The compound described by Rb2K4Co2O5 crystallizes in the tetragonal P4_2/mnm space group. Rb(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent O(2) atoms to form distorted corner-sharing KO4 tetrahedra. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. Co(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to two equivalent Rb(1), two equivalent K(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent K(1), two equivalent K(2), and one Co(1) atom. is represented by the CIF file [CIF]
data_K4Rb2Co2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.702
_cell_length_b   6.702
_cell_length_c   11.675
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   524.411
_cell_formula_units_Z   2
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  0.500  0.000  0.250  1.0
  K  K1  1  0.500  0.000  0.750  1.0
  K  K2  1  0.000  0.000  0.779  1.0
  K  K3  1  0.500  0.500  0.279  1.0
  K  K4  1  0.500  0.500  0.721  1.0
  K  K5  1  0.000  0.000  0.221  1.0
  K  K6  1  0.000  0.500  0.250  1.0
  K  K7  1  0.000  0.500  0.750  1.0
  Rb  Rb8  1  0.312  0.312  0.000  1.0
  Rb  Rb9  1  0.188  0.812  0.500  1.0
  Rb  Rb10  1  0.812  0.188  0.500  1.0
  Rb  Rb11  1  0.688  0.688  0.000  1.0
  Co  Co12  1  0.206  0.794  0.000  1.0
  Co  Co13  1  0.706  0.706  0.500  1.0
  Co  Co14  1  0.294  0.294  0.500  1.0
  Co  Co15  1  0.794  0.206  0.000  1.0
  O  O16  1  0.500  0.500  0.500  1.0
  O  O17  1  0.000  0.000  0.000  1.0
  O  O18  1  0.782  0.782  0.359  1.0
  O  O19  1  0.218  0.218  0.359  1.0
  O  O20  1  0.782  0.782  0.641  1.0
  O  O21  1  0.282  0.718  0.859  1.0
  O  O22  1  0.718  0.282  0.859  1.0
  O  O23  1  0.718  0.282  0.141  1.0
  O  O24  1  0.218  0.218  0.641  1.0
  O  O25  1  0.282  0.718  0.141  1.0
[/CIF]
.
The compound described by Rb2K4Co2O5 crystallizes in the tetragonal P4_2/mnm space group. Rb(1) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent O(2) atoms to form distorted corner-sharing KO4 tetrahedra. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1) and four equivalent O(2) atoms. Co(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to two equivalent Rb(1), two equivalent K(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent K(1), two equivalent K(2), and one Co(1) atom. is represented by the CIF file [CIF]
data_K4Rb2Co2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.702
_cell_length_b   6.702
_cell_length_c   11.675
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   524.411
_cell_formula_units_Z   2
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  0.500  0.000  0.250  1.0
  K  K1  1  0.500  0.000  0.750  1.0
  K  K2  1  0.000  0.000  0.779  1.0
  K  K3  1  0.500  0.500  0.279  1.0
  K  K4  1  0.500  0.500  0.721  1.0
  K  K5  1  0.000  0.000  0.221  1.0
  K  K6  1  0.000  0.500  0.250  1.0
  K  K7  1  0.000  0.500  0.750  1.0
  Rb  Rb8  1  0.312  0.312  0.000  1.0
  Rb  Rb9  1  0.188  0.812  0.500  1.0
  Rb  Rb10  1  0.812  0.188  0.500  1.0
  Rb  Rb11  1  0.688  0.688  0.000  1.0
  Co  Co12  1  0.206  0.794  0.000  1.0
  Co  Co13  1  0.706  0.706  0.500  1.0
  Co  Co14  1  0.294  0.294  0.500  1.0
  Co  Co15  1  0.794  0.206  0.000  1.0
  O  O16  1  0.500  0.500  0.500  1.0
  O  O17  1  0.000  0.000  0.000  1.0
  O  O18  1  0.782  0.782  0.359  1.0
  O  O19  1  0.218  0.218  0.359  1.0
  O  O20  1  0.782  0.782  0.641  1.0
  O  O21  1  0.282  0.718  0.859  1.0
  O  O22  1  0.718  0.282  0.859  1.0
  O  O23  1  0.718  0.282  0.141  1.0
  O  O24  1  0.218  0.218  0.641  1.0
  O  O25  1  0.282  0.718  0.141  1.0
[/CIF]
.