The structure described by Nb10N11O crystallizes in the monoclinic Pc space group. There are ten inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one N(1), one N(5), one N(6), one N(7), one N(8), and one N(9) atom to form distorted NbN6 pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(10)N6 pentagonal pyramids, and edges with three equivalent Nb(5)N6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 1-3°. In the second Nb site, Nb(2) is bonded to one N(10), one N(11), one N(2), one N(3), one N(4), and one O(1) atom to form distorted NbN5O pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(6)N5O pentagonal pyramids, and edges with three equivalent Nb(7)N5O pentagonal pyramids. The corner-sharing octahedral tilt angles range from 3-6°. In the third Nb site, Nb(3) is bonded to one N(11), one N(2), one N(4), one N(5), one N(7), and one N(8) atom to form NbN6 octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(8)N5O octahedra, edges with two equivalent Nb(9)N6 octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the fourth Nb site, Nb(4) is bonded to one N(1), one N(10), one N(3), one N(6), one N(9), and one O(1) atom to form NbN5O octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(9)N6 octahedra, edges with two equivalent Nb(8)N5O octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the fifth Nb site, Nb(5) is bonded to one N(1), one N(5), one N(6), one N(7), one N(8), and one N(9) atom to form distorted NbN6 pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(1)N6 pentagonal pyramids, and edges with three equivalent Nb(10)N6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 1-7°. In the sixth Nb site, Nb(6) is bonded to one N(10), one N(11), one N(2), one N(3), one N(4), and one O(1) atom to form distorted NbN5O pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(2)N5O pentagonal pyramids, and edges with three equivalent Nb(7)N5O pentagonal pyramids. The corner-sharing octahedral tilt angles range from 2-4°. In the seventh Nb site, Nb(7) is bonded to one N(10), one N(11), one N(2), one N(3), one N(4), and one O(1) atom to form distorted NbN5O pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(2)N5O pentagonal pyramids, and edges with three equivalent Nb(6)N5O pentagonal pyramids. The corner-sharing octahedral tilt angles range from 2-3°. In the eighth Nb site, Nb(8) is bonded to one N(1), one N(2), one N(3), one N(6), one N(8), and one O(1) atom to form NbN5O octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(3)N6 octahedra, edges with two equivalent Nb(4)N5O octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the ninth Nb site, Nb(9) is bonded to one N(10), one N(11), one N(4), one N(5), one N(7), and one N(9) atom to form NbN6 octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(4)N5O octahedra, edges with two equivalent Nb(3)N6 octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the tenth Nb site, Nb(10) is bonded to one N(1), one N(5), one N(6), one N(7), one N(8), and one N(9) atom to form distorted NbN6 pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(1)N6 pentagonal pyramids, and edges with three equivalent Nb(5)N6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 2-7°. There are eleven inequivalent N sites. In the first N site, N(1) is bonded to one Nb(1), one Nb(10), one Nb(4), one Nb(5), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(10)Nb5 square pyramid,  a cornercorner with one N(2)Nb5 square pyramid,  a cornercorner with one N(6)Nb5 square pyramid, corners with two equivalent N(3)Nb5 square pyramids, corners with two equivalent N(8)Nb5 square pyramids, corners with two equivalent N(9)Nb5 square pyramids, corners with three equivalent N(5)Nb5 square pyramids,  an edgeedge with one N(8)Nb5 square pyramid,  an edgeedge with one N(9)Nb5 square pyramid,  an edgeedge with one O(1)Nb5 square pyramid, edges with two equivalent N(6)Nb5 square pyramids, and  a faceface with one N(7)Nb5 square pyramid. In the second N site, N(2) is bonded to one Nb(2), one Nb(3), one Nb(6), one Nb(7), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(1)Nb5 square pyramid,  a cornercorner with one N(5)Nb5 square pyramid,  a cornercorner with one N(6)Nb5 square pyramid,  a cornercorner with one N(7)Nb5 square pyramid, corners with two equivalent N(11)Nb5 square pyramids, corners with two equivalent N(3)Nb5 square pyramids, corners with two equivalent N(4)Nb5 square pyramids, corners with two equivalent O(1)Nb5 square pyramids,  an edgeedge with one N(11)Nb5 square pyramid,  an edgeedge with one N(3)Nb5 square pyramid,  an edgeedge with one N(4)Nb5 square pyramid,  an edgeedge with one N(8)Nb5 square pyramid,  an edgeedge with one O(1)Nb5 square pyramid, and  a faceface with one N(10)Nb5 square pyramid. In the third N site, N(3) is bonded to one Nb(2), one Nb(4), one Nb(6), one Nb(7), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid,  a cornercorner with one O(1)Nb5 square pyramid, corners with two equivalent N(1)Nb5 square pyramids, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with three equivalent N(11)Nb5 square pyramids,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(6)Nb5 square pyramid, edges with two equivalent O(1)Nb5 square pyramids, and  a faceface with one N(4)Nb5 square pyramid. In the fourth N site, N(4) is bonded to one Nb(2), one Nb(3), one Nb(6), one Nb(7), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(11)Nb5 square pyramid,  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with two equivalent N(7)Nb5 square pyramids, corners with three equivalent O(1)Nb5 square pyramids,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(5)Nb5 square pyramid, edges with two equivalent N(11)Nb5 square pyramids, and  a faceface with one N(3)Nb5 square pyramid. In the fifth N site, N(5) is bonded to one Nb(1), one Nb(10), one Nb(3), one Nb(5), and one Nb(9) atom to form a mixture of edge, corner, and face-sharing NNb5 square pyramids. In the sixth N site, N(6) is bonded to one Nb(1), one Nb(10), one Nb(4), one Nb(5), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(1)Nb5 square pyramid,  a cornercorner with one N(10)Nb5 square pyramid,  a cornercorner with one N(2)Nb5 square pyramid, corners with two equivalent N(8)Nb5 square pyramids, corners with two equivalent N(9)Nb5 square pyramids, corners with two equivalent O(1)Nb5 square pyramids, corners with three equivalent N(7)Nb5 square pyramids,  an edgeedge with one N(3)Nb5 square pyramid,  an edgeedge with one N(8)Nb5 square pyramid,  an edgeedge with one N(9)Nb5 square pyramid, edges with two equivalent N(1)Nb5 square pyramids, and  a faceface with one N(5)Nb5 square pyramid. In the seventh N site, N(7) is bonded to one Nb(1), one Nb(10), one Nb(3), one Nb(5), and one Nb(9) atom to form a mixture of edge, corner, and face-sharing NNb5 square pyramids. In the eighth N site, N(8) is bonded to one Nb(1), one Nb(10), one Nb(3), one Nb(5), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(11)Nb5 square pyramid,  a cornercorner with one N(3)Nb5 square pyramid,  a cornercorner with one N(4)Nb5 square pyramid,  a cornercorner with one O(1)Nb5 square pyramid, corners with two equivalent N(1)Nb5 square pyramids, corners with two equivalent N(5)Nb5 square pyramids, corners with two equivalent N(6)Nb5 square pyramids, corners with two equivalent N(7)Nb5 square pyramids,  an edgeedge with one N(1)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(5)Nb5 square pyramid,  an edgeedge with one N(6)Nb5 square pyramid,  an edgeedge with one N(7)Nb5 square pyramid, and  a faceface with one N(9)Nb5 square pyramid. In the ninth N site, N(9) is bonded to one Nb(1), one Nb(10), one Nb(4), one Nb(5), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(11)Nb5 square pyramid,  a cornercorner with one N(3)Nb5 square pyramid,  a cornercorner with one N(4)Nb5 square pyramid,  a cornercorner with one O(1)Nb5 square pyramid, corners with two equivalent N(1)Nb5 square pyramids, corners with two equivalent N(5)Nb5 square pyramids, corners with two equivalent N(6)Nb5 square pyramids, corners with two equivalent N(7)Nb5 square pyramids,  an edgeedge with one N(1)Nb5 square pyramid,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(5)Nb5 square pyramid,  an edgeedge with one N(6)Nb5 square pyramid,  an edgeedge with one N(7)Nb5 square pyramid, and  a faceface with one N(8)Nb5 square pyramid. In the tenth N site, N(10) is bonded to one Nb(2), one Nb(4), one Nb(6), one Nb(7), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(1)Nb5 square pyramid,  a cornercorner with one N(5)Nb5 square pyramid,  a cornercorner with one N(6)Nb5 square pyramid,  a cornercorner with one N(7)Nb5 square pyramid, corners with two equivalent N(11)Nb5 square pyramids, corners with two equivalent N(3)Nb5 square pyramids, corners with two equivalent N(4)Nb5 square pyramids, corners with two equivalent O(1)Nb5 square pyramids,  an edgeedge with one N(11)Nb5 square pyramid,  an edgeedge with one N(3)Nb5 square pyramid,  an edgeedge with one N(4)Nb5 square pyramid,  an edgeedge with one N(9)Nb5 square pyramid,  an edgeedge with one O(1)Nb5 square pyramid, and  a faceface with one N(2)Nb5 square pyramid. In the eleventh N site, N(11) is bonded to one Nb(2), one Nb(3), one Nb(6), one Nb(7), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(4)Nb5 square pyramid,  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with two equivalent N(5)Nb5 square pyramids, corners with three equivalent N(3)Nb5 square pyramids,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(7)Nb5 square pyramid, edges with two equivalent N(4)Nb5 square pyramids, and  a faceface with one O(1)Nb5 square pyramid. O(1) is bonded to one Nb(2), one Nb(4), one Nb(6), one Nb(7), and one Nb(8) atom to form ONb5 square pyramids that share  a cornercorner with one N(3)Nb5 square pyramid,  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with two equivalent N(6)Nb5 square pyramids, corners with three equivalent N(4)Nb5 square pyramids,  an edgeedge with one N(1)Nb5 square pyramid,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid, edges with two equivalent N(3)Nb5 square pyramids, and  a faceface with one N(11)Nb5 square pyramid. is represented by the CIF card [CIF]
data_Nb10N11O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.551
_cell_length_b   5.257
_cell_length_c   10.511
_cell_angle_alpha   60.250
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   506.170
_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  0.500  0.675  0.162  1.0
  Nb  Nb1  1  0.999  0.325  0.338  1.0
  Nb  Nb2  1  0.755  0.332  0.167  1.0
  Nb  Nb3  1  0.260  0.309  0.169  1.0
  Nb  Nb4  1  0.503  0.002  0.337  1.0
  Nb  Nb5  1  0.002  0.678  0.496  1.0
  Nb  Nb6  1  0.998  0.008  0.161  1.0
  Nb  Nb7  1  0.001  0.325  0.838  1.0
  Nb  Nb8  1  0.245  0.332  0.667  1.0
  Nb  Nb9  1  0.256  0.667  0.345  1.0
  Nb  Nb10  1  0.740  0.309  0.669  1.0
  Nb  Nb11  1  0.750  0.663  0.334  1.0
  Nb  Nb12  1  0.497  0.002  0.837  1.0
  Nb  Nb13  1  0.499  0.325  0.499  1.0
  Nb  Nb14  1  0.998  0.678  0.996  1.0
  Nb  Nb15  1  0.002  0.008  0.661  1.0
  Nb  Nb16  1  0.250  0.663  0.834  1.0
  Nb  Nb17  1  0.744  0.667  0.845  1.0
  Nb  Nb18  1  0.500  0.675  0.662  1.0
  Nb  Nb19  1  0.501  0.325  0.999  1.0
  N  N20  1  0.372  0.341  0.329  1.0
  N  N21  1  0.874  0.342  0.997  1.0
  N  N22  1  0.127  0.003  0.329  1.0
  N  N23  1  0.874  0.002  0.331  1.0
  N  N24  1  0.630  0.001  0.169  1.0
  N  N25  1  0.376  0.997  0.168  1.0
  N  N26  1  0.373  0.344  0.829  1.0
  N  N27  1  0.374  0.664  0.501  1.0
  N  N28  1  0.628  0.659  0.500  1.0
  N  N29  1  0.126  0.342  0.497  1.0
  N  N30  1  0.872  0.339  0.501  1.0
  N  N31  1  0.877  0.664  0.169  1.0
  N  N32  1  0.126  0.002  0.831  1.0
  N  N33  1  0.873  0.003  0.829  1.0
  N  N34  1  0.627  0.344  0.329  1.0
  N  N35  1  0.624  0.997  0.668  1.0
  N  N36  1  0.370  0.001  0.669  1.0
  N  N37  1  0.372  0.659  1.000  1.0
  N  N38  1  0.626  0.664  0.001  1.0
  N  N39  1  0.128  0.339  0.001  1.0
  N  N40  1  0.123  0.664  0.669  1.0
  N  N41  1  0.628  0.341  0.829  1.0
  O  O42  1  0.129  0.660  0.170  1.0
  O  O43  1  0.871  0.660  0.670  1.0
[/CIF]
.
The structure described by Nb10N11O crystallizes in the monoclinic Pc space group. There are ten inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one N(1), one N(5), one N(6), one N(7), one N(8), and one N(9) atom to form distorted NbN6 pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(10)N6 pentagonal pyramids, and edges with three equivalent Nb(5)N6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 1-3°. In the second Nb site, Nb(2) is bonded to one N(10), one N(11), one N(2), one N(3), one N(4), and one O(1) atom to form distorted NbN5O pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(6)N5O pentagonal pyramids, and edges with three equivalent Nb(7)N5O pentagonal pyramids. The corner-sharing octahedral tilt angles range from 3-6°. In the third Nb site, Nb(3) is bonded to one N(11), one N(2), one N(4), one N(5), one N(7), and one N(8) atom to form NbN6 octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(8)N5O octahedra, edges with two equivalent Nb(9)N6 octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the fourth Nb site, Nb(4) is bonded to one N(1), one N(10), one N(3), one N(6), one N(9), and one O(1) atom to form NbN5O octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(9)N6 octahedra, edges with two equivalent Nb(8)N5O octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the fifth Nb site, Nb(5) is bonded to one N(1), one N(5), one N(6), one N(7), one N(8), and one N(9) atom to form distorted NbN6 pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(1)N6 pentagonal pyramids, and edges with three equivalent Nb(10)N6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 1-7°. In the sixth Nb site, Nb(6) is bonded to one N(10), one N(11), one N(2), one N(3), one N(4), and one O(1) atom to form distorted NbN5O pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(2)N5O pentagonal pyramids, and edges with three equivalent Nb(7)N5O pentagonal pyramids. The corner-sharing octahedral tilt angles range from 2-4°. In the seventh Nb site, Nb(7) is bonded to one N(10), one N(11), one N(2), one N(3), one N(4), and one O(1) atom to form distorted NbN5O pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(2)N5O pentagonal pyramids, and edges with three equivalent Nb(6)N5O pentagonal pyramids. The corner-sharing octahedral tilt angles range from 2-3°. In the eighth Nb site, Nb(8) is bonded to one N(1), one N(2), one N(3), one N(6), one N(8), and one O(1) atom to form NbN5O octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(3)N6 octahedra, edges with two equivalent Nb(4)N5O octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the ninth Nb site, Nb(9) is bonded to one N(10), one N(11), one N(4), one N(5), one N(7), and one N(9) atom to form NbN6 octahedra that share  a cornercorner with one Nb(2)N5O pentagonal pyramid,  a cornercorner with one Nb(6)N5O pentagonal pyramid,  a cornercorner with one Nb(7)N5O pentagonal pyramid,  a cornercorner with one Nb(1)N6 pentagonal pyramid,  a cornercorner with one Nb(10)N6 pentagonal pyramid,  a cornercorner with one Nb(5)N6 pentagonal pyramid,  an edgeedge with one Nb(4)N5O octahedra, edges with two equivalent Nb(3)N6 octahedra,  an edgeedge with one Nb(2)N5O pentagonal pyramid,  an edgeedge with one Nb(6)N5O pentagonal pyramid,  an edgeedge with one Nb(7)N5O pentagonal pyramid,  an edgeedge with one Nb(1)N6 pentagonal pyramid,  an edgeedge with one Nb(10)N6 pentagonal pyramid, and  an edgeedge with one Nb(5)N6 pentagonal pyramid. In the tenth Nb site, Nb(10) is bonded to one N(1), one N(5), one N(6), one N(7), one N(8), and one N(9) atom to form distorted NbN6 pentagonal pyramids that share  a cornercorner with one Nb(4)N5O octahedra,  a cornercorner with one Nb(8)N5O octahedra,  a cornercorner with one Nb(3)N6 octahedra,  a cornercorner with one Nb(9)N6 octahedra,  an edgeedge with one Nb(4)N5O octahedra,  an edgeedge with one Nb(8)N5O octahedra,  an edgeedge with one Nb(3)N6 octahedra,  an edgeedge with one Nb(9)N6 octahedra, edges with three equivalent Nb(1)N6 pentagonal pyramids, and edges with three equivalent Nb(5)N6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 2-7°. There are eleven inequivalent N sites. In the first N site, N(1) is bonded to one Nb(1), one Nb(10), one Nb(4), one Nb(5), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(10)Nb5 square pyramid,  a cornercorner with one N(2)Nb5 square pyramid,  a cornercorner with one N(6)Nb5 square pyramid, corners with two equivalent N(3)Nb5 square pyramids, corners with two equivalent N(8)Nb5 square pyramids, corners with two equivalent N(9)Nb5 square pyramids, corners with three equivalent N(5)Nb5 square pyramids,  an edgeedge with one N(8)Nb5 square pyramid,  an edgeedge with one N(9)Nb5 square pyramid,  an edgeedge with one O(1)Nb5 square pyramid, edges with two equivalent N(6)Nb5 square pyramids, and  a faceface with one N(7)Nb5 square pyramid. In the second N site, N(2) is bonded to one Nb(2), one Nb(3), one Nb(6), one Nb(7), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(1)Nb5 square pyramid,  a cornercorner with one N(5)Nb5 square pyramid,  a cornercorner with one N(6)Nb5 square pyramid,  a cornercorner with one N(7)Nb5 square pyramid, corners with two equivalent N(11)Nb5 square pyramids, corners with two equivalent N(3)Nb5 square pyramids, corners with two equivalent N(4)Nb5 square pyramids, corners with two equivalent O(1)Nb5 square pyramids,  an edgeedge with one N(11)Nb5 square pyramid,  an edgeedge with one N(3)Nb5 square pyramid,  an edgeedge with one N(4)Nb5 square pyramid,  an edgeedge with one N(8)Nb5 square pyramid,  an edgeedge with one O(1)Nb5 square pyramid, and  a faceface with one N(10)Nb5 square pyramid. In the third N site, N(3) is bonded to one Nb(2), one Nb(4), one Nb(6), one Nb(7), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid,  a cornercorner with one O(1)Nb5 square pyramid, corners with two equivalent N(1)Nb5 square pyramids, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with three equivalent N(11)Nb5 square pyramids,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(6)Nb5 square pyramid, edges with two equivalent O(1)Nb5 square pyramids, and  a faceface with one N(4)Nb5 square pyramid. In the fourth N site, N(4) is bonded to one Nb(2), one Nb(3), one Nb(6), one Nb(7), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(11)Nb5 square pyramid,  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with two equivalent N(7)Nb5 square pyramids, corners with three equivalent O(1)Nb5 square pyramids,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(5)Nb5 square pyramid, edges with two equivalent N(11)Nb5 square pyramids, and  a faceface with one N(3)Nb5 square pyramid. In the fifth N site, N(5) is bonded to one Nb(1), one Nb(10), one Nb(3), one Nb(5), and one Nb(9) atom to form a mixture of edge, corner, and face-sharing NNb5 square pyramids. In the sixth N site, N(6) is bonded to one Nb(1), one Nb(10), one Nb(4), one Nb(5), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(1)Nb5 square pyramid,  a cornercorner with one N(10)Nb5 square pyramid,  a cornercorner with one N(2)Nb5 square pyramid, corners with two equivalent N(8)Nb5 square pyramids, corners with two equivalent N(9)Nb5 square pyramids, corners with two equivalent O(1)Nb5 square pyramids, corners with three equivalent N(7)Nb5 square pyramids,  an edgeedge with one N(3)Nb5 square pyramid,  an edgeedge with one N(8)Nb5 square pyramid,  an edgeedge with one N(9)Nb5 square pyramid, edges with two equivalent N(1)Nb5 square pyramids, and  a faceface with one N(5)Nb5 square pyramid. In the seventh N site, N(7) is bonded to one Nb(1), one Nb(10), one Nb(3), one Nb(5), and one Nb(9) atom to form a mixture of edge, corner, and face-sharing NNb5 square pyramids. In the eighth N site, N(8) is bonded to one Nb(1), one Nb(10), one Nb(3), one Nb(5), and one Nb(8) atom to form NNb5 square pyramids that share  a cornercorner with one N(11)Nb5 square pyramid,  a cornercorner with one N(3)Nb5 square pyramid,  a cornercorner with one N(4)Nb5 square pyramid,  a cornercorner with one O(1)Nb5 square pyramid, corners with two equivalent N(1)Nb5 square pyramids, corners with two equivalent N(5)Nb5 square pyramids, corners with two equivalent N(6)Nb5 square pyramids, corners with two equivalent N(7)Nb5 square pyramids,  an edgeedge with one N(1)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(5)Nb5 square pyramid,  an edgeedge with one N(6)Nb5 square pyramid,  an edgeedge with one N(7)Nb5 square pyramid, and  a faceface with one N(9)Nb5 square pyramid. In the ninth N site, N(9) is bonded to one Nb(1), one Nb(10), one Nb(4), one Nb(5), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(11)Nb5 square pyramid,  a cornercorner with one N(3)Nb5 square pyramid,  a cornercorner with one N(4)Nb5 square pyramid,  a cornercorner with one O(1)Nb5 square pyramid, corners with two equivalent N(1)Nb5 square pyramids, corners with two equivalent N(5)Nb5 square pyramids, corners with two equivalent N(6)Nb5 square pyramids, corners with two equivalent N(7)Nb5 square pyramids,  an edgeedge with one N(1)Nb5 square pyramid,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(5)Nb5 square pyramid,  an edgeedge with one N(6)Nb5 square pyramid,  an edgeedge with one N(7)Nb5 square pyramid, and  a faceface with one N(8)Nb5 square pyramid. In the tenth N site, N(10) is bonded to one Nb(2), one Nb(4), one Nb(6), one Nb(7), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(1)Nb5 square pyramid,  a cornercorner with one N(5)Nb5 square pyramid,  a cornercorner with one N(6)Nb5 square pyramid,  a cornercorner with one N(7)Nb5 square pyramid, corners with two equivalent N(11)Nb5 square pyramids, corners with two equivalent N(3)Nb5 square pyramids, corners with two equivalent N(4)Nb5 square pyramids, corners with two equivalent O(1)Nb5 square pyramids,  an edgeedge with one N(11)Nb5 square pyramid,  an edgeedge with one N(3)Nb5 square pyramid,  an edgeedge with one N(4)Nb5 square pyramid,  an edgeedge with one N(9)Nb5 square pyramid,  an edgeedge with one O(1)Nb5 square pyramid, and  a faceface with one N(2)Nb5 square pyramid. In the eleventh N site, N(11) is bonded to one Nb(2), one Nb(3), one Nb(6), one Nb(7), and one Nb(9) atom to form NNb5 square pyramids that share  a cornercorner with one N(4)Nb5 square pyramid,  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with two equivalent N(5)Nb5 square pyramids, corners with three equivalent N(3)Nb5 square pyramids,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid,  an edgeedge with one N(7)Nb5 square pyramid, edges with two equivalent N(4)Nb5 square pyramids, and  a faceface with one O(1)Nb5 square pyramid. O(1) is bonded to one Nb(2), one Nb(4), one Nb(6), one Nb(7), and one Nb(8) atom to form ONb5 square pyramids that share  a cornercorner with one N(3)Nb5 square pyramid,  a cornercorner with one N(8)Nb5 square pyramid,  a cornercorner with one N(9)Nb5 square pyramid, corners with two equivalent N(10)Nb5 square pyramids, corners with two equivalent N(2)Nb5 square pyramids, corners with two equivalent N(6)Nb5 square pyramids, corners with three equivalent N(4)Nb5 square pyramids,  an edgeedge with one N(1)Nb5 square pyramid,  an edgeedge with one N(10)Nb5 square pyramid,  an edgeedge with one N(2)Nb5 square pyramid, edges with two equivalent N(3)Nb5 square pyramids, and  a faceface with one N(11)Nb5 square pyramid. is represented by the CIF card [CIF]
data_Nb10N11O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.551
_cell_length_b   5.257
_cell_length_c   10.511
_cell_angle_alpha   60.250
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   506.170
_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  0.500  0.675  0.162  1.0
  Nb  Nb1  1  0.999  0.325  0.338  1.0
  Nb  Nb2  1  0.755  0.332  0.167  1.0
  Nb  Nb3  1  0.260  0.309  0.169  1.0
  Nb  Nb4  1  0.503  0.002  0.337  1.0
  Nb  Nb5  1  0.002  0.678  0.496  1.0
  Nb  Nb6  1  0.998  0.008  0.161  1.0
  Nb  Nb7  1  0.001  0.325  0.838  1.0
  Nb  Nb8  1  0.245  0.332  0.667  1.0
  Nb  Nb9  1  0.256  0.667  0.345  1.0
  Nb  Nb10  1  0.740  0.309  0.669  1.0
  Nb  Nb11  1  0.750  0.663  0.334  1.0
  Nb  Nb12  1  0.497  0.002  0.837  1.0
  Nb  Nb13  1  0.499  0.325  0.499  1.0
  Nb  Nb14  1  0.998  0.678  0.996  1.0
  Nb  Nb15  1  0.002  0.008  0.661  1.0
  Nb  Nb16  1  0.250  0.663  0.834  1.0
  Nb  Nb17  1  0.744  0.667  0.845  1.0
  Nb  Nb18  1  0.500  0.675  0.662  1.0
  Nb  Nb19  1  0.501  0.325  0.999  1.0
  N  N20  1  0.372  0.341  0.329  1.0
  N  N21  1  0.874  0.342  0.997  1.0
  N  N22  1  0.127  0.003  0.329  1.0
  N  N23  1  0.874  0.002  0.331  1.0
  N  N24  1  0.630  0.001  0.169  1.0
  N  N25  1  0.376  0.997  0.168  1.0
  N  N26  1  0.373  0.344  0.829  1.0
  N  N27  1  0.374  0.664  0.501  1.0
  N  N28  1  0.628  0.659  0.500  1.0
  N  N29  1  0.126  0.342  0.497  1.0
  N  N30  1  0.872  0.339  0.501  1.0
  N  N31  1  0.877  0.664  0.169  1.0
  N  N32  1  0.126  0.002  0.831  1.0
  N  N33  1  0.873  0.003  0.829  1.0
  N  N34  1  0.627  0.344  0.329  1.0
  N  N35  1  0.624  0.997  0.668  1.0
  N  N36  1  0.370  0.001  0.669  1.0
  N  N37  1  0.372  0.659  1.000  1.0
  N  N38  1  0.626  0.664  0.001  1.0
  N  N39  1  0.128  0.339  0.001  1.0
  N  N40  1  0.123  0.664  0.669  1.0
  N  N41  1  0.628  0.341  0.829  1.0
  O  O42  1  0.129  0.660  0.170  1.0
  O  O43  1  0.871  0.660  0.670  1.0
[/CIF]
.