The compound described by Na2BSiBiO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Si(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-54°. Bi(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form BiO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one B(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one B(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to two equivalent Na(1), one B(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Bi(1) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Si(1), and one Bi(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Si(1) and one Bi(1) atom. is represented by the CIF file [CIF]
data_Na2SiBiBO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.909
_cell_length_b   5.438
_cell_length_c   9.415
_cell_angle_alpha   89.085
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   353.697
_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  0.999  0.766  0.791  1.0
  Na  Na1  1  0.501  0.766  0.791  1.0
  Na  Na2  1  0.499  0.234  0.209  1.0
  Na  Na3  1  0.001  0.234  0.209  1.0
  Si  Si4  1  0.750  0.283  0.573  1.0
  Si  Si5  1  0.250  0.717  0.427  1.0
  Bi  Bi6  1  0.250  0.220  0.654  1.0
  Bi  Bi7  1  0.750  0.780  0.346  1.0
  B  B8  1  0.250  0.272  0.931  1.0
  B  B9  1  0.750  0.728  0.069  1.0
  O  O10  1  0.750  0.697  0.931  1.0
  O  O11  1  0.250  0.042  0.859  1.0
  O  O12  1  0.250  0.472  0.827  1.0
  O  O13  1  0.938  0.198  0.667  1.0
  O  O14  1  0.562  0.198  0.667  1.0
  O  O15  1  0.250  0.841  0.587  1.0
  O  O16  1  0.750  0.588  0.548  1.0
  O  O17  1  0.250  0.412  0.452  1.0
  O  O18  1  0.750  0.159  0.413  1.0
  O  O19  1  0.438  0.802  0.333  1.0
  O  O20  1  0.062  0.802  0.333  1.0
  O  O21  1  0.750  0.528  0.173  1.0
  O  O22  1  0.750  0.958  0.141  1.0
  O  O23  1  0.250  0.303  0.069  1.0
[/CIF]
.
The compound described by Na2BSiBiO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Si(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-54°. Bi(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form BiO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one B(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one B(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to two equivalent Na(1), one B(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Bi(1) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Si(1), and one Bi(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Si(1) and one Bi(1) atom. is represented by the CIF file [CIF]
data_Na2SiBiBO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.909
_cell_length_b   5.438
_cell_length_c   9.415
_cell_angle_alpha   89.085
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   353.697
_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  0.999  0.766  0.791  1.0
  Na  Na1  1  0.501  0.766  0.791  1.0
  Na  Na2  1  0.499  0.234  0.209  1.0
  Na  Na3  1  0.001  0.234  0.209  1.0
  Si  Si4  1  0.750  0.283  0.573  1.0
  Si  Si5  1  0.250  0.717  0.427  1.0
  Bi  Bi6  1  0.250  0.220  0.654  1.0
  Bi  Bi7  1  0.750  0.780  0.346  1.0
  B  B8  1  0.250  0.272  0.931  1.0
  B  B9  1  0.750  0.728  0.069  1.0
  O  O10  1  0.750  0.697  0.931  1.0
  O  O11  1  0.250  0.042  0.859  1.0
  O  O12  1  0.250  0.472  0.827  1.0
  O  O13  1  0.938  0.198  0.667  1.0
  O  O14  1  0.562  0.198  0.667  1.0
  O  O15  1  0.250  0.841  0.587  1.0
  O  O16  1  0.750  0.588  0.548  1.0
  O  O17  1  0.250  0.412  0.452  1.0
  O  O18  1  0.750  0.159  0.413  1.0
  O  O19  1  0.438  0.802  0.333  1.0
  O  O20  1  0.062  0.802  0.333  1.0
  O  O21  1  0.750  0.528  0.173  1.0
  O  O22  1  0.750  0.958  0.141  1.0
  O  O23  1  0.250  0.303  0.069  1.0
[/CIF]
.