The compound described by Y2Co2O7 crystallizes in the cubic Fd-3m space group. Y(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted YO8 hexagonal bipyramids that share edges with six equivalent Y(1)O8 hexagonal bipyramids and edges with six equivalent Co(1)O6 octahedra. Co(1) is bonded to six equivalent O(2) atoms to form CoO6 octahedra that share corners with six equivalent Co(1)O6 octahedra and edges with six equivalent Y(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 48°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Y(1) atoms to form OY4 tetrahedra that share corners with four equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Co2 tetrahedra, and edges with six equivalent O(2)Y2Co2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Co(1) atoms to form distorted OY2Co2 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Co2 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with four equivalent O(2)Y2Co2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Co2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.011
_cell_length_b   7.011
_cell_length_c   7.011
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   243.669
_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
  Y  Y0  1  0.625  0.625  0.125  1.0
  Y  Y1  1  0.625  0.125  0.625  1.0
  Y  Y2  1  0.125  0.625  0.625  1.0
  Y  Y3  1  0.625  0.625  0.625  1.0
  Co  Co4  1  0.125  0.125  0.625  1.0
  Co  Co5  1  0.125  0.625  0.125  1.0
  Co  Co6  1  0.625  0.125  0.125  1.0
  Co  Co7  1  0.125  0.125  0.125  1.0
  O  O8  1  0.750  0.750  0.750  1.0
  O  O9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.047  0.453  0.047  1.0
  O  O11  1  0.797  0.203  0.797  1.0
  O  O12  1  0.047  0.047  0.453  1.0
  O  O13  1  0.453  0.047  0.047  1.0
  O  O14  1  0.047  0.453  0.453  1.0
  O  O15  1  0.453  0.453  0.047  1.0
  O  O16  1  0.453  0.047  0.453  1.0
  O  O17  1  0.203  0.797  0.797  1.0
  O  O18  1  0.797  0.203  0.203  1.0
  O  O19  1  0.203  0.797  0.203  1.0
  O  O20  1  0.797  0.797  0.203  1.0
  O  O21  1  0.203  0.203  0.797  1.0
[/CIF]
.
The compound described by Y2Co2O7 crystallizes in the cubic Fd-3m space group. Y(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted YO8 hexagonal bipyramids that share edges with six equivalent Y(1)O8 hexagonal bipyramids and edges with six equivalent Co(1)O6 octahedra. Co(1) is bonded to six equivalent O(2) atoms to form CoO6 octahedra that share corners with six equivalent Co(1)O6 octahedra and edges with six equivalent Y(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 48°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Y(1) atoms to form OY4 tetrahedra that share corners with four equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Co2 tetrahedra, and edges with six equivalent O(2)Y2Co2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Co(1) atoms to form distorted OY2Co2 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Co2 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with four equivalent O(2)Y2Co2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Co2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.011
_cell_length_b   7.011
_cell_length_c   7.011
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   243.669
_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
  Y  Y0  1  0.625  0.625  0.125  1.0
  Y  Y1  1  0.625  0.125  0.625  1.0
  Y  Y2  1  0.125  0.625  0.625  1.0
  Y  Y3  1  0.625  0.625  0.625  1.0
  Co  Co4  1  0.125  0.125  0.625  1.0
  Co  Co5  1  0.125  0.625  0.125  1.0
  Co  Co6  1  0.625  0.125  0.125  1.0
  Co  Co7  1  0.125  0.125  0.125  1.0
  O  O8  1  0.750  0.750  0.750  1.0
  O  O9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.047  0.453  0.047  1.0
  O  O11  1  0.797  0.203  0.797  1.0
  O  O12  1  0.047  0.047  0.453  1.0
  O  O13  1  0.453  0.047  0.047  1.0
  O  O14  1  0.047  0.453  0.453  1.0
  O  O15  1  0.453  0.453  0.047  1.0
  O  O16  1  0.453  0.047  0.453  1.0
  O  O17  1  0.203  0.797  0.797  1.0
  O  O18  1  0.797  0.203  0.203  1.0
  O  O19  1  0.203  0.797  0.203  1.0
  O  O20  1  0.797  0.797  0.203  1.0
  O  O21  1  0.203  0.203  0.797  1.0
[/CIF]
.