The structure described by Bi2Sn2O7 crystallizes in the cubic Fd-3m space group. Sn(1) is bonded to six equivalent O(2) atoms to form SnO6 octahedra that share corners with six equivalent Sn(1)O6 octahedra and edges with six equivalent Bi(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. Bi(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted BiO8 hexagonal bipyramids that share edges with six equivalent Bi(1)O8 hexagonal bipyramids and edges with six equivalent Sn(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with four equivalent O(1)Bi4 tetrahedra, corners with twelve equivalent O(2)Sn2Bi2 tetrahedra, and edges with six equivalent O(2)Sn2Bi2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Sn(1) and two equivalent Bi(1) atoms to form distorted OSn2Bi2 tetrahedra that share corners with two equivalent O(1)Bi4 tetrahedra, corners with twelve equivalent O(2)Sn2Bi2 tetrahedra,  an edgeedge with one O(1)Bi4 tetrahedra, and edges with four equivalent O(2)Sn2Bi2 tetrahedra. is represented by the CIF card [CIF]
data_Sn2Bi2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.511
_cell_length_b   7.511
_cell_length_c   7.511
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   299.615
_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
  Sn  Sn0  1  0.625  0.625  0.125  1.0
  Sn  Sn1  1  0.625  0.125  0.625  1.0
  Sn  Sn2  1  0.125  0.625  0.625  1.0
  Sn  Sn3  1  0.625  0.625  0.625  1.0
  Bi  Bi4  1  0.125  0.125  0.625  1.0
  Bi  Bi5  1  0.125  0.625  0.125  1.0
  Bi  Bi6  1  0.625  0.125  0.125  1.0
  Bi  Bi7  1  0.125  0.125  0.125  1.0
  O  O8  1  0.000  0.000  0.000  1.0
  O  O9  1  0.250  0.250  0.250  1.0
  O  O10  1  0.956  0.544  0.956  1.0
  O  O11  1  0.706  0.294  0.706  1.0
  O  O12  1  0.956  0.956  0.544  1.0
  O  O13  1  0.544  0.956  0.956  1.0
  O  O14  1  0.956  0.544  0.544  1.0
  O  O15  1  0.544  0.544  0.956  1.0
  O  O16  1  0.544  0.956  0.544  1.0
  O  O17  1  0.294  0.706  0.706  1.0
  O  O18  1  0.706  0.294  0.294  1.0
  O  O19  1  0.294  0.706  0.294  1.0
  O  O20  1  0.706  0.706  0.294  1.0
  O  O21  1  0.294  0.294  0.706  1.0
[/CIF]
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The structure described by Bi2Sn2O7 crystallizes in the cubic Fd-3m space group. Sn(1) is bonded to six equivalent O(2) atoms to form SnO6 octahedra that share corners with six equivalent Sn(1)O6 octahedra and edges with six equivalent Bi(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. Bi(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted BiO8 hexagonal bipyramids that share edges with six equivalent Bi(1)O8 hexagonal bipyramids and edges with six equivalent Sn(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Bi(1) atoms to form OBi4 tetrahedra that share corners with four equivalent O(1)Bi4 tetrahedra, corners with twelve equivalent O(2)Sn2Bi2 tetrahedra, and edges with six equivalent O(2)Sn2Bi2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Sn(1) and two equivalent Bi(1) atoms to form distorted OSn2Bi2 tetrahedra that share corners with two equivalent O(1)Bi4 tetrahedra, corners with twelve equivalent O(2)Sn2Bi2 tetrahedra,  an edgeedge with one O(1)Bi4 tetrahedra, and edges with four equivalent O(2)Sn2Bi2 tetrahedra. is represented by the CIF card [CIF]
data_Sn2Bi2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.511
_cell_length_b   7.511
_cell_length_c   7.511
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   299.615
_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
  Sn  Sn0  1  0.625  0.625  0.125  1.0
  Sn  Sn1  1  0.625  0.125  0.625  1.0
  Sn  Sn2  1  0.125  0.625  0.625  1.0
  Sn  Sn3  1  0.625  0.625  0.625  1.0
  Bi  Bi4  1  0.125  0.125  0.625  1.0
  Bi  Bi5  1  0.125  0.625  0.125  1.0
  Bi  Bi6  1  0.625  0.125  0.125  1.0
  Bi  Bi7  1  0.125  0.125  0.125  1.0
  O  O8  1  0.000  0.000  0.000  1.0
  O  O9  1  0.250  0.250  0.250  1.0
  O  O10  1  0.956  0.544  0.956  1.0
  O  O11  1  0.706  0.294  0.706  1.0
  O  O12  1  0.956  0.956  0.544  1.0
  O  O13  1  0.544  0.956  0.956  1.0
  O  O14  1  0.956  0.544  0.544  1.0
  O  O15  1  0.544  0.544  0.956  1.0
  O  O16  1  0.544  0.956  0.544  1.0
  O  O17  1  0.294  0.706  0.706  1.0
  O  O18  1  0.706  0.294  0.294  1.0
  O  O19  1  0.294  0.706  0.294  1.0
  O  O20  1  0.706  0.706  0.294  1.0
  O  O21  1  0.294  0.294  0.706  1.0
[/CIF]
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