The compound described by (K(SiO2)4)2O2 crystallizes in the hexagonal P6/mmm space group. The structure consists of one water atom inside a K(SiO2)4 framework. In the K(SiO2)4 framework, K(1) is bonded to twelve equivalent O(1) atoms to form KO12 cuboctahedra that share edges with six equivalent K(1)O12 cuboctahedra and edges with twelve equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(3) and three equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra and edges with three equivalent K(1)O12 cuboctahedra. There are two inequivalent O sites. In the first O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_KSi4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.248
_cell_length_b   5.248
_cell_length_c   7.727
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   184.285
_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  0.000  0.000  0.500  1.0
  Si  Si1  1  0.667  0.333  0.793  1.0
  Si  Si2  1  0.333  0.667  0.207  1.0
  Si  Si3  1  0.333  0.667  0.793  1.0
  Si  Si4  1  0.667  0.333  0.207  1.0
  O  O5  1  0.500  0.500  0.711  1.0
  O  O6  1  0.500  0.500  0.289  1.0
  O  O7  1  0.000  0.500  0.711  1.0
  O  O8  1  0.000  0.500  0.289  1.0
  O  O9  1  0.500  0.000  0.711  1.0
  O  O10  1  0.500  0.000  0.289  1.0
  O  O11  1  0.000  0.000  0.000  1.0
  O  O12  1  0.667  0.333  0.000  1.0
  O  O13  1  0.333  0.667  0.000  1.0
[/CIF]
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The compound described by (K(SiO2)4)2O2 crystallizes in the hexagonal P6/mmm space group. The structure consists of one water atom inside a K(SiO2)4 framework. In the K(SiO2)4 framework, K(1) is bonded to twelve equivalent O(1) atoms to form KO12 cuboctahedra that share edges with six equivalent K(1)O12 cuboctahedra and edges with twelve equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(3) and three equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra and edges with three equivalent K(1)O12 cuboctahedra. There are two inequivalent O sites. In the first O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_KSi4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.248
_cell_length_b   5.248
_cell_length_c   7.727
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   184.285
_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  0.000  0.000  0.500  1.0
  Si  Si1  1  0.667  0.333  0.793  1.0
  Si  Si2  1  0.333  0.667  0.207  1.0
  Si  Si3  1  0.333  0.667  0.793  1.0
  Si  Si4  1  0.667  0.333  0.207  1.0
  O  O5  1  0.500  0.500  0.711  1.0
  O  O6  1  0.500  0.500  0.289  1.0
  O  O7  1  0.000  0.500  0.711  1.0
  O  O8  1  0.000  0.500  0.289  1.0
  O  O9  1  0.500  0.000  0.711  1.0
  O  O10  1  0.500  0.000  0.289  1.0
  O  O11  1  0.000  0.000  0.000  1.0
  O  O12  1  0.667  0.333  0.000  1.0
  O  O13  1  0.333  0.667  0.000  1.0
[/CIF]
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