The material structure described by K2Sn2S5 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent S(2), three equivalent S(1), and three equivalent S(3) atoms. Sn(1) is bonded to one S(2), two equivalent S(1), and two equivalent S(3) atoms to form a mixture of corner and edge-sharing SnS5 trigonal bipyramids. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent K(1) and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing SK3Sn2 square pyramids. In the second S site, S(2) is bonded in a 6-coordinate geometry to four equivalent K(1) and two equivalent Sn(1) atoms. In the third S site, S(3) is bonded in a 5-coordinate geometry to three equivalent K(1) and two equivalent Sn(1) atoms. is represented by the CIF file [CIF]
data_K2Sn2S5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.805
_cell_length_b   6.805
_cell_length_c   11.684
_cell_angle_alpha   75.060
_cell_angle_beta   75.060
_cell_angle_gamma   70.349
_symmetry_Int_Tables_number   1
_cell_volume   483.496
_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
  K  K0  1  0.554  0.884  0.183  1.0
  K  K1  1  0.116  0.446  0.317  1.0
  K  K2  1  0.446  0.116  0.817  1.0
  K  K3  1  0.884  0.554  0.683  1.0
  Sn  Sn4  1  0.938  0.250  0.058  1.0
  Sn  Sn5  1  0.750  0.062  0.442  1.0
  Sn  Sn6  1  0.062  0.750  0.942  1.0
  Sn  Sn7  1  0.250  0.938  0.558  1.0
  S  S8  1  0.252  0.355  0.038  1.0
  S  S9  1  0.645  0.748  0.462  1.0
  S  S10  1  0.748  0.645  0.962  1.0
  S  S11  1  0.355  0.252  0.538  1.0
  S  S12  1  0.684  0.316  0.250  1.0
  S  S13  1  0.316  0.684  0.750  1.0
  S  S14  1  0.888  0.150  0.883  1.0
  S  S15  1  0.850  0.112  0.617  1.0
  S  S16  1  0.150  0.888  0.383  1.0
  S  S17  1  0.112  0.850  0.117  1.0
[/CIF]
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The material structure described by K2Sn2S5 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent S(2), three equivalent S(1), and three equivalent S(3) atoms. Sn(1) is bonded to one S(2), two equivalent S(1), and two equivalent S(3) atoms to form a mixture of corner and edge-sharing SnS5 trigonal bipyramids. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent K(1) and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing SK3Sn2 square pyramids. In the second S site, S(2) is bonded in a 6-coordinate geometry to four equivalent K(1) and two equivalent Sn(1) atoms. In the third S site, S(3) is bonded in a 5-coordinate geometry to three equivalent K(1) and two equivalent Sn(1) atoms. is represented by the CIF file [CIF]
data_K2Sn2S5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.805
_cell_length_b   6.805
_cell_length_c   11.684
_cell_angle_alpha   75.060
_cell_angle_beta   75.060
_cell_angle_gamma   70.349
_symmetry_Int_Tables_number   1
_cell_volume   483.496
_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
  K  K0  1  0.554  0.884  0.183  1.0
  K  K1  1  0.116  0.446  0.317  1.0
  K  K2  1  0.446  0.116  0.817  1.0
  K  K3  1  0.884  0.554  0.683  1.0
  Sn  Sn4  1  0.938  0.250  0.058  1.0
  Sn  Sn5  1  0.750  0.062  0.442  1.0
  Sn  Sn6  1  0.062  0.750  0.942  1.0
  Sn  Sn7  1  0.250  0.938  0.558  1.0
  S  S8  1  0.252  0.355  0.038  1.0
  S  S9  1  0.645  0.748  0.462  1.0
  S  S10  1  0.748  0.645  0.962  1.0
  S  S11  1  0.355  0.252  0.538  1.0
  S  S12  1  0.684  0.316  0.250  1.0
  S  S13  1  0.316  0.684  0.750  1.0
  S  S14  1  0.888  0.150  0.883  1.0
  S  S15  1  0.850  0.112  0.617  1.0
  S  S16  1  0.150  0.888  0.383  1.0
  S  S17  1  0.112  0.850  0.117  1.0
[/CIF]
.