The compound described by Os2Bi2O7 crystallizes in the cubic Fd-3m space group. Os(1) is bonded to six equivalent O(1) atoms to form OsO6 octahedra that share corners with six equivalent Os(1)O6 octahedra and edges with six equivalent Bi(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 48°. Bi(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted BiO8 hexagonal bipyramids that share edges with six equivalent Bi(1)O8 hexagonal bipyramids and edges with six equivalent Os(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Os(1) and two equivalent Bi(1) atoms to form distorted OBi2Os2 tetrahedra that share corners with two equivalent O(2)Bi4 tetrahedra, corners with twelve equivalent O(1)Bi2Os2 tetrahedra,  an edgeedge with one O(2)Bi4 tetrahedra, and edges with four equivalent O(1)Bi2Os2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with four equivalent O(2)Bi4 tetrahedra, corners with twelve equivalent O(1)Bi2Os2 tetrahedra, and edges with six equivalent O(1)Bi2Os2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Bi2Os2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.325
_cell_length_b   7.325
_cell_length_c   7.325
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   277.945
_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
  Bi  Bi0  1  0.125  0.625  0.125  1.0
  Bi  Bi1  1  0.125  0.125  0.625  1.0
  Bi  Bi2  1  0.625  0.125  0.125  1.0
  Bi  Bi3  1  0.125  0.125  0.125  1.0
  Os  Os4  1  0.625  0.625  0.125  1.0
  Os  Os5  1  0.625  0.125  0.625  1.0
  Os  Os6  1  0.625  0.625  0.625  1.0
  Os  Os7  1  0.125  0.625  0.625  1.0
  O  O8  1  0.297  0.703  0.703  1.0
  O  O9  1  0.297  0.703  0.297  1.0
  O  O10  1  0.547  0.953  0.547  1.0
  O  O11  1  0.297  0.297  0.703  1.0
  O  O12  1  0.250  0.250  0.250  1.0
  O  O13  1  0.703  0.703  0.297  1.0
  O  O14  1  0.953  0.953  0.547  1.0
  O  O15  1  0.703  0.297  0.297  1.0
  O  O16  1  0.953  0.547  0.547  1.0
  O  O17  1  0.000  0.000  0.000  1.0
  O  O18  1  0.547  0.953  0.953  1.0
  O  O19  1  0.953  0.547  0.953  1.0
  O  O20  1  0.703  0.297  0.703  1.0
  O  O21  1  0.547  0.547  0.953  1.0
[/CIF]
.
The compound described by Os2Bi2O7 crystallizes in the cubic Fd-3m space group. Os(1) is bonded to six equivalent O(1) atoms to form OsO6 octahedra that share corners with six equivalent Os(1)O6 octahedra and edges with six equivalent Bi(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 48°. Bi(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted BiO8 hexagonal bipyramids that share edges with six equivalent Bi(1)O8 hexagonal bipyramids and edges with six equivalent Os(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Os(1) and two equivalent Bi(1) atoms to form distorted OBi2Os2 tetrahedra that share corners with two equivalent O(2)Bi4 tetrahedra, corners with twelve equivalent O(1)Bi2Os2 tetrahedra,  an edgeedge with one O(2)Bi4 tetrahedra, and edges with four equivalent O(1)Bi2Os2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with four equivalent O(2)Bi4 tetrahedra, corners with twelve equivalent O(1)Bi2Os2 tetrahedra, and edges with six equivalent O(1)Bi2Os2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Bi2Os2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.325
_cell_length_b   7.325
_cell_length_c   7.325
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   277.945
_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
  Bi  Bi0  1  0.125  0.625  0.125  1.0
  Bi  Bi1  1  0.125  0.125  0.625  1.0
  Bi  Bi2  1  0.625  0.125  0.125  1.0
  Bi  Bi3  1  0.125  0.125  0.125  1.0
  Os  Os4  1  0.625  0.625  0.125  1.0
  Os  Os5  1  0.625  0.125  0.625  1.0
  Os  Os6  1  0.625  0.625  0.625  1.0
  Os  Os7  1  0.125  0.625  0.625  1.0
  O  O8  1  0.297  0.703  0.703  1.0
  O  O9  1  0.297  0.703  0.297  1.0
  O  O10  1  0.547  0.953  0.547  1.0
  O  O11  1  0.297  0.297  0.703  1.0
  O  O12  1  0.250  0.250  0.250  1.0
  O  O13  1  0.703  0.703  0.297  1.0
  O  O14  1  0.953  0.953  0.547  1.0
  O  O15  1  0.703  0.297  0.297  1.0
  O  O16  1  0.953  0.547  0.547  1.0
  O  O17  1  0.000  0.000  0.000  1.0
  O  O18  1  0.547  0.953  0.953  1.0
  O  O19  1  0.953  0.547  0.953  1.0
  O  O20  1  0.703  0.297  0.703  1.0
  O  O21  1  0.547  0.547  0.953  1.0
[/CIF]
.