The crystal structure described by FeCo2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. Fe(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with six equivalent Co(2)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Co(2)O4 tetrahedra, edges with two equivalent Co(1)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CoO4 tetrahedra that share corners with six equivalent Fe(1)O6 octahedra and corners with six equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Co(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Fe(1), one Co(1), and one Co(2) atom. is represented by the CIF card [CIF]
data_Fe(CoO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.829
_cell_length_b   5.829
_cell_length_c   5.829
_cell_angle_alpha   60.316
_cell_angle_beta   90.230
_cell_angle_gamma   120.585
_symmetry_Int_Tables_number   1
_cell_volume   139.737
_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
  Fe  Fe0  1  0.500  0.000  1.000  1.0
  Fe  Fe1  1  0.500  0.500  0.500  1.0
  Co  Co2  1  0.500  0.000  0.500  1.0
  Co  Co3  1  0.126  0.250  0.124  1.0
  Co  Co4  1  0.874  0.750  0.876  1.0
  Co  Co5  1  0.000  0.500  0.500  1.0
  O  O6  1  0.745  0.471  0.284  1.0
  O  O7  1  0.745  0.029  0.725  1.0
  O  O8  1  0.753  0.486  0.733  1.0
  O  O9  1  0.281  0.014  0.733  1.0
  O  O10  1  0.719  0.986  0.267  1.0
  O  O11  1  0.247  0.514  0.267  1.0
  O  O12  1  0.255  0.971  0.275  1.0
  O  O13  1  0.255  0.529  0.716  1.0
[/CIF]
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The crystal structure described by FeCo2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. Fe(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with six equivalent Co(2)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Co(1)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Co(2)O4 tetrahedra, edges with two equivalent Co(1)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CoO4 tetrahedra that share corners with six equivalent Fe(1)O6 octahedra and corners with six equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Co(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Fe(1), one Co(1), and one Co(2) atom. is represented by the CIF card [CIF]
data_Fe(CoO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.829
_cell_length_b   5.829
_cell_length_c   5.829
_cell_angle_alpha   60.316
_cell_angle_beta   90.230
_cell_angle_gamma   120.585
_symmetry_Int_Tables_number   1
_cell_volume   139.737
_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
  Fe  Fe0  1  0.500  0.000  1.000  1.0
  Fe  Fe1  1  0.500  0.500  0.500  1.0
  Co  Co2  1  0.500  0.000  0.500  1.0
  Co  Co3  1  0.126  0.250  0.124  1.0
  Co  Co4  1  0.874  0.750  0.876  1.0
  Co  Co5  1  0.000  0.500  0.500  1.0
  O  O6  1  0.745  0.471  0.284  1.0
  O  O7  1  0.745  0.029  0.725  1.0
  O  O8  1  0.753  0.486  0.733  1.0
  O  O9  1  0.281  0.014  0.733  1.0
  O  O10  1  0.719  0.986  0.267  1.0
  O  O11  1  0.247  0.514  0.267  1.0
  O  O12  1  0.255  0.971  0.275  1.0
  O  O13  1  0.255  0.529  0.716  1.0
[/CIF]
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