The crystal structure described by Ca2Nb2SnO8 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Sn(1) is bonded in a see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Sn(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Nb(1) and one Sn(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Ca(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Ca(1) and one Nb(1) atom to form a mixture of distorted edge and corner-sharing OCa3Nb trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2Nb2SnO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.683
_cell_length_b   10.683
_cell_length_c   5.513
_cell_angle_alpha   88.089
_cell_angle_beta   88.089
_cell_angle_gamma   37.591
_symmetry_Int_Tables_number   1
_cell_volume   383.555
_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
  Ca  Ca0  1  0.566  0.865  0.256  1.0
  Ca  Ca1  1  0.135  0.434  0.244  1.0
  Ca  Ca2  1  0.434  0.135  0.744  1.0
  Ca  Ca3  1  0.865  0.566  0.756  1.0
  Nb  Nb4  1  0.729  0.023  0.251  1.0
  Nb  Nb5  1  0.977  0.271  0.249  1.0
  Nb  Nb6  1  0.271  0.977  0.749  1.0
  Nb  Nb7  1  0.023  0.729  0.751  1.0
  Sn  Sn8  1  0.301  0.699  0.250  1.0
  Sn  Sn9  1  0.699  0.301  0.750  1.0
  O  O10  1  0.825  0.021  0.923  1.0
  O  O11  1  0.979  0.175  0.577  1.0
  O  O12  1  0.175  0.979  0.077  1.0
  O  O13  1  0.021  0.825  0.423  1.0
  O  O14  1  0.608  0.251  0.401  1.0
  O  O15  1  0.749  0.392  0.099  1.0
  O  O16  1  0.392  0.749  0.599  1.0
  O  O17  1  0.251  0.608  0.901  1.0
  O  O18  1  0.731  0.888  0.518  1.0
  O  O19  1  0.112  0.269  0.982  1.0
  O  O20  1  0.144  0.477  0.639  1.0
  O  O21  1  0.523  0.856  0.861  1.0
  O  O22  1  0.856  0.523  0.361  1.0
  O  O23  1  0.477  0.144  0.139  1.0
  O  O24  1  0.888  0.731  0.018  1.0
  O  O25  1  0.269  0.112  0.482  1.0
[/CIF]
.
The crystal structure described by Ca2Nb2SnO8 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Sn(1) is bonded in a see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Sn(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Nb(1) and one Sn(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Ca(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Ca(1) and one Nb(1) atom to form a mixture of distorted edge and corner-sharing OCa3Nb trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2Nb2SnO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.683
_cell_length_b   10.683
_cell_length_c   5.513
_cell_angle_alpha   88.089
_cell_angle_beta   88.089
_cell_angle_gamma   37.591
_symmetry_Int_Tables_number   1
_cell_volume   383.555
_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
  Ca  Ca0  1  0.566  0.865  0.256  1.0
  Ca  Ca1  1  0.135  0.434  0.244  1.0
  Ca  Ca2  1  0.434  0.135  0.744  1.0
  Ca  Ca3  1  0.865  0.566  0.756  1.0
  Nb  Nb4  1  0.729  0.023  0.251  1.0
  Nb  Nb5  1  0.977  0.271  0.249  1.0
  Nb  Nb6  1  0.271  0.977  0.749  1.0
  Nb  Nb7  1  0.023  0.729  0.751  1.0
  Sn  Sn8  1  0.301  0.699  0.250  1.0
  Sn  Sn9  1  0.699  0.301  0.750  1.0
  O  O10  1  0.825  0.021  0.923  1.0
  O  O11  1  0.979  0.175  0.577  1.0
  O  O12  1  0.175  0.979  0.077  1.0
  O  O13  1  0.021  0.825  0.423  1.0
  O  O14  1  0.608  0.251  0.401  1.0
  O  O15  1  0.749  0.392  0.099  1.0
  O  O16  1  0.392  0.749  0.599  1.0
  O  O17  1  0.251  0.608  0.901  1.0
  O  O18  1  0.731  0.888  0.518  1.0
  O  O19  1  0.112  0.269  0.982  1.0
  O  O20  1  0.144  0.477  0.639  1.0
  O  O21  1  0.523  0.856  0.861  1.0
  O  O22  1  0.856  0.523  0.361  1.0
  O  O23  1  0.477  0.144  0.139  1.0
  O  O24  1  0.888  0.731  0.018  1.0
  O  O25  1  0.269  0.112  0.482  1.0
[/CIF]
.