The material structure described by NaNb6O15F crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(2), two equivalent O(7), and four equivalent O(8) atoms. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(3), one O(4), one O(5), one O(8), and two equivalent O(1) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, and  an edgeedge with one Nb(4)O5F2 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 6-47°. In the second Nb site, Nb(2) is bonded to one O(2), one O(4), one O(5), one O(9), and two equivalent O(7) atoms to form distorted NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra, and  an edgeedge with one Nb(4)O5F2 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 15-42°. In the third Nb site, Nb(3) is bonded to two equivalent O(6), two equivalent O(8), and two equivalent O(9) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, and  an edgeedge with one Nb(4)O5F2 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 4-47°. In the fourth Nb site, Nb(4) is bonded to one O(3), two equivalent O(5), two equivalent O(9), and two equivalent F(1) atoms to form NbO5F2 pentagonal bipyramids that share corners with two equivalent Nb(4)O5F2 pentagonal bipyramids,  an edgeedge with one Nb(3)O6 octahedra, edges with two equivalent Nb(1)O6 octahedra, and edges with two equivalent Nb(2)O6 octahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Nb(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1) and two equivalent Nb(2) atoms to form distorted corner-sharing ONa2Nb2 tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to one Nb(4) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Nb(1) and one Nb(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Nb(1), one Nb(2), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Na(1) and two equivalent Nb(3) atoms. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Na(1) and two equivalent Nb(2) atoms. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Nb(1), and one Nb(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Nb(2), one Nb(3), and one Nb(4) atom. F(1) is bonded in a linear geometry to two equivalent Nb(4) atoms. is represented by the CIF file [CIF]
data_NaNb6O15F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.144
_cell_length_b   9.144
_cell_length_c   3.952
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   109.842
_symmetry_Int_Tables_number   1
_cell_volume   310.822
_cell_formula_units_Z   1
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  0.596  0.404  0.500  1.0
  Nb  Nb1  1  0.005  0.628  0.000  1.0
  Nb  Nb2  1  0.622  0.737  0.000  1.0
  Nb  Nb3  1  0.263  0.378  0.000  1.0
  Nb  Nb4  1  0.782  0.218  0.000  1.0
  Nb  Nb5  1  0.001  0.999  0.000  1.0
  Nb  Nb6  1  0.372  0.995  0.000  1.0
  O  O7  1  0.361  0.991  0.500  1.0
  O  O8  1  0.487  0.513  0.000  1.0
  O  O9  1  0.137  0.863  0.000  1.0
  O  O10  1  0.468  0.834  0.000  1.0
  O  O11  1  0.166  0.532  0.000  1.0
  O  O12  1  0.231  0.143  0.000  1.0
  O  O13  1  0.857  0.769  0.000  1.0
  O  O14  1  0.778  0.222  0.500  1.0
  O  O15  1  0.284  0.364  0.500  1.0
  O  O16  1  0.636  0.716  0.500  1.0
  O  O17  1  0.009  0.639  0.500  1.0
  O  O18  1  0.820  0.446  0.000  1.0
  O  O19  1  0.010  0.228  0.000  1.0
  O  O20  1  0.772  0.990  0.000  1.0
  O  O21  1  0.554  0.180  0.000  1.0
  F  F22  1  0.000  1.000  0.500  1.0
[/CIF]
.
The material structure described by NaNb6O15F crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(2), two equivalent O(7), and four equivalent O(8) atoms. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(3), one O(4), one O(5), one O(8), and two equivalent O(1) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, and  an edgeedge with one Nb(4)O5F2 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 6-47°. In the second Nb site, Nb(2) is bonded to one O(2), one O(4), one O(5), one O(9), and two equivalent O(7) atoms to form distorted NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra, and  an edgeedge with one Nb(4)O5F2 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 15-42°. In the third Nb site, Nb(3) is bonded to two equivalent O(6), two equivalent O(8), and two equivalent O(9) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Nb(3)O6 octahedra, and  an edgeedge with one Nb(4)O5F2 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 4-47°. In the fourth Nb site, Nb(4) is bonded to one O(3), two equivalent O(5), two equivalent O(9), and two equivalent F(1) atoms to form NbO5F2 pentagonal bipyramids that share corners with two equivalent Nb(4)O5F2 pentagonal bipyramids,  an edgeedge with one Nb(3)O6 octahedra, edges with two equivalent Nb(1)O6 octahedra, and edges with two equivalent Nb(2)O6 octahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Nb(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1) and two equivalent Nb(2) atoms to form distorted corner-sharing ONa2Nb2 tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to one Nb(4) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Nb(1) and one Nb(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Nb(1), one Nb(2), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Na(1) and two equivalent Nb(3) atoms. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Na(1) and two equivalent Nb(2) atoms. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Nb(1), and one Nb(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Nb(2), one Nb(3), and one Nb(4) atom. F(1) is bonded in a linear geometry to two equivalent Nb(4) atoms. is represented by the CIF file [CIF]
data_NaNb6O15F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.144
_cell_length_b   9.144
_cell_length_c   3.952
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   109.842
_symmetry_Int_Tables_number   1
_cell_volume   310.822
_cell_formula_units_Z   1
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  0.596  0.404  0.500  1.0
  Nb  Nb1  1  0.005  0.628  0.000  1.0
  Nb  Nb2  1  0.622  0.737  0.000  1.0
  Nb  Nb3  1  0.263  0.378  0.000  1.0
  Nb  Nb4  1  0.782  0.218  0.000  1.0
  Nb  Nb5  1  0.001  0.999  0.000  1.0
  Nb  Nb6  1  0.372  0.995  0.000  1.0
  O  O7  1  0.361  0.991  0.500  1.0
  O  O8  1  0.487  0.513  0.000  1.0
  O  O9  1  0.137  0.863  0.000  1.0
  O  O10  1  0.468  0.834  0.000  1.0
  O  O11  1  0.166  0.532  0.000  1.0
  O  O12  1  0.231  0.143  0.000  1.0
  O  O13  1  0.857  0.769  0.000  1.0
  O  O14  1  0.778  0.222  0.500  1.0
  O  O15  1  0.284  0.364  0.500  1.0
  O  O16  1  0.636  0.716  0.500  1.0
  O  O17  1  0.009  0.639  0.500  1.0
  O  O18  1  0.820  0.446  0.000  1.0
  O  O19  1  0.010  0.228  0.000  1.0
  O  O20  1  0.772  0.990  0.000  1.0
  O  O21  1  0.554  0.180  0.000  1.0
  F  F22  1  0.000  1.000  0.500  1.0
[/CIF]
.