The crystal structure described by Cd2Ta2O7 crystallizes in the cubic Fd-3m space group. Ta(1) is bonded to six equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 42°. Cd(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Ta(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ta(1) and two equivalent Cd(1) atoms. In the second O site, O(2) is bonded to four equivalent Cd(1) atoms to form corner-sharing OCd4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta2Cd2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.361
_cell_length_b   7.361
_cell_length_c   7.361
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   281.984
_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
  Ta  Ta0  1  0.625  0.625  0.625  1.0
  Ta  Ta1  1  0.125  0.625  0.625  1.0
  Ta  Ta2  1  0.625  0.625  0.125  1.0
  Ta  Ta3  1  0.625  0.125  0.625  1.0
  Cd  Cd4  1  0.125  0.125  0.125  1.0
  Cd  Cd5  1  0.625  0.125  0.125  1.0
  Cd  Cd6  1  0.125  0.125  0.625  1.0
  Cd  Cd7  1  0.125  0.625  0.125  1.0
  O  O8  1  0.557  0.557  0.943  1.0
  O  O9  1  0.307  0.307  0.693  1.0
  O  O10  1  0.943  0.557  0.943  1.0
  O  O11  1  0.943  0.557  0.557  1.0
  O  O12  1  0.557  0.943  0.943  1.0
  O  O13  1  0.557  0.943  0.557  1.0
  O  O14  1  0.307  0.693  0.307  1.0
  O  O15  1  0.693  0.307  0.693  1.0
  O  O16  1  0.250  0.250  0.250  1.0
  O  O17  1  0.000  0.000  0.000  1.0
  O  O18  1  0.943  0.943  0.557  1.0
  O  O19  1  0.693  0.307  0.307  1.0
  O  O20  1  0.307  0.693  0.693  1.0
  O  O21  1  0.693  0.693  0.307  1.0
[/CIF]
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The crystal structure described by Cd2Ta2O7 crystallizes in the cubic Fd-3m space group. Ta(1) is bonded to six equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 42°. Cd(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Ta(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ta(1) and two equivalent Cd(1) atoms. In the second O site, O(2) is bonded to four equivalent Cd(1) atoms to form corner-sharing OCd4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta2Cd2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.361
_cell_length_b   7.361
_cell_length_c   7.361
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   281.984
_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
  Ta  Ta0  1  0.625  0.625  0.625  1.0
  Ta  Ta1  1  0.125  0.625  0.625  1.0
  Ta  Ta2  1  0.625  0.625  0.125  1.0
  Ta  Ta3  1  0.625  0.125  0.625  1.0
  Cd  Cd4  1  0.125  0.125  0.125  1.0
  Cd  Cd5  1  0.625  0.125  0.125  1.0
  Cd  Cd6  1  0.125  0.125  0.625  1.0
  Cd  Cd7  1  0.125  0.625  0.125  1.0
  O  O8  1  0.557  0.557  0.943  1.0
  O  O9  1  0.307  0.307  0.693  1.0
  O  O10  1  0.943  0.557  0.943  1.0
  O  O11  1  0.943  0.557  0.557  1.0
  O  O12  1  0.557  0.943  0.943  1.0
  O  O13  1  0.557  0.943  0.557  1.0
  O  O14  1  0.307  0.693  0.307  1.0
  O  O15  1  0.693  0.307  0.693  1.0
  O  O16  1  0.250  0.250  0.250  1.0
  O  O17  1  0.000  0.000  0.000  1.0
  O  O18  1  0.943  0.943  0.557  1.0
  O  O19  1  0.693  0.307  0.307  1.0
  O  O20  1  0.307  0.693  0.693  1.0
  O  O21  1  0.693  0.693  0.307  1.0
[/CIF]
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