The crystal structure described by NaNb3(TeO4)4 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(7), and two equivalent O(9) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 15-36°. In the second Nb site, Nb(2) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 15-32°. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(6) and two equivalent O(10) atoms. In the second Te site, Te(2) is bonded in a distorted rectangular see-saw-like geometry to one O(6), one O(7), and two equivalent O(3) atoms. In the third Te site, Te(3) is bonded in a distorted rectangular see-saw-like geometry to one O(4), one O(7), and two equivalent O(9) atoms. In the fourth Te site, Te(4) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. There are eleven inequivalent O sites. In the first O site, O(10) is bonded in a bent 150 degrees geometry to one Nb(2) and one Te(1) atom. In the second O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Nb(2) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Nb(1) atoms. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Nb(1), and one Te(4) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Nb(1) and one Te(2) atom. In the sixth O site, O(4) is bonded to two equivalent Na(1), one Te(3), and one Te(4) atom to form a mixture of distorted edge and corner-sharing ONa2Te2 tetrahedra. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Nb(1) atoms. In the eighth O site, O(6) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(2) atom. In the ninth O site, O(7) is bonded to two equivalent Na(1), one Te(2), and one Te(3) atom to form a mixture of distorted edge and corner-sharing ONa2Te2 tetrahedra. In the tenth O site, O(8) is bonded in a linear geometry to one Nb(1) and one Nb(2) atom. In the eleventh O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Nb(1), and one Te(3) atom. is represented by the CIF file [CIF]
data_NaNb3(TeO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.556
_cell_length_b   6.713
_cell_length_c   14.427
_cell_angle_alpha   77.911
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   715.485
_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  0.500  0.500  0.500  1.0
  Na  Na1  1  0.000  0.500  0.500  1.0
  Nb  Nb2  1  0.500  0.077  0.726  1.0
  Nb  Nb3  1  0.000  0.077  0.726  1.0
  Nb  Nb4  1  0.500  0.923  0.274  1.0
  Nb  Nb5  1  0.500  0.000  0.000  1.0
  Nb  Nb6  1  1.000  0.923  0.274  1.0
  Nb  Nb7  1  0.000  0.000  0.000  1.0
  Te  Te8  1  0.250  0.489  0.999  1.0
  Te  Te9  1  0.250  0.596  0.721  1.0
  Te  Te10  1  0.750  0.053  0.502  1.0
  Te  Te11  1  0.750  0.574  0.711  1.0
  Te  Te12  1  0.750  0.511  0.001  1.0
  Te  Te13  1  0.250  0.947  0.498  1.0
  Te  Te14  1  0.250  0.426  0.289  1.0
  Te  Te15  1  0.750  0.404  0.279  1.0
  O  O16  1  0.250  0.010  0.261  1.0
  O  O17  1  0.561  0.379  0.705  1.0
  O  O18  1  0.446  0.781  0.718  1.0
  O  O19  1  0.250  0.312  0.419  1.0
  O  O20  1  0.250  0.143  0.689  1.0
  O  O21  1  0.750  0.387  0.127  1.0
  O  O22  1  0.750  0.688  0.581  1.0
  O  O23  1  0.054  0.781  0.718  1.0
  O  O24  1  0.750  0.346  0.423  1.0
  O  O25  1  0.533  0.953  0.142  1.0
  O  O26  1  0.946  0.219  0.282  1.0
  O  O27  1  0.058  0.877  0.426  1.0
  O  O28  1  0.033  0.047  0.858  1.0
  O  O29  1  0.439  0.621  0.295  1.0
  O  O30  1  0.750  0.857  0.311  1.0
  O  O31  1  0.750  0.990  0.739  1.0
  O  O32  1  0.939  0.379  0.705  1.0
  O  O33  1  0.467  0.047  0.858  1.0
  O  O34  1  0.441  0.297  0.995  1.0
  O  O35  1  0.942  0.123  0.574  1.0
  O  O36  1  0.941  0.703  0.005  1.0
  O  O37  1  0.250  0.613  0.873  1.0
  O  O38  1  0.750  0.080  0.981  1.0
  O  O39  1  0.442  0.877  0.426  1.0
  O  O40  1  0.250  0.654  0.577  1.0
  O  O41  1  0.059  0.297  0.995  1.0
  O  O42  1  0.558  0.123  0.574  1.0
  O  O43  1  0.559  0.703  0.005  1.0
  O  O44  1  0.250  0.920  0.019  1.0
  O  O45  1  0.061  0.621  0.295  1.0
  O  O46  1  0.967  0.953  0.142  1.0
  O  O47  1  0.554  0.219  0.282  1.0
[/CIF]
.
The crystal structure described by NaNb3(TeO4)4 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(7), and two equivalent O(9) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 15-36°. In the second Nb site, Nb(2) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 15-32°. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(6) and two equivalent O(10) atoms. In the second Te site, Te(2) is bonded in a distorted rectangular see-saw-like geometry to one O(6), one O(7), and two equivalent O(3) atoms. In the third Te site, Te(3) is bonded in a distorted rectangular see-saw-like geometry to one O(4), one O(7), and two equivalent O(9) atoms. In the fourth Te site, Te(4) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. There are eleven inequivalent O sites. In the first O site, O(10) is bonded in a bent 150 degrees geometry to one Nb(2) and one Te(1) atom. In the second O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Nb(2) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Nb(1) atoms. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Nb(1), and one Te(4) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Nb(1) and one Te(2) atom. In the sixth O site, O(4) is bonded to two equivalent Na(1), one Te(3), and one Te(4) atom to form a mixture of distorted edge and corner-sharing ONa2Te2 tetrahedra. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Nb(1) atoms. In the eighth O site, O(6) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(2) atom. In the ninth O site, O(7) is bonded to two equivalent Na(1), one Te(2), and one Te(3) atom to form a mixture of distorted edge and corner-sharing ONa2Te2 tetrahedra. In the tenth O site, O(8) is bonded in a linear geometry to one Nb(1) and one Nb(2) atom. In the eleventh O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Nb(1), and one Te(3) atom. is represented by the CIF file [CIF]
data_NaNb3(TeO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.556
_cell_length_b   6.713
_cell_length_c   14.427
_cell_angle_alpha   77.911
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   715.485
_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  0.500  0.500  0.500  1.0
  Na  Na1  1  0.000  0.500  0.500  1.0
  Nb  Nb2  1  0.500  0.077  0.726  1.0
  Nb  Nb3  1  0.000  0.077  0.726  1.0
  Nb  Nb4  1  0.500  0.923  0.274  1.0
  Nb  Nb5  1  0.500  0.000  0.000  1.0
  Nb  Nb6  1  1.000  0.923  0.274  1.0
  Nb  Nb7  1  0.000  0.000  0.000  1.0
  Te  Te8  1  0.250  0.489  0.999  1.0
  Te  Te9  1  0.250  0.596  0.721  1.0
  Te  Te10  1  0.750  0.053  0.502  1.0
  Te  Te11  1  0.750  0.574  0.711  1.0
  Te  Te12  1  0.750  0.511  0.001  1.0
  Te  Te13  1  0.250  0.947  0.498  1.0
  Te  Te14  1  0.250  0.426  0.289  1.0
  Te  Te15  1  0.750  0.404  0.279  1.0
  O  O16  1  0.250  0.010  0.261  1.0
  O  O17  1  0.561  0.379  0.705  1.0
  O  O18  1  0.446  0.781  0.718  1.0
  O  O19  1  0.250  0.312  0.419  1.0
  O  O20  1  0.250  0.143  0.689  1.0
  O  O21  1  0.750  0.387  0.127  1.0
  O  O22  1  0.750  0.688  0.581  1.0
  O  O23  1  0.054  0.781  0.718  1.0
  O  O24  1  0.750  0.346  0.423  1.0
  O  O25  1  0.533  0.953  0.142  1.0
  O  O26  1  0.946  0.219  0.282  1.0
  O  O27  1  0.058  0.877  0.426  1.0
  O  O28  1  0.033  0.047  0.858  1.0
  O  O29  1  0.439  0.621  0.295  1.0
  O  O30  1  0.750  0.857  0.311  1.0
  O  O31  1  0.750  0.990  0.739  1.0
  O  O32  1  0.939  0.379  0.705  1.0
  O  O33  1  0.467  0.047  0.858  1.0
  O  O34  1  0.441  0.297  0.995  1.0
  O  O35  1  0.942  0.123  0.574  1.0
  O  O36  1  0.941  0.703  0.005  1.0
  O  O37  1  0.250  0.613  0.873  1.0
  O  O38  1  0.750  0.080  0.981  1.0
  O  O39  1  0.442  0.877  0.426  1.0
  O  O40  1  0.250  0.654  0.577  1.0
  O  O41  1  0.059  0.297  0.995  1.0
  O  O42  1  0.558  0.123  0.574  1.0
  O  O43  1  0.559  0.703  0.005  1.0
  O  O44  1  0.250  0.920  0.019  1.0
  O  O45  1  0.061  0.621  0.295  1.0
  O  O46  1  0.967  0.953  0.142  1.0
  O  O47  1  0.554  0.219  0.282  1.0
[/CIF]
.