98.065
_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
  K  K0  1  0.654  0.654  0.309  1.0
  K  K1  1  0.346  0.346  0.691  1.0
  Ni  Ni2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.133  0.133  0.265  1.0
  O  O4  1  0.867  0.867  0.735  1.0
[/CIF]
.