The material described by K2CoF4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a 9-coordinate geometry to four equivalent F(1) and five equivalent F(2) atoms. Co(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form corner-sharing CoF6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(2) is bonded to five equivalent K(1) and one Co(1) atom to form distorted FK5Co octahedra that share corners with five equivalent F(2)K5Co octahedra, corners with twelve equivalent F(1)K4Co2 octahedra, edges with eight equivalent F(2)K5Co octahedra, and faces with four equivalent F(1)K4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second F site, F(1) is bonded to four equivalent K(1) and two equivalent Co(1) atoms to form distorted FK4Co2 octahedra that share corners with two equivalent F(1)K4Co2 octahedra, corners with twelve equivalent F(2)K5Co octahedra, edges with two equivalent F(1)K4Co2 octahedra, faces with four equivalent F(1)K4Co2 octahedra, and faces with four equivalent F(2)K5Co octahedra. The corner-sharing octahedral tilt angles range from 0-57°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2CoF4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.224
_cell_length_b   7.224
_cell_length_c   7.224
_cell_angle_alpha   146.820
_cell_angle_beta   146.820
_cell_angle_gamma   47.630
_symmetry_Int_Tables_number   1
_cell_volume   112.469
_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  0.355  0.355  0.000  1.0
  K  K1  1  0.645  0.645  0.000  1.0
  Co  Co2  1  0.000  0.000  0.000  1.0
  F  F3  1  0.000  0.500  0.500  1.0
  F  F4  1  0.500  0.000  0.500  1.0
  F  F5  1  0.846  0.846  0.000  1.0
  F  F6  1  0.154  0.154  0.000  1.0
[/CIF]
.
The material described by K2CoF4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a 9-coordinate geometry to four equivalent F(1) and five equivalent F(2) atoms. Co(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form corner-sharing CoF6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(2) is bonded to five equivalent K(1) and one Co(1) atom to form distorted FK5Co octahedra that share corners with five equivalent F(2)K5Co octahedra, corners with twelve equivalent F(1)K4Co2 octahedra, edges with eight equivalent F(2)K5Co octahedra, and faces with four equivalent F(1)K4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second F site, F(1) is bonded to four equivalent K(1) and two equivalent Co(1) atoms to form distorted FK4Co2 octahedra that share corners with two equivalent F(1)K4Co2 octahedra, corners with twelve equivalent F(2)K5Co octahedra, edges with two equivalent F(1)K4Co2 octahedra, faces with four equivalent F(1)K4Co2 octahedra, and faces with four equivalent F(2)K5Co octahedra. The corner-sharing octahedral tilt angles range from 0-57°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2CoF4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.224
_cell_length_b   7.224
_cell_length_c   7.224
_cell_angle_alpha   146.820
_cell_angle_beta   146.820
_cell_angle_gamma   47.630
_symmetry_Int_Tables_number   1
_cell_volume   112.469
_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  0.355  0.355  0.000  1.0
  K  K1  1  0.645  0.645  0.000  1.0
  Co  Co2  1  0.000  0.000  0.000  1.0
  F  F3  1  0.000  0.500  0.500  1.0
  F  F4  1  0.500  0.000  0.500  1.0
  F  F5  1  0.846  0.846  0.000  1.0
  F  F6  1  0.154  0.154  0.000  1.0
[/CIF]
.