The structure described by NaNb2Bi2O9 crystallizes in the orthorhombic Cmc2_1 space group. Na(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(5) atoms. Nb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 21-33°. Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1) and two equivalent Nb(1) atoms. In the second O site, O(1) is bonded to two equivalent Na(1) and two equivalent Nb(1) atoms to form distorted corner-sharing ONa2Nb2 tetrahedra. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Bi(1) atoms. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one Na(1) and two equivalent Nb(1) atoms. In the fifth O site, O(4) is bonded to four equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaNb2Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.585
_cell_length_b   5.676
_cell_length_c   12.542
_cell_angle_alpha   90.000
_cell_angle_beta   102.865
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   387.621
_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  0.236  0.554  0.000  1.0
  Na  Na1  1  0.764  0.054  0.000  1.0
  Nb  Nb2  1  0.337  0.042  0.158  1.0
  Nb  Nb3  1  0.663  0.542  0.842  1.0
  Nb  Nb4  1  0.821  0.542  0.158  1.0
  Nb  Nb5  1  0.179  0.042  0.842  1.0
  Bi  Bi6  1  0.593  0.125  0.606  1.0
  Bi  Bi7  1  0.407  0.625  0.394  1.0
  Bi  Bi8  1  0.013  0.625  0.606  1.0
  Bi  Bi9  1  0.987  0.125  0.394  1.0
  O  O10  1  0.333  0.979  0.000  1.0
  O  O11  1  0.667  0.479  0.000  1.0
  O  O12  1  0.307  0.991  0.314  1.0
  O  O13  1  0.693  0.491  0.686  1.0
  O  O14  1  0.007  0.491  0.314  1.0
  O  O15  1  0.993  0.991  0.686  1.0
  O  O16  1  0.441  0.222  0.809  1.0
  O  O17  1  0.559  0.722  0.191  1.0
  O  O18  1  0.368  0.722  0.809  1.0
  O  O19  1  0.632  0.222  0.191  1.0
  O  O20  1  0.275  0.331  0.506  1.0
  O  O21  1  0.725  0.831  0.494  1.0
  O  O22  1  0.230  0.831  0.506  1.0
  O  O23  1  0.770  0.331  0.494  1.0
  O  O24  1  0.101  0.282  0.129  1.0
  O  O25  1  0.899  0.782  0.871  1.0
  O  O26  1  0.029  0.782  0.129  1.0
  O  O27  1  0.971  0.282  0.871  1.0
[/CIF]
.
The structure described by NaNb2Bi2O9 crystallizes in the orthorhombic Cmc2_1 space group. Na(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(5) atoms. Nb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 21-33°. Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1) and two equivalent Nb(1) atoms. In the second O site, O(1) is bonded to two equivalent Na(1) and two equivalent Nb(1) atoms to form distorted corner-sharing ONa2Nb2 tetrahedra. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Bi(1) atoms. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one Na(1) and two equivalent Nb(1) atoms. In the fifth O site, O(4) is bonded to four equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaNb2Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.585
_cell_length_b   5.676
_cell_length_c   12.542
_cell_angle_alpha   90.000
_cell_angle_beta   102.865
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   387.621
_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  0.236  0.554  0.000  1.0
  Na  Na1  1  0.764  0.054  0.000  1.0
  Nb  Nb2  1  0.337  0.042  0.158  1.0
  Nb  Nb3  1  0.663  0.542  0.842  1.0
  Nb  Nb4  1  0.821  0.542  0.158  1.0
  Nb  Nb5  1  0.179  0.042  0.842  1.0
  Bi  Bi6  1  0.593  0.125  0.606  1.0
  Bi  Bi7  1  0.407  0.625  0.394  1.0
  Bi  Bi8  1  0.013  0.625  0.606  1.0
  Bi  Bi9  1  0.987  0.125  0.394  1.0
  O  O10  1  0.333  0.979  0.000  1.0
  O  O11  1  0.667  0.479  0.000  1.0
  O  O12  1  0.307  0.991  0.314  1.0
  O  O13  1  0.693  0.491  0.686  1.0
  O  O14  1  0.007  0.491  0.314  1.0
  O  O15  1  0.993  0.991  0.686  1.0
  O  O16  1  0.441  0.222  0.809  1.0
  O  O17  1  0.559  0.722  0.191  1.0
  O  O18  1  0.368  0.722  0.809  1.0
  O  O19  1  0.632  0.222  0.191  1.0
  O  O20  1  0.275  0.331  0.506  1.0
  O  O21  1  0.725  0.831  0.494  1.0
  O  O22  1  0.230  0.831  0.506  1.0
  O  O23  1  0.770  0.331  0.494  1.0
  O  O24  1  0.101  0.282  0.129  1.0
  O  O25  1  0.899  0.782  0.871  1.0
  O  O26  1  0.029  0.782  0.129  1.0
  O  O27  1  0.971  0.282  0.871  1.0
[/CIF]
.