The compound described by Na2BSiSbO7 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 Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. Sb(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form SbO6 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 rectangular see-saw-like geometry to two equivalent Na(1), one B(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one B(1), and one Sb(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 Sb(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Si(1), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Sb(1) atom. is represented by the CIF file [CIF]
data_Na2SiBSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.640
_cell_length_b   5.442
_cell_length_c   9.385
_cell_angle_alpha   86.876
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   338.640
_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  0.005  0.762  0.804  1.0
  Na  Na1  1  0.495  0.762  0.804  1.0
  Na  Na2  1  0.505  0.238  0.196  1.0
  Na  Na3  1  0.995  0.238  0.196  1.0
  Si  Si4  1  0.750  0.269  0.564  1.0
  Si  Si5  1  0.250  0.731  0.436  1.0
  B  B6  1  0.250  0.279  0.921  1.0
  B  B7  1  0.750  0.721  0.079  1.0
  Sb  Sb8  1  0.250  0.217  0.655  1.0
  Sb  Sb9  1  0.750  0.783  0.345  1.0
  O  O10  1  0.750  0.682  0.943  1.0
  O  O11  1  0.250  0.048  0.853  1.0
  O  O12  1  0.250  0.468  0.805  1.0
  O  O13  1  0.948  0.194  0.661  1.0
  O  O14  1  0.552  0.194  0.661  1.0
  O  O15  1  0.250  0.877  0.586  1.0
  O  O16  1  0.750  0.571  0.523  1.0
  O  O17  1  0.250  0.429  0.477  1.0
  O  O18  1  0.750  0.123  0.414  1.0
  O  O19  1  0.448  0.806  0.339  1.0
  O  O20  1  0.052  0.806  0.339  1.0
  O  O21  1  0.750  0.532  0.195  1.0
  O  O22  1  0.750  0.952  0.147  1.0
  O  O23  1  0.250  0.318  0.057  1.0
[/CIF]
.
The compound described by Na2BSiSbO7 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 Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. Sb(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form SbO6 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 rectangular see-saw-like geometry to two equivalent Na(1), one B(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one B(1), and one Sb(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 Sb(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Si(1), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Sb(1) atom. is represented by the CIF file [CIF]
data_Na2SiBSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.640
_cell_length_b   5.442
_cell_length_c   9.385
_cell_angle_alpha   86.876
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   338.640
_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  0.005  0.762  0.804  1.0
  Na  Na1  1  0.495  0.762  0.804  1.0
  Na  Na2  1  0.505  0.238  0.196  1.0
  Na  Na3  1  0.995  0.238  0.196  1.0
  Si  Si4  1  0.750  0.269  0.564  1.0
  Si  Si5  1  0.250  0.731  0.436  1.0
  B  B6  1  0.250  0.279  0.921  1.0
  B  B7  1  0.750  0.721  0.079  1.0
  Sb  Sb8  1  0.250  0.217  0.655  1.0
  Sb  Sb9  1  0.750  0.783  0.345  1.0
  O  O10  1  0.750  0.682  0.943  1.0
  O  O11  1  0.250  0.048  0.853  1.0
  O  O12  1  0.250  0.468  0.805  1.0
  O  O13  1  0.948  0.194  0.661  1.0
  O  O14  1  0.552  0.194  0.661  1.0
  O  O15  1  0.250  0.877  0.586  1.0
  O  O16  1  0.750  0.571  0.523  1.0
  O  O17  1  0.250  0.429  0.477  1.0
  O  O18  1  0.750  0.123  0.414  1.0
  O  O19  1  0.448  0.806  0.339  1.0
  O  O20  1  0.052  0.806  0.339  1.0
  O  O21  1  0.750  0.532  0.195  1.0
  O  O22  1  0.750  0.952  0.147  1.0
  O  O23  1  0.250  0.318  0.057  1.0
[/CIF]
.