The crystal structure described by AgNb3O8 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(3), two equivalent O(2), and four equivalent O(1) atoms to form distorted NbO7 pentagonal bipyramids that share corners with two equivalent Nb(2)O8 hexagonal bipyramids, corners with two equivalent Nb(1)O7 pentagonal bipyramids, edges with two equivalent Nb(2)O8 hexagonal bipyramids, and edges with two equivalent Nb(1)O7 pentagonal bipyramids. In the second Nb site, Nb(2) is bonded to four equivalent O(1) and four equivalent O(3) atoms to form distorted NbO8 hexagonal bipyramids that share corners with four equivalent Nb(1)O7 pentagonal bipyramids, edges with two equivalent Nb(2)O8 hexagonal bipyramids, and edges with four equivalent Nb(1)O7 pentagonal bipyramids. Ag(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) and four equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nb(2), two equivalent Nb(1), and one Ag(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Nb(1) and two equivalent Ag(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to one Nb(1) and two equivalent Nb(2) atoms. is represented by the CIF file [CIF]
data_Nb3AgO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.380
_cell_length_b   7.380
_cell_length_c   7.380
_cell_angle_alpha   122.102
_cell_angle_beta   118.380
_cell_angle_gamma   89.614
_symmetry_Int_Tables_number   1
_cell_volume   282.781
_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
  Nb  Nb0  1  0.009  0.767  0.242  1.0
  Nb  Nb1  1  0.991  0.233  0.758  1.0
  Nb  Nb2  1  0.475  0.733  0.742  1.0
  Nb  Nb3  1  0.525  0.267  0.258  1.0
  Nb  Nb4  1  0.500  0.750  0.250  1.0
  Nb  Nb5  1  0.500  0.250  0.750  1.0
  Ag  Ag6  1  0.000  0.750  0.750  1.0
  Ag  Ag7  1  0.000  0.250  0.250  1.0
  O  O8  1  0.834  0.442  0.992  1.0
  O  O9  1  0.166  0.158  0.608  1.0
  O  O10  1  0.550  0.058  0.892  1.0
  O  O11  1  0.450  0.342  0.508  1.0
  O  O12  1  0.166  0.558  0.008  1.0
  O  O13  1  0.834  0.842  0.392  1.0
  O  O14  1  0.450  0.942  0.108  1.0
  O  O15  1  0.550  0.658  0.492  1.0
  O  O16  1  0.153  0.166  0.987  1.0
  O  O17  1  0.847  0.834  0.013  1.0
  O  O18  1  0.821  0.334  0.487  1.0
  O  O19  1  0.179  0.666  0.513  1.0
  O  O20  1  0.533  0.425  0.108  1.0
  O  O21  1  0.467  0.575  0.892  1.0
  O  O22  1  0.683  0.075  0.608  1.0
  O  O23  1  0.317  0.925  0.392  1.0
[/CIF]
.
The crystal structure described by AgNb3O8 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(3), two equivalent O(2), and four equivalent O(1) atoms to form distorted NbO7 pentagonal bipyramids that share corners with two equivalent Nb(2)O8 hexagonal bipyramids, corners with two equivalent Nb(1)O7 pentagonal bipyramids, edges with two equivalent Nb(2)O8 hexagonal bipyramids, and edges with two equivalent Nb(1)O7 pentagonal bipyramids. In the second Nb site, Nb(2) is bonded to four equivalent O(1) and four equivalent O(3) atoms to form distorted NbO8 hexagonal bipyramids that share corners with four equivalent Nb(1)O7 pentagonal bipyramids, edges with two equivalent Nb(2)O8 hexagonal bipyramids, and edges with four equivalent Nb(1)O7 pentagonal bipyramids. Ag(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) and four equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nb(2), two equivalent Nb(1), and one Ag(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Nb(1) and two equivalent Ag(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to one Nb(1) and two equivalent Nb(2) atoms. is represented by the CIF file [CIF]
data_Nb3AgO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.380
_cell_length_b   7.380
_cell_length_c   7.380
_cell_angle_alpha   122.102
_cell_angle_beta   118.380
_cell_angle_gamma   89.614
_symmetry_Int_Tables_number   1
_cell_volume   282.781
_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
  Nb  Nb0  1  0.009  0.767  0.242  1.0
  Nb  Nb1  1  0.991  0.233  0.758  1.0
  Nb  Nb2  1  0.475  0.733  0.742  1.0
  Nb  Nb3  1  0.525  0.267  0.258  1.0
  Nb  Nb4  1  0.500  0.750  0.250  1.0
  Nb  Nb5  1  0.500  0.250  0.750  1.0
  Ag  Ag6  1  0.000  0.750  0.750  1.0
  Ag  Ag7  1  0.000  0.250  0.250  1.0
  O  O8  1  0.834  0.442  0.992  1.0
  O  O9  1  0.166  0.158  0.608  1.0
  O  O10  1  0.550  0.058  0.892  1.0
  O  O11  1  0.450  0.342  0.508  1.0
  O  O12  1  0.166  0.558  0.008  1.0
  O  O13  1  0.834  0.842  0.392  1.0
  O  O14  1  0.450  0.942  0.108  1.0
  O  O15  1  0.550  0.658  0.492  1.0
  O  O16  1  0.153  0.166  0.987  1.0
  O  O17  1  0.847  0.834  0.013  1.0
  O  O18  1  0.821  0.334  0.487  1.0
  O  O19  1  0.179  0.666  0.513  1.0
  O  O20  1  0.533  0.425  0.108  1.0
  O  O21  1  0.467  0.575  0.892  1.0
  O  O22  1  0.683  0.075  0.608  1.0
  O  O23  1  0.317  0.925  0.392  1.0
[/CIF]
.