The structure described by K2Sn2O3 crystallizes in the trigonal R-3m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent Sn(1) and six equivalent O(1) atoms to form distorted KSn2O6 hexagonal bipyramids that share corners with six equivalent K(1)Sn2O6 hexagonal bipyramids and corners with six equivalent O(1)K4Sn2 octahedra. The corner-sharing octahedral tilt angles are 58°. In the second K site, K(2) is bonded in a distorted hexagonal planar geometry to six equivalent O(1) atoms. Sn(1) is bonded in a 3-coordinate geometry to one K(1) and three equivalent O(1) atoms. O(1) is bonded to two equivalent K(1), two equivalent K(2), and two equivalent Sn(1) atoms to form distorted OK4Sn2 octahedra that share corners with two equivalent K(1)Sn2O6 hexagonal bipyramids, corners with twelve equivalent O(1)K4Sn2 octahedra, and faces with four equivalent O(1)K4Sn2 octahedra. The corner-sharing octahedral tilt angles range from 0-62°. is represented by the CIF card [CIF]
data_K2Sn2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.872
_cell_length_b   5.872
_cell_length_c   5.872
_cell_angle_alpha   61.644
_cell_angle_beta   61.644
_cell_angle_gamma   61.644
_symmetry_Int_Tables_number   1
_cell_volume   148.455
_cell_formula_units_Z   1
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
  K  K0  1  0.500  0.500  0.500  1.0
  K  K1  1  0.000  0.000  0.000  1.0
  Sn  Sn2  1  0.242  0.242  0.242  1.0
  Sn  Sn3  1  0.758  0.758  0.758  1.0
  O  O4  1  0.000  0.500  0.000  1.0
  O  O5  1  0.000  0.000  0.500  1.0
  O  O6  1  0.500  0.000  0.000  1.0
[/CIF]
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The structure described by K2Sn2O3 crystallizes in the trigonal R-3m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent Sn(1) and six equivalent O(1) atoms to form distorted KSn2O6 hexagonal bipyramids that share corners with six equivalent K(1)Sn2O6 hexagonal bipyramids and corners with six equivalent O(1)K4Sn2 octahedra. The corner-sharing octahedral tilt angles are 58°. In the second K site, K(2) is bonded in a distorted hexagonal planar geometry to six equivalent O(1) atoms. Sn(1) is bonded in a 3-coordinate geometry to one K(1) and three equivalent O(1) atoms. O(1) is bonded to two equivalent K(1), two equivalent K(2), and two equivalent Sn(1) atoms to form distorted OK4Sn2 octahedra that share corners with two equivalent K(1)Sn2O6 hexagonal bipyramids, corners with twelve equivalent O(1)K4Sn2 octahedra, and faces with four equivalent O(1)K4Sn2 octahedra. The corner-sharing octahedral tilt angles range from 0-62°. is represented by the CIF card [CIF]
data_K2Sn2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.872
_cell_length_b   5.872
_cell_length_c   5.872
_cell_angle_alpha   61.644
_cell_angle_beta   61.644
_cell_angle_gamma   61.644
_symmetry_Int_Tables_number   1
_cell_volume   148.455
_cell_formula_units_Z   1
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
  K  K0  1  0.500  0.500  0.500  1.0
  K  K1  1  0.000  0.000  0.000  1.0
  Sn  Sn2  1  0.242  0.242  0.242  1.0
  Sn  Sn3  1  0.758  0.758  0.758  1.0
  O  O4  1  0.000  0.500  0.000  1.0
  O  O5  1  0.000  0.000  0.500  1.0
  O  O6  1  0.500  0.000  0.000  1.0
[/CIF]
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