The compound described by NaMgNiO2 crystallizes in the monoclinic Cm space group. Na(1) is bonded in a 2-coordinate geometry to one O(2) and three equivalent O(1) atoms. Mg(1) is bonded to one O(1) and three equivalent O(2) atoms to form corner-sharing MgO4 tetrahedra. Ni(1) is bonded in a distorted trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), one Mg(1), and three equivalent Ni(1) atoms. In the second O site, O(2) is bonded to one Na(1) and three equivalent Mg(1) atoms to form corner-sharing ONaMg3 tetrahedra. is represented by the CIF card [CIF]
data_NaMgNiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.727
_cell_length_b   7.275
_cell_length_c   7.275
_cell_angle_alpha   28.064
_cell_angle_beta   26.914
_cell_angle_gamma   26.914
_symmetry_Int_Tables_number   1
_cell_volume   65.991
_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  0.408  0.585  0.585  1.0
  Mg  Mg1  1  0.481  0.346  0.346  1.0
  Ni  Ni2  1  0.944  0.962  0.962  1.0
  O  O3  1  0.213  0.321  0.321  1.0
  O  O4  1  0.858  0.704  0.704  1.0
[/CIF]
.
The compound described by NaMgNiO2 crystallizes in the monoclinic Cm space group. Na(1) is bonded in a 2-coordinate geometry to one O(2) and three equivalent O(1) atoms. Mg(1) is bonded to one O(1) and three equivalent O(2) atoms to form corner-sharing MgO4 tetrahedra. Ni(1) is bonded in a distorted trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), one Mg(1), and three equivalent Ni(1) atoms. In the second O site, O(2) is bonded to one Na(1) and three equivalent Mg(1) atoms to form corner-sharing ONaMg3 tetrahedra. is represented by the CIF card [CIF]
data_NaMgNiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.727
_cell_length_b   7.275
_cell_length_c   7.275
_cell_angle_alpha   28.064
_cell_angle_beta   26.914
_cell_angle_gamma   26.914
_symmetry_Int_Tables_number   1
_cell_volume   65.991
_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  0.408  0.585  0.585  1.0
  Mg  Mg1  1  0.481  0.346  0.346  1.0
  Ni  Ni2  1  0.944  0.962  0.962  1.0
  O  O3  1  0.213  0.321  0.321  1.0
  O  O4  1  0.858  0.704  0.704  1.0
[/CIF]
.