The structure described by Co3NiO8 is trigonal omega-derived structured and crystallizes in the monoclinic P2/m space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CoO6 octahedra that share  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1) and four equivalent O(6) atoms to form CoO6 octahedra that share edges with two equivalent Ni(1)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. In the third Co site, Co(3) is bonded to two equivalent O(2) and four equivalent O(5) atoms to form CoO6 octahedra that share edges with two equivalent Ni(2)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form NiO6 octahedra that share edges with two equivalent Co(2)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. In the second Ni site, Ni(2) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form NiO6 octahedra that share edges with two equivalent Co(3)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Co(2) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Co(3) and two equivalent Co(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Ni(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Ni(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Co(1), one Co(3), and one Ni(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one Ni(1) atom. is represented by the CIF card [CIF]
data_Co3NiO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.605
_cell_length_b   5.628
_cell_length_c   5.644
_cell_angle_alpha   90.202
_cell_angle_beta   119.742
_cell_angle_gamma   119.844
_symmetry_Int_Tables_number   1
_cell_volume   126.446
_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
  Co  Co0  1  0.000  1.000  0.500  1.0
  Co  Co1  1  0.500  0.000  0.000  1.0
  Co  Co2  1  0.500  0.000  0.500  1.0
  Ni  Ni3  1  0.000  0.500  0.500  1.0
  O  O4  1  0.528  0.792  0.263  1.0
  O  O5  1  0.472  0.208  0.736  1.0
  O  O6  1  0.027  0.762  0.292  1.0
  O  O7  1  0.471  0.764  0.735  1.0
  O  O8  1  0.027  0.764  0.735  1.0
  O  O9  1  0.973  0.236  0.265  1.0
  O  O10  1  0.529  0.236  0.265  1.0
  O  O11  1  0.973  0.238  0.708  1.0
[/CIF]
.
The structure described by Co3NiO8 is trigonal omega-derived structured and crystallizes in the monoclinic P2/m space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CoO6 octahedra that share  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1) and four equivalent O(6) atoms to form CoO6 octahedra that share edges with two equivalent Ni(1)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. In the third Co site, Co(3) is bonded to two equivalent O(2) and four equivalent O(5) atoms to form CoO6 octahedra that share edges with two equivalent Ni(2)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form NiO6 octahedra that share edges with two equivalent Co(2)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. In the second Ni site, Ni(2) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form NiO6 octahedra that share edges with two equivalent Co(3)O6 octahedra and edges with four equivalent Co(1)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Co(2) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Co(3) and two equivalent Co(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Ni(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Co(1) and one Ni(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Co(1), one Co(3), and one Ni(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one Ni(1) atom. is represented by the CIF card [CIF]
data_Co3NiO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.605
_cell_length_b   5.628
_cell_length_c   5.644
_cell_angle_alpha   90.202
_cell_angle_beta   119.742
_cell_angle_gamma   119.844
_symmetry_Int_Tables_number   1
_cell_volume   126.446
_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
  Co  Co0  1  0.000  1.000  0.500  1.0
  Co  Co1  1  0.500  0.000  0.000  1.0
  Co  Co2  1  0.500  0.000  0.500  1.0
  Ni  Ni3  1  0.000  0.500  0.500  1.0
  O  O4  1  0.528  0.792  0.263  1.0
  O  O5  1  0.472  0.208  0.736  1.0
  O  O6  1  0.027  0.762  0.292  1.0
  O  O7  1  0.471  0.764  0.735  1.0
  O  O8  1  0.027  0.764  0.735  1.0
  O  O9  1  0.973  0.236  0.265  1.0
  O  O10  1  0.529  0.236  0.265  1.0
  O  O11  1  0.973  0.238  0.708  1.0
[/CIF]
.