The compound described by LaNb8O14 crystallizes in the orthorhombic Pbam space group. La(1) is bonded to two equivalent O(4), two equivalent O(6), four equivalent O(2), and four equivalent O(5) atoms to form LaO12 cuboctahedra that share corners with two equivalent La(1)O12 cuboctahedra, corners with four equivalent Nb(1)O5 square pyramids, edges with two equivalent Nb(2)O5 square pyramids, edges with four equivalent Nb(1)O5 square pyramids, faces with four equivalent Nb(3)O6 octahedra, and faces with two equivalent Nb(2)O5 square pyramids. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form NbO5 square pyramids that share  a cornercorner with one La(1)O12 cuboctahedra,  a cornercorner with one Nb(3)O6 octahedra, corners with three equivalent Nb(1)O5 square pyramids, corners with three equivalent Nb(2)O5 square pyramids,  an edgeedge with one La(1)O12 cuboctahedra,  an edgeedge with one Nb(3)O6 octahedra, and  an edgeedge with one Nb(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 49°. In the second Nb site, Nb(2) is bonded to one O(4), two equivalent O(2), and two equivalent O(5) atoms to form NbO5 square pyramids that share corners with four equivalent Nb(3)O6 octahedra, corners with six equivalent Nb(1)O5 square pyramids,  an edgeedge with one La(1)O12 cuboctahedra, and  a faceface with one La(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 5-48°. In the third Nb site, Nb(3) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(5) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(1)O5 square pyramids, corners with four equivalent Nb(2)O5 square pyramids, edges with two equivalent Nb(1)O5 square pyramids, and faces with two equivalent La(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are six inequivalent O sites. In the first O site, O(4) is bonded to one La(1), one Nb(2), and two equivalent Nb(1) atoms to form distorted corner-sharing OLaNb3 tetrahedra. In the second O site, O(5) is bonded in a distorted T-shaped geometry to one La(1), one Nb(1), one Nb(2), and one Nb(3) atom. In the third O site, O(6) is bonded in a linear geometry to two equivalent La(1) and two equivalent Nb(3) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Nb(3) and two equivalent Nb(1) atoms. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one La(1), one Nb(1), one Nb(2), and one Nb(3) atom. In the sixth O site, O(3) is bonded in a square co-planar geometry to four equivalent Nb(1) atoms. is represented by the CIF file [CIF]
data_LaNb8O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.046
_cell_length_b   9.288
_cell_length_c   10.411
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   584.624
_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
  La  La0  1  0.500  0.000  0.000  1.0
  La  La1  1  0.500  0.500  0.500  1.0
  Nb  Nb2  1  0.269  0.126  0.423  1.0
  Nb  Nb3  1  0.731  0.874  0.577  1.0
  Nb  Nb4  1  0.269  0.874  0.577  1.0
  Nb  Nb5  1  0.731  0.374  0.923  1.0
  Nb  Nb6  1  0.731  0.126  0.423  1.0
  Nb  Nb7  1  0.269  0.626  0.077  1.0
  Nb  Nb8  1  0.731  0.626  0.077  1.0
  Nb  Nb9  1  0.269  0.374  0.923  1.0
  Nb  Nb10  1  0.500  0.380  0.164  1.0
  Nb  Nb11  1  0.500  0.620  0.836  1.0
  Nb  Nb12  1  0.500  0.120  0.664  1.0
  Nb  Nb13  1  0.500  0.880  0.336  1.0
  Nb  Nb14  1  0.000  0.115  0.165  1.0
  Nb  Nb15  1  0.000  0.885  0.835  1.0
  Nb  Nb16  1  0.000  0.385  0.665  1.0
  Nb  Nb17  1  0.000  0.615  0.335  1.0
  O  O18  1  0.000  0.235  0.321  1.0
  O  O19  1  0.000  0.765  0.679  1.0
  O  O20  1  0.000  0.265  0.821  1.0
  O  O21  1  0.000  0.735  0.179  1.0
  O  O22  1  0.261  0.234  0.083  1.0
  O  O23  1  0.739  0.766  0.917  1.0
  O  O24  1  0.261  0.766  0.917  1.0
  O  O25  1  0.739  0.266  0.583  1.0
  O  O26  1  0.739  0.234  0.083  1.0
  O  O27  1  0.261  0.734  0.417  1.0
  O  O28  1  0.739  0.734  0.417  1.0
  O  O29  1  0.261  0.266  0.583  1.0
  O  O30  1  0.000  0.000  0.500  1.0
  O  O31  1  0.000  0.500  0.000  1.0
  O  O32  1  0.500  0.272  0.353  1.0
  O  O33  1  0.500  0.728  0.647  1.0
  O  O34  1  0.500  0.228  0.853  1.0
  O  O35  1  0.500  0.772  0.147  1.0
  O  O36  1  0.257  0.004  0.246  1.0
  O  O37  1  0.743  0.996  0.754  1.0
  O  O38  1  0.257  0.996  0.754  1.0
  O  O39  1  0.743  0.496  0.746  1.0
  O  O40  1  0.743  0.004  0.246  1.0
  O  O41  1  0.257  0.504  0.254  1.0
  O  O42  1  0.743  0.504  0.254  1.0
  O  O43  1  0.257  0.496  0.746  1.0
  O  O44  1  0.000  0.000  0.000  1.0
  O  O45  1  0.000  0.500  0.500  1.0
[/CIF]
.
The compound described by LaNb8O14 crystallizes in the orthorhombic Pbam space group. La(1) is bonded to two equivalent O(4), two equivalent O(6), four equivalent O(2), and four equivalent O(5) atoms to form LaO12 cuboctahedra that share corners with two equivalent La(1)O12 cuboctahedra, corners with four equivalent Nb(1)O5 square pyramids, edges with two equivalent Nb(2)O5 square pyramids, edges with four equivalent Nb(1)O5 square pyramids, faces with four equivalent Nb(3)O6 octahedra, and faces with two equivalent Nb(2)O5 square pyramids. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form NbO5 square pyramids that share  a cornercorner with one La(1)O12 cuboctahedra,  a cornercorner with one Nb(3)O6 octahedra, corners with three equivalent Nb(1)O5 square pyramids, corners with three equivalent Nb(2)O5 square pyramids,  an edgeedge with one La(1)O12 cuboctahedra,  an edgeedge with one Nb(3)O6 octahedra, and  an edgeedge with one Nb(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 49°. In the second Nb site, Nb(2) is bonded to one O(4), two equivalent O(2), and two equivalent O(5) atoms to form NbO5 square pyramids that share corners with four equivalent Nb(3)O6 octahedra, corners with six equivalent Nb(1)O5 square pyramids,  an edgeedge with one La(1)O12 cuboctahedra, and  a faceface with one La(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 5-48°. In the third Nb site, Nb(3) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(5) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(3)O6 octahedra, corners with two equivalent Nb(1)O5 square pyramids, corners with four equivalent Nb(2)O5 square pyramids, edges with two equivalent Nb(1)O5 square pyramids, and faces with two equivalent La(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are six inequivalent O sites. In the first O site, O(4) is bonded to one La(1), one Nb(2), and two equivalent Nb(1) atoms to form distorted corner-sharing OLaNb3 tetrahedra. In the second O site, O(5) is bonded in a distorted T-shaped geometry to one La(1), one Nb(1), one Nb(2), and one Nb(3) atom. In the third O site, O(6) is bonded in a linear geometry to two equivalent La(1) and two equivalent Nb(3) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Nb(3) and two equivalent Nb(1) atoms. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one La(1), one Nb(1), one Nb(2), and one Nb(3) atom. In the sixth O site, O(3) is bonded in a square co-planar geometry to four equivalent Nb(1) atoms. is represented by the CIF file [CIF]
data_LaNb8O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.046
_cell_length_b   9.288
_cell_length_c   10.411
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   584.624
_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
  La  La0  1  0.500  0.000  0.000  1.0
  La  La1  1  0.500  0.500  0.500  1.0
  Nb  Nb2  1  0.269  0.126  0.423  1.0
  Nb  Nb3  1  0.731  0.874  0.577  1.0
  Nb  Nb4  1  0.269  0.874  0.577  1.0
  Nb  Nb5  1  0.731  0.374  0.923  1.0
  Nb  Nb6  1  0.731  0.126  0.423  1.0
  Nb  Nb7  1  0.269  0.626  0.077  1.0
  Nb  Nb8  1  0.731  0.626  0.077  1.0
  Nb  Nb9  1  0.269  0.374  0.923  1.0
  Nb  Nb10  1  0.500  0.380  0.164  1.0
  Nb  Nb11  1  0.500  0.620  0.836  1.0
  Nb  Nb12  1  0.500  0.120  0.664  1.0
  Nb  Nb13  1  0.500  0.880  0.336  1.0
  Nb  Nb14  1  0.000  0.115  0.165  1.0
  Nb  Nb15  1  0.000  0.885  0.835  1.0
  Nb  Nb16  1  0.000  0.385  0.665  1.0
  Nb  Nb17  1  0.000  0.615  0.335  1.0
  O  O18  1  0.000  0.235  0.321  1.0
  O  O19  1  0.000  0.765  0.679  1.0
  O  O20  1  0.000  0.265  0.821  1.0
  O  O21  1  0.000  0.735  0.179  1.0
  O  O22  1  0.261  0.234  0.083  1.0
  O  O23  1  0.739  0.766  0.917  1.0
  O  O24  1  0.261  0.766  0.917  1.0
  O  O25  1  0.739  0.266  0.583  1.0
  O  O26  1  0.739  0.234  0.083  1.0
  O  O27  1  0.261  0.734  0.417  1.0
  O  O28  1  0.739  0.734  0.417  1.0
  O  O29  1  0.261  0.266  0.583  1.0
  O  O30  1  0.000  0.000  0.500  1.0
  O  O31  1  0.000  0.500  0.000  1.0
  O  O32  1  0.500  0.272  0.353  1.0
  O  O33  1  0.500  0.728  0.647  1.0
  O  O34  1  0.500  0.228  0.853  1.0
  O  O35  1  0.500  0.772  0.147  1.0
  O  O36  1  0.257  0.004  0.246  1.0
  O  O37  1  0.743  0.996  0.754  1.0
  O  O38  1  0.257  0.996  0.754  1.0
  O  O39  1  0.743  0.496  0.746  1.0
  O  O40  1  0.743  0.004  0.246  1.0
  O  O41  1  0.257  0.504  0.254  1.0
  O  O42  1  0.743  0.504  0.254  1.0
  O  O43  1  0.257  0.496  0.746  1.0
  O  O44  1  0.000  0.000  0.000  1.0
  O  O45  1  0.000  0.500  0.500  1.0
[/CIF]
.