The structure described by NaNb14O36 crystallizes in the orthorhombic Immm space group. Na(1) is bonded in a square co-planar geometry to four equivalent O(8) atoms. There are five inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(8), one O(9), and two equivalent O(6) atoms. In the second Nb site, Nb(2) is bonded to one O(3), one O(4), one O(5), and three equivalent O(7) atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 6-31°. In the third Nb site, Nb(3) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(2) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 7-16°. In the fourth Nb site, Nb(4) is bonded in a 6-coordinate geometry to two equivalent O(5), two equivalent O(6), and two equivalent O(9) atoms. In the fifth Nb site, Nb(5) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 6-13°. There are eleven inequivalent O sites. In the first O site, O(11) is bonded in a linear geometry to two equivalent Nb(3) atoms. In the second O site, O(2) is bonded in a linear geometry to one Nb(3) and one Nb(5) atom. In the third O site, O(3) is bonded in a linear geometry to one Nb(1) and one Nb(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Nb(2) and one Nb(5) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Nb(2) and one Nb(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Nb(4) and two equivalent Nb(1) atoms. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to three equivalent Nb(2) atoms. In the eighth O site, O(10) is bonded in a linear geometry to two equivalent Nb(5) atoms. In the ninth O site, O(8) is bonded to two equivalent Na(1) and two equivalent Nb(1) atoms to form ONa2Nb2 tetrahedra that share corners with four equivalent O(8)Na2Nb2 tetrahedra,  an edgeedge with one O(8)Na2Nb2 tetrahedra, and  an edgeedge with one O(9)Nb4 trigonal pyramid. In the tenth O site, O(9) is bonded to two equivalent Nb(1) and two equivalent Nb(4) atoms to form distorted ONb4 trigonal pyramids that share corners with two equivalent O(9)Nb4 trigonal pyramids and  an edgeedge with one O(8)Na2Nb2 tetrahedra. In the eleventh O site, O(1) is bonded in a linear geometry to one Nb(1) and one Nb(3) atom. is represented by the CIF card [CIF]
data_NaNb14O36
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.331
_cell_length_b   15.331
_cell_length_c   15.331
_cell_angle_alpha   165.446
_cell_angle_beta   123.520
_cell_angle_gamma   58.658
_symmetry_Int_Tables_number   1
_cell_volume   753.128
_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  0.000  0.000  0.000  1.0
  Nb  Nb1  1  0.778  0.398  0.380  1.0
  Nb  Nb2  1  0.982  0.602  0.380  1.0
  Nb  Nb3  1  0.018  0.398  0.620  1.0
  Nb  Nb4  1  0.222  0.602  0.620  1.0
  Nb  Nb5  1  0.487  0.293  0.194  1.0
  Nb  Nb6  1  0.902  0.707  0.194  1.0
  Nb  Nb7  1  0.098  0.293  0.806  1.0
  Nb  Nb8  1  0.513  0.707  0.806  1.0
  Nb  Nb9  1  0.683  0.500  0.183  1.0
  Nb  Nb10  1  0.317  0.500  0.817  1.0
  Nb  Nb11  1  0.812  0.812  0.000  1.0
  Nb  Nb12  1  0.188  0.188  0.000  1.0
  Nb  Nb13  1  0.606  0.606  0.000  1.0
  Nb  Nb14  1  0.394  0.394  0.000  1.0
  O  O15  1  0.747  0.449  0.298  1.0
  O  O16  1  0.850  0.551  0.298  1.0
  O  O17  1  0.150  0.449  0.702  1.0
  O  O18  1  0.253  0.551  0.702  1.0
  O  O19  1  0.543  0.445  0.099  1.0
  O  O20  1  0.654  0.555  0.099  1.0
  O  O21  1  0.346  0.445  0.901  1.0
  O  O22  1  0.457  0.555  0.901  1.0
  O  O23  1  0.632  0.340  0.293  1.0
  O  O24  1  0.953  0.660  0.293  1.0
  O  O25  1  0.047  0.340  0.707  1.0
  O  O26  1  0.368  0.660  0.707  1.0
  O  O27  1  0.436  0.338  0.099  1.0
  O  O28  1  0.761  0.662  0.099  1.0
  O  O29  1  0.239  0.338  0.901  1.0
  O  O30  1  0.564  0.662  0.901  1.0
  O  O31  1  0.328  0.232  0.096  1.0
  O  O32  1  0.865  0.768  0.096  1.0
  O  O33  1  0.135  0.232  0.904  1.0
  O  O34  1  0.672  0.768  0.904  1.0
  O  O35  1  0.785  0.883  0.902  1.0
  O  O36  1  0.019  0.117  0.902  1.0
  O  O37  1  0.981  0.883  0.098  1.0
  O  O38  1  0.215  0.117  0.098  1.0
  O  O39  1  0.482  0.774  0.708  1.0
  O  O40  1  0.934  0.226  0.708  1.0
  O  O41  1  0.066  0.774  0.292  1.0
  O  O42  1  0.518  0.226  0.292  1.0
  O  O43  1  0.938  0.438  0.500  1.0
  O  O44  1  0.062  0.562  0.500  1.0
  O  O45  1  0.836  0.336  0.500  1.0
  O  O46  1  0.164  0.664  0.500  1.0
  O  O47  1  0.614  0.114  0.500  1.0
  O  O48  1  0.386  0.886  0.500  1.0
  O  O49  1  0.702  0.000  0.702  1.0
  O  O50  1  0.298  0.000  0.298  1.0
[/CIF]
.
The structure described by NaNb14O36 crystallizes in the orthorhombic Immm space group. Na(1) is bonded in a square co-planar geometry to four equivalent O(8) atoms. There are five inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(8), one O(9), and two equivalent O(6) atoms. In the second Nb site, Nb(2) is bonded to one O(3), one O(4), one O(5), and three equivalent O(7) atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 6-31°. In the third Nb site, Nb(3) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(2) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 7-16°. In the fourth Nb site, Nb(4) is bonded in a 6-coordinate geometry to two equivalent O(5), two equivalent O(6), and two equivalent O(9) atoms. In the fifth Nb site, Nb(5) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 6-13°. There are eleven inequivalent O sites. In the first O site, O(11) is bonded in a linear geometry to two equivalent Nb(3) atoms. In the second O site, O(2) is bonded in a linear geometry to one Nb(3) and one Nb(5) atom. In the third O site, O(3) is bonded in a linear geometry to one Nb(1) and one Nb(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Nb(2) and one Nb(5) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Nb(2) and one Nb(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Nb(4) and two equivalent Nb(1) atoms. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to three equivalent Nb(2) atoms. In the eighth O site, O(10) is bonded in a linear geometry to two equivalent Nb(5) atoms. In the ninth O site, O(8) is bonded to two equivalent Na(1) and two equivalent Nb(1) atoms to form ONa2Nb2 tetrahedra that share corners with four equivalent O(8)Na2Nb2 tetrahedra,  an edgeedge with one O(8)Na2Nb2 tetrahedra, and  an edgeedge with one O(9)Nb4 trigonal pyramid. In the tenth O site, O(9) is bonded to two equivalent Nb(1) and two equivalent Nb(4) atoms to form distorted ONb4 trigonal pyramids that share corners with two equivalent O(9)Nb4 trigonal pyramids and  an edgeedge with one O(8)Na2Nb2 tetrahedra. In the eleventh O site, O(1) is bonded in a linear geometry to one Nb(1) and one Nb(3) atom. is represented by the CIF card [CIF]
data_NaNb14O36
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.331
_cell_length_b   15.331
_cell_length_c   15.331
_cell_angle_alpha   165.446
_cell_angle_beta   123.520
_cell_angle_gamma   58.658
_symmetry_Int_Tables_number   1
_cell_volume   753.128
_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  0.000  0.000  0.000  1.0
  Nb  Nb1  1  0.778  0.398  0.380  1.0
  Nb  Nb2  1  0.982  0.602  0.380  1.0
  Nb  Nb3  1  0.018  0.398  0.620  1.0
  Nb  Nb4  1  0.222  0.602  0.620  1.0
  Nb  Nb5  1  0.487  0.293  0.194  1.0
  Nb  Nb6  1  0.902  0.707  0.194  1.0
  Nb  Nb7  1  0.098  0.293  0.806  1.0
  Nb  Nb8  1  0.513  0.707  0.806  1.0
  Nb  Nb9  1  0.683  0.500  0.183  1.0
  Nb  Nb10  1  0.317  0.500  0.817  1.0
  Nb  Nb11  1  0.812  0.812  0.000  1.0
  Nb  Nb12  1  0.188  0.188  0.000  1.0
  Nb  Nb13  1  0.606  0.606  0.000  1.0
  Nb  Nb14  1  0.394  0.394  0.000  1.0
  O  O15  1  0.747  0.449  0.298  1.0
  O  O16  1  0.850  0.551  0.298  1.0
  O  O17  1  0.150  0.449  0.702  1.0
  O  O18  1  0.253  0.551  0.702  1.0
  O  O19  1  0.543  0.445  0.099  1.0
  O  O20  1  0.654  0.555  0.099  1.0
  O  O21  1  0.346  0.445  0.901  1.0
  O  O22  1  0.457  0.555  0.901  1.0
  O  O23  1  0.632  0.340  0.293  1.0
  O  O24  1  0.953  0.660  0.293  1.0
  O  O25  1  0.047  0.340  0.707  1.0
  O  O26  1  0.368  0.660  0.707  1.0
  O  O27  1  0.436  0.338  0.099  1.0
  O  O28  1  0.761  0.662  0.099  1.0
  O  O29  1  0.239  0.338  0.901  1.0
  O  O30  1  0.564  0.662  0.901  1.0
  O  O31  1  0.328  0.232  0.096  1.0
  O  O32  1  0.865  0.768  0.096  1.0
  O  O33  1  0.135  0.232  0.904  1.0
  O  O34  1  0.672  0.768  0.904  1.0
  O  O35  1  0.785  0.883  0.902  1.0
  O  O36  1  0.019  0.117  0.902  1.0
  O  O37  1  0.981  0.883  0.098  1.0
  O  O38  1  0.215  0.117  0.098  1.0
  O  O39  1  0.482  0.774  0.708  1.0
  O  O40  1  0.934  0.226  0.708  1.0
  O  O41  1  0.066  0.774  0.292  1.0
  O  O42  1  0.518  0.226  0.292  1.0
  O  O43  1  0.938  0.438  0.500  1.0
  O  O44  1  0.062  0.562  0.500  1.0
  O  O45  1  0.836  0.336  0.500  1.0
  O  O46  1  0.164  0.664  0.500  1.0
  O  O47  1  0.614  0.114  0.500  1.0
  O  O48  1  0.386  0.886  0.500  1.0
  O  O49  1  0.702  0.000  0.702  1.0
  O  O50  1  0.298  0.000  0.298  1.0
[/CIF]
.