The compound described by Ca(Sn2O3)2 crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form SnO5 square pyramids that share corners with four equivalent Sn(2)O6 octahedra, corners with two equivalent Sn(1)O5 square pyramids, edges with three equivalent Sn(2)O6 octahedra, and edges with three equivalent Sn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 25-84°. In the second Sn site, Sn(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted SnO6 octahedra that share corners with two equivalent Sn(2)O6 octahedra, corners with four equivalent Sn(1)O5 square pyramids, edges with two equivalent Sn(2)O6 octahedra, and edges with three equivalent Sn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-43°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sn(2) and four equivalent Sn(1) atoms to form OSn6 octahedra that share corners with eight equivalent O(3)CaSn4 square pyramids, corners with two equivalent O(4)Ca2Sn2 trigonal pyramids, edges with two equivalent O(1)Sn6 octahedra, edges with two equivalent O(3)CaSn4 square pyramids, and edges with four equivalent O(2)Ca2Sn3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ca(1), one Sn(1), and two equivalent Sn(2) atoms to form distorted OCa2Sn3 trigonal bipyramids that share corners with four equivalent O(3)CaSn4 square pyramids, corners with two equivalent O(2)Ca2Sn3 trigonal bipyramids, corners with four equivalent O(4)Ca2Sn2 trigonal pyramids, edges with two equivalent O(1)Sn6 octahedra, edges with three equivalent O(3)CaSn4 square pyramids, edges with three equivalent O(2)Ca2Sn3 trigonal bipyramids, and  an edgeedge with one O(4)Ca2Sn2 trigonal pyramid. In the third O site, O(3) is bonded to one Ca(1), two equivalent Sn(1), and two equivalent Sn(2) atoms to form distorted OCaSn4 square pyramids that share corners with four equivalent O(1)Sn6 octahedra,  a cornercorner with one O(3)CaSn4 square pyramid, corners with four equivalent O(2)Ca2Sn3 trigonal bipyramids,  an edgeedge with one O(1)Sn6 octahedra, edges with two equivalent O(3)CaSn4 square pyramids, edges with three equivalent O(2)Ca2Sn3 trigonal bipyramids, and edges with two equivalent O(4)Ca2Sn2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 9-81°. In the fourth O site, O(4) is bonded to two equivalent Ca(1) and two equivalent Sn(2) atoms to form distorted OCa2Sn2 trigonal pyramids that share corners with two equivalent O(1)Sn6 octahedra, corners with eight equivalent O(2)Ca2Sn3 trigonal bipyramids, corners with two equivalent O(4)Ca2Sn2 trigonal pyramids, edges with four equivalent O(3)CaSn4 square pyramids, and edges with two equivalent O(2)Ca2Sn3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 1°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca(Sn2O3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.742
_cell_length_b   5.742
_cell_length_c   17.659
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   145.564
_symmetry_Int_Tables_number   1
_cell_volume   329.216
_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  0.323  0.677  0.750  1.0
  Ca  Ca1  1  0.677  0.323  0.250  1.0
  Sn  Sn2  1  0.143  0.857  0.054  1.0
  Sn  Sn3  1  0.596  0.404  0.640  1.0
  Sn  Sn4  1  0.857  0.143  0.946  1.0
  Sn  Sn5  1  0.404  0.596  0.360  1.0
  Sn  Sn6  1  0.143  0.857  0.446  1.0
  Sn  Sn7  1  0.857  0.143  0.554  1.0
  Sn  Sn8  1  0.404  0.596  0.140  1.0
  Sn  Sn9  1  0.596  0.404  0.860  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.956  0.044  0.837  1.0
  O  O13  1  0.044  0.956  0.163  1.0
  O  O14  1  0.044  0.956  0.337  1.0
  O  O15  1  0.956  0.044  0.663  1.0
  O  O16  1  0.232  0.768  0.873  1.0
  O  O17  1  0.768  0.232  0.127  1.0
  O  O18  1  0.768  0.232  0.373  1.0
  O  O19  1  0.232  0.768  0.627  1.0
  O  O20  1  0.666  0.334  0.750  1.0
  O  O21  1  0.334  0.666  0.250  1.0
[/CIF]
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The compound described by Ca(Sn2O3)2 crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form SnO5 square pyramids that share corners with four equivalent Sn(2)O6 octahedra, corners with two equivalent Sn(1)O5 square pyramids, edges with three equivalent Sn(2)O6 octahedra, and edges with three equivalent Sn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 25-84°. In the second Sn site, Sn(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted SnO6 octahedra that share corners with two equivalent Sn(2)O6 octahedra, corners with four equivalent Sn(1)O5 square pyramids, edges with two equivalent Sn(2)O6 octahedra, and edges with three equivalent Sn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-43°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sn(2) and four equivalent Sn(1) atoms to form OSn6 octahedra that share corners with eight equivalent O(3)CaSn4 square pyramids, corners with two equivalent O(4)Ca2Sn2 trigonal pyramids, edges with two equivalent O(1)Sn6 octahedra, edges with two equivalent O(3)CaSn4 square pyramids, and edges with four equivalent O(2)Ca2Sn3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ca(1), one Sn(1), and two equivalent Sn(2) atoms to form distorted OCa2Sn3 trigonal bipyramids that share corners with four equivalent O(3)CaSn4 square pyramids, corners with two equivalent O(2)Ca2Sn3 trigonal bipyramids, corners with four equivalent O(4)Ca2Sn2 trigonal pyramids, edges with two equivalent O(1)Sn6 octahedra, edges with three equivalent O(3)CaSn4 square pyramids, edges with three equivalent O(2)Ca2Sn3 trigonal bipyramids, and  an edgeedge with one O(4)Ca2Sn2 trigonal pyramid. In the third O site, O(3) is bonded to one Ca(1), two equivalent Sn(1), and two equivalent Sn(2) atoms to form distorted OCaSn4 square pyramids that share corners with four equivalent O(1)Sn6 octahedra,  a cornercorner with one O(3)CaSn4 square pyramid, corners with four equivalent O(2)Ca2Sn3 trigonal bipyramids,  an edgeedge with one O(1)Sn6 octahedra, edges with two equivalent O(3)CaSn4 square pyramids, edges with three equivalent O(2)Ca2Sn3 trigonal bipyramids, and edges with two equivalent O(4)Ca2Sn2 trigonal pyramids. The corner-sharing octahedral tilt angles range from 9-81°. In the fourth O site, O(4) is bonded to two equivalent Ca(1) and two equivalent Sn(2) atoms to form distorted OCa2Sn2 trigonal pyramids that share corners with two equivalent O(1)Sn6 octahedra, corners with eight equivalent O(2)Ca2Sn3 trigonal bipyramids, corners with two equivalent O(4)Ca2Sn2 trigonal pyramids, edges with four equivalent O(3)CaSn4 square pyramids, and edges with two equivalent O(2)Ca2Sn3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 1°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca(Sn2O3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.742
_cell_length_b   5.742
_cell_length_c   17.659
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   145.564
_symmetry_Int_Tables_number   1
_cell_volume   329.216
_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  0.323  0.677  0.750  1.0
  Ca  Ca1  1  0.677  0.323  0.250  1.0
  Sn  Sn2  1  0.143  0.857  0.054  1.0
  Sn  Sn3  1  0.596  0.404  0.640  1.0
  Sn  Sn4  1  0.857  0.143  0.946  1.0
  Sn  Sn5  1  0.404  0.596  0.360  1.0
  Sn  Sn6  1  0.143  0.857  0.446  1.0
  Sn  Sn7  1  0.857  0.143  0.554  1.0
  Sn  Sn8  1  0.404  0.596  0.140  1.0
  Sn  Sn9  1  0.596  0.404  0.860  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.956  0.044  0.837  1.0
  O  O13  1  0.044  0.956  0.163  1.0
  O  O14  1  0.044  0.956  0.337  1.0
  O  O15  1  0.956  0.044  0.663  1.0
  O  O16  1  0.232  0.768  0.873  1.0
  O  O17  1  0.768  0.232  0.127  1.0
  O  O18  1  0.768  0.232  0.373  1.0
  O  O19  1  0.232  0.768  0.627  1.0
  O  O20  1  0.666  0.334  0.750  1.0
  O  O21  1  0.334  0.666  0.250  1.0
[/CIF]
.