The structure described by Si3Bi2O9 crystallizes in the hexagonal P6_3/m space group. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Si(1) and two equivalent Bi(1) atoms. is represented by the CIF card [CIF]
data_Si3Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.806
_cell_length_b   6.806
_cell_length_c   9.523
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   382.040
_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
  Si  Si0  1  0.216  0.280  0.750  1.0
  Si  Si1  1  0.720  0.936  0.750  1.0
  Si  Si2  1  0.784  0.720  0.250  1.0
  Si  Si3  1  0.936  0.216  0.250  1.0
  Si  Si4  1  0.064  0.784  0.750  1.0
  Si  Si5  1  0.280  0.064  0.250  1.0
  Bi  Bi6  1  0.667  0.333  0.528  1.0
  Bi  Bi7  1  0.667  0.333  0.972  1.0
  Bi  Bi8  1  0.333  0.667  0.028  1.0
  Bi  Bi9  1  0.333  0.667  0.472  1.0
  O  O10  1  0.192  0.247  0.250  1.0
  O  O11  1  0.584  0.925  0.608  1.0
  O  O12  1  0.340  0.416  0.892  1.0
  O  O13  1  0.945  0.192  0.750  1.0
  O  O14  1  0.055  0.808  0.250  1.0
  O  O15  1  0.925  0.340  0.392  1.0
  O  O16  1  0.925  0.340  0.108  1.0
  O  O17  1  0.247  0.055  0.750  1.0
  O  O18  1  0.808  0.753  0.750  1.0
  O  O19  1  0.075  0.660  0.608  1.0
  O  O20  1  0.416  0.075  0.392  1.0
  O  O21  1  0.075  0.660  0.892  1.0
  O  O22  1  0.660  0.584  0.108  1.0
  O  O23  1  0.660  0.584  0.392  1.0
  O  O24  1  0.753  0.945  0.250  1.0
  O  O25  1  0.416  0.075  0.108  1.0
  O  O26  1  0.340  0.416  0.608  1.0
  O  O27  1  0.584  0.925  0.892  1.0
[/CIF]
.
The structure described by Si3Bi2O9 crystallizes in the hexagonal P6_3/m space group. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Si(1) and two equivalent Bi(1) atoms. is represented by the CIF card [CIF]
data_Si3Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.806
_cell_length_b   6.806
_cell_length_c   9.523
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   382.040
_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
  Si  Si0  1  0.216  0.280  0.750  1.0
  Si  Si1  1  0.720  0.936  0.750  1.0
  Si  Si2  1  0.784  0.720  0.250  1.0
  Si  Si3  1  0.936  0.216  0.250  1.0
  Si  Si4  1  0.064  0.784  0.750  1.0
  Si  Si5  1  0.280  0.064  0.250  1.0
  Bi  Bi6  1  0.667  0.333  0.528  1.0
  Bi  Bi7  1  0.667  0.333  0.972  1.0
  Bi  Bi8  1  0.333  0.667  0.028  1.0
  Bi  Bi9  1  0.333  0.667  0.472  1.0
  O  O10  1  0.192  0.247  0.250  1.0
  O  O11  1  0.584  0.925  0.608  1.0
  O  O12  1  0.340  0.416  0.892  1.0
  O  O13  1  0.945  0.192  0.750  1.0
  O  O14  1  0.055  0.808  0.250  1.0
  O  O15  1  0.925  0.340  0.392  1.0
  O  O16  1  0.925  0.340  0.108  1.0
  O  O17  1  0.247  0.055  0.750  1.0
  O  O18  1  0.808  0.753  0.750  1.0
  O  O19  1  0.075  0.660  0.608  1.0
  O  O20  1  0.416  0.075  0.392  1.0
  O  O21  1  0.075  0.660  0.892  1.0
  O  O22  1  0.660  0.584  0.108  1.0
  O  O23  1  0.660  0.584  0.392  1.0
  O  O24  1  0.753  0.945  0.250  1.0
  O  O25  1  0.416  0.075  0.108  1.0
  O  O26  1  0.340  0.416  0.608  1.0
  O  O27  1  0.584  0.925  0.892  1.0
[/CIF]
.