The crystal structure described by Cd2Nb2O7 crystallizes in the cubic Fd-3m space group. Nb(1) is bonded to six equivalent O(2) atoms to form NbO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 43°. Cd(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Nb(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Cd(1) atoms to form corner-sharing OCd4 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Nb(1) and two equivalent Cd(1) atoms. is represented by the CIF file [CIF]
data_Nb2Cd2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.399
_cell_length_b   7.399
_cell_length_c   7.399
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   286.466
_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
  Nb  Nb0  1  0.125  0.125  0.625  1.0
  Nb  Nb1  1  0.125  0.625  0.125  1.0
  Nb  Nb2  1  0.625  0.125  0.125  1.0
  Nb  Nb3  1  0.125  0.125  0.125  1.0
  Cd  Cd4  1  0.625  0.625  0.125  1.0
  Cd  Cd5  1  0.625  0.125  0.625  1.0
  Cd  Cd6  1  0.125  0.625  0.625  1.0
  Cd  Cd7  1  0.625  0.625  0.625  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  0.056  0.444  0.056  1.0
  O  O11  1  0.806  0.194  0.806  1.0
  O  O12  1  0.056  0.056  0.444  1.0
  O  O13  1  0.444  0.056  0.056  1.0
  O  O14  1  0.056  0.444  0.444  1.0
  O  O15  1  0.444  0.444  0.056  1.0
  O  O16  1  0.444  0.056  0.444  1.0
  O  O17  1  0.194  0.806  0.806  1.0
  O  O18  1  0.806  0.194  0.194  1.0
  O  O19  1  0.194  0.806  0.194  1.0
  O  O20  1  0.806  0.806  0.194  1.0
  O  O21  1  0.194  0.194  0.806  1.0
[/CIF]
.
The crystal structure described by Cd2Nb2O7 crystallizes in the cubic Fd-3m space group. Nb(1) is bonded to six equivalent O(2) atoms to form NbO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 43°. Cd(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Nb(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Cd(1) atoms to form corner-sharing OCd4 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Nb(1) and two equivalent Cd(1) atoms. is represented by the CIF file [CIF]
data_Nb2Cd2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.399
_cell_length_b   7.399
_cell_length_c   7.399
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   286.466
_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
  Nb  Nb0  1  0.125  0.125  0.625  1.0
  Nb  Nb1  1  0.125  0.625  0.125  1.0
  Nb  Nb2  1  0.625  0.125  0.125  1.0
  Nb  Nb3  1  0.125  0.125  0.125  1.0
  Cd  Cd4  1  0.625  0.625  0.125  1.0
  Cd  Cd5  1  0.625  0.125  0.625  1.0
  Cd  Cd6  1  0.125  0.625  0.625  1.0
  Cd  Cd7  1  0.625  0.625  0.625  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  0.056  0.444  0.056  1.0
  O  O11  1  0.806  0.194  0.806  1.0
  O  O12  1  0.056  0.056  0.444  1.0
  O  O13  1  0.444  0.056  0.056  1.0
  O  O14  1  0.056  0.444  0.444  1.0
  O  O15  1  0.444  0.444  0.056  1.0
  O  O16  1  0.444  0.056  0.444  1.0
  O  O17  1  0.194  0.806  0.806  1.0
  O  O18  1  0.806  0.194  0.194  1.0
  O  O19  1  0.194  0.806  0.194  1.0
  O  O20  1  0.806  0.806  0.194  1.0
  O  O21  1  0.194  0.194  0.806  1.0
[/CIF]
.