The structure described by K2Mg(CoO2)2 crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. Mg(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form MgO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra and edges with two equivalent Co(1)O4 tetrahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form CoO4 tetrahedra that share corners with two equivalent Co(1)O4 tetrahedra and edges with two equivalent Mg(1)O4 tetrahedra. In the second Co site, Co(2) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one K(1), two equivalent K(2), one Co(1), and one Co(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent K(2), one Mg(1), and two equivalent Co(2) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), one Mg(1), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent Mg(1), and one Co(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Mg(CoO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.663
_cell_length_b   7.663
_cell_length_c   7.082
_cell_angle_alpha   57.217
_cell_angle_beta   122.783
_cell_angle_gamma   154.433
_symmetry_Int_Tables_number   1
_cell_volume   149.255
_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  0.237  0.763  0.760  1.0
  K  K1  1  0.737  0.263  0.255  1.0
  Mg  Mg2  1  0.445  0.555  0.328  1.0
  Co  Co3  1  0.040  0.960  0.191  1.0
  Co  Co4  1  0.972  0.028  0.719  1.0
  O  O5  1  0.094  0.906  0.995  1.0
  O  O6  1  0.406  0.594  0.556  1.0
  O  O7  1  0.594  0.406  0.388  1.0
  O  O8  1  0.892  0.108  0.147  1.0
[/CIF]
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The structure described by K2Mg(CoO2)2 crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. Mg(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form MgO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra and edges with two equivalent Co(1)O4 tetrahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form CoO4 tetrahedra that share corners with two equivalent Co(1)O4 tetrahedra and edges with two equivalent Mg(1)O4 tetrahedra. In the second Co site, Co(2) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one K(1), two equivalent K(2), one Co(1), and one Co(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent K(2), one Mg(1), and two equivalent Co(2) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), one Mg(1), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent Mg(1), and one Co(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Mg(CoO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.663
_cell_length_b   7.663
_cell_length_c   7.082
_cell_angle_alpha   57.217
_cell_angle_beta   122.783
_cell_angle_gamma   154.433
_symmetry_Int_Tables_number   1
_cell_volume   149.255
_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  0.237  0.763  0.760  1.0
  K  K1  1  0.737  0.263  0.255  1.0
  Mg  Mg2  1  0.445  0.555  0.328  1.0
  Co  Co3  1  0.040  0.960  0.191  1.0
  Co  Co4  1  0.972  0.028  0.719  1.0
  O  O5  1  0.094  0.906  0.995  1.0
  O  O6  1  0.406  0.594  0.556  1.0
  O  O7  1  0.594  0.406  0.388  1.0
  O  O8  1  0.892  0.108  0.147  1.0
[/CIF]
.