The material structure described by Na4Si3(SnO6)2 crystallizes in the trigonal R-3c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Sn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form SnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 30-40°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one Si(1) atom. In the second O site, O(2) is bonded to one Na(1), two equivalent Na(2), one Sn(1), and one Si(1) atom to form a mixture of distorted corner, edge, and face-sharing ONa3SiSn trigonal bipyramids. is represented by the CIF card [CIF]
data_Na4Si3(SnO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.953
_cell_length_b   8.953
_cell_length_c   8.953
_cell_angle_alpha   60.857
_cell_angle_beta   60.857
_cell_angle_gamma   60.857
_symmetry_Int_Tables_number   1
_cell_volume   517.312
_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
  Na  Na0  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.750  0.381  0.119  1.0
  Na  Na2  1  0.381  0.119  0.750  1.0
  Na  Na3  1  0.119  0.750  0.381  1.0
  Na  Na4  1  0.881  0.250  0.619  1.0
  Na  Na5  1  0.500  0.500  0.500  1.0
  Na  Na6  1  0.619  0.881  0.250  1.0
  Na  Na7  1  0.250  0.619  0.881  1.0
  Si  Si8  1  0.455  0.750  0.045  1.0
  Si  Si9  1  0.250  0.955  0.545  1.0
  Si  Si10  1  0.545  0.250  0.955  1.0
  Si  Si11  1  0.045  0.455  0.750  1.0
  Si  Si12  1  0.955  0.545  0.250  1.0
  Si  Si13  1  0.750  0.045  0.455  1.0
  Sn  Sn14  1  0.645  0.645  0.645  1.0
  Sn  Sn15  1  0.145  0.145  0.145  1.0
  Sn  Sn16  1  0.855  0.855  0.855  1.0
  Sn  Sn17  1  0.355  0.355  0.355  1.0
  O  O18  1  0.289  0.127  0.517  1.0
  O  O19  1  0.733  0.080  0.936  1.0
  O  O20  1  0.920  0.064  0.267  1.0
  O  O21  1  0.983  0.373  0.211  1.0
  O  O22  1  0.627  0.789  0.017  1.0
  O  O23  1  0.789  0.017  0.627  1.0
  O  O24  1  0.373  0.211  0.983  1.0
  O  O25  1  0.211  0.983  0.373  1.0
  O  O26  1  0.420  0.767  0.564  1.0
  O  O27  1  0.564  0.420  0.767  1.0
  O  O28  1  0.080  0.936  0.733  1.0
  O  O29  1  0.711  0.873  0.483  1.0
  O  O30  1  0.233  0.436  0.580  1.0
  O  O31  1  0.936  0.733  0.080  1.0
  O  O32  1  0.580  0.233  0.436  1.0
  O  O33  1  0.517  0.289  0.127  1.0
  O  O34  1  0.127  0.517  0.289  1.0
  O  O35  1  0.267  0.920  0.064  1.0
  O  O36  1  0.436  0.580  0.233  1.0
  O  O37  1  0.767  0.564  0.420  1.0
  O  O38  1  0.064  0.267  0.920  1.0
  O  O39  1  0.873  0.483  0.711  1.0
  O  O40  1  0.483  0.711  0.873  1.0
  O  O41  1  0.017  0.627  0.789  1.0
[/CIF]
.
The material structure described by Na4Si3(SnO6)2 crystallizes in the trigonal R-3c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Sn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form SnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 30-40°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one Si(1) atom. In the second O site, O(2) is bonded to one Na(1), two equivalent Na(2), one Sn(1), and one Si(1) atom to form a mixture of distorted corner, edge, and face-sharing ONa3SiSn trigonal bipyramids. is represented by the CIF card [CIF]
data_Na4Si3(SnO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.953
_cell_length_b   8.953
_cell_length_c   8.953
_cell_angle_alpha   60.857
_cell_angle_beta   60.857
_cell_angle_gamma   60.857
_symmetry_Int_Tables_number   1
_cell_volume   517.312
_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
  Na  Na0  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.750  0.381  0.119  1.0
  Na  Na2  1  0.381  0.119  0.750  1.0
  Na  Na3  1  0.119  0.750  0.381  1.0
  Na  Na4  1  0.881  0.250  0.619  1.0
  Na  Na5  1  0.500  0.500  0.500  1.0
  Na  Na6  1  0.619  0.881  0.250  1.0
  Na  Na7  1  0.250  0.619  0.881  1.0
  Si  Si8  1  0.455  0.750  0.045  1.0
  Si  Si9  1  0.250  0.955  0.545  1.0
  Si  Si10  1  0.545  0.250  0.955  1.0
  Si  Si11  1  0.045  0.455  0.750  1.0
  Si  Si12  1  0.955  0.545  0.250  1.0
  Si  Si13  1  0.750  0.045  0.455  1.0
  Sn  Sn14  1  0.645  0.645  0.645  1.0
  Sn  Sn15  1  0.145  0.145  0.145  1.0
  Sn  Sn16  1  0.855  0.855  0.855  1.0
  Sn  Sn17  1  0.355  0.355  0.355  1.0
  O  O18  1  0.289  0.127  0.517  1.0
  O  O19  1  0.733  0.080  0.936  1.0
  O  O20  1  0.920  0.064  0.267  1.0
  O  O21  1  0.983  0.373  0.211  1.0
  O  O22  1  0.627  0.789  0.017  1.0
  O  O23  1  0.789  0.017  0.627  1.0
  O  O24  1  0.373  0.211  0.983  1.0
  O  O25  1  0.211  0.983  0.373  1.0
  O  O26  1  0.420  0.767  0.564  1.0
  O  O27  1  0.564  0.420  0.767  1.0
  O  O28  1  0.080  0.936  0.733  1.0
  O  O29  1  0.711  0.873  0.483  1.0
  O  O30  1  0.233  0.436  0.580  1.0
  O  O31  1  0.936  0.733  0.080  1.0
  O  O32  1  0.580  0.233  0.436  1.0
  O  O33  1  0.517  0.289  0.127  1.0
  O  O34  1  0.127  0.517  0.289  1.0
  O  O35  1  0.267  0.920  0.064  1.0
  O  O36  1  0.436  0.580  0.233  1.0
  O  O37  1  0.767  0.564  0.420  1.0
  O  O38  1  0.064  0.267  0.920  1.0
  O  O39  1  0.873  0.483  0.711  1.0
  O  O40  1  0.483  0.711  0.873  1.0
  O  O41  1  0.017  0.627  0.789  1.0
[/CIF]
.