The material described by La2Nb2N2O5 crystallizes in the triclinic P1 space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one N(2), one N(4), one N(8), one O(1), one O(10), one O(3), and one O(6) atom. In the second La site, La(2) is bonded in a 9-coordinate geometry to one N(2), one N(7), one O(11), one O(14), one O(2), one O(20), one O(4), one O(7), and one O(8) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one N(1), one N(3), one O(13), one O(14), one O(4), one O(5), one O(8), and one O(9) atom. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(15), one O(18), one O(3), one O(5), and one O(9) atom. In the fifth La site, La(5) is bonded in a 8-coordinate geometry to one N(4), one N(8), one O(10), one O(12), one O(15), one O(16), one O(19), and one O(6) atom. In the sixth La site, La(6) is bonded in a 8-coordinate geometry to one N(7), one O(11), one O(12), one O(16), one O(17), one O(19), one O(20), and one O(7) atom. In the seventh La site, La(7) is bonded in a 9-coordinate geometry to one N(1), one N(3), one N(5), one N(6), one O(11), one O(14), one O(17), one O(20), and one O(4) atom. In the eighth La site, La(8) is bonded in a 7-coordinate geometry to one N(4), one N(6), one N(8), one O(1), one O(15), one O(18), and one O(3) atom. There are eight inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one N(1), one N(6), one O(1), one O(3), one O(5), and one O(9) atom to form corner-sharing NbN2O4 octahedra. The corner-sharing octahedral tilt angles range from 20-36°. In the second Nb site, Nb(2) is bonded to one N(1), one N(5), one O(20), one O(4), one O(5), and one O(8) atom to form NbN2O4 octahedra that share corners with two equivalent Nb(1)N2O4 octahedra, corners with two equivalent Nb(5)N2O4 octahedra, and corners with two equivalent Nb(7)NO5 octahedra. The corner-sharing octahedral tilt angles range from 24-36°. In the third Nb site, Nb(3) is bonded to one N(2), one O(10), one O(12), one O(16), one O(6), and one O(7) atom to form distorted NbNO5 octahedra that share corners with two equivalent Nb(8)N4O2 octahedra and corners with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-39°. In the fourth Nb site, Nb(4) is bonded to one O(11), one O(12), one O(14), one O(17), one O(2), and one O(7) atom to form NbO6 octahedra that share corners with two equivalent Nb(5)N2O4 octahedra, corners with two equivalent Nb(3)NO5 octahedra, and corners with two equivalent Nb(7)NO5 octahedra. The corner-sharing octahedral tilt angles range from 24-39°. In the fifth Nb site, Nb(5) is bonded to one N(3), one N(5), one O(11), one O(13), one O(14), and one O(8) atom to form distorted NbN2O4 octahedra that share corners with two equivalent Nb(2)N2O4 octahedra, corners with two equivalent Nb(6)N2O4 octahedra, and corners with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-41°. In the sixth Nb site, Nb(6) is bonded to one N(3), one N(6), one O(13), one O(15), one O(18), and one O(9) atom to form distorted corner-sharing NbN2O4 octahedra. The corner-sharing octahedral tilt angles range from 20-41°. In the seventh Nb site, Nb(7) is bonded to one N(7), one O(17), one O(19), one O(2), one O(20), and one O(4) atom to form NbNO5 octahedra that share corners with two equivalent Nb(2)N2O4 octahedra, corners with two equivalent Nb(8)N4O2 octahedra, and corners with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-40°. In the eighth Nb site, Nb(8) is bonded to one N(2), one N(4), one N(7), one N(8), one O(16), and one O(19) atom to form distorted corner-sharing NbN4O2 octahedra. The corner-sharing octahedral tilt angles range from 28-40°. There are eight inequivalent N sites. In the first N site, N(1) is bonded to one La(3), one La(7), one Nb(1), and one Nb(2) atom to form distorted NLa2Nb2 tetrahedra that share  a cornercorner with one O(17)La2Nb2 tetrahedra,  a cornercorner with one O(1)La3Nb tetrahedra,  a cornercorner with one O(3)La3Nb tetrahedra, corners with two equivalent N(3)La2Nb2 tetrahedra, and  an edgeedge with one O(8)La2Nb2 tetrahedra. In the second N site, N(2) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Nb(3), and one Nb(8) atom. In the third N site, N(3) is bonded to one La(3), one La(7), one Nb(5), and one Nb(6) atom to form distorted NLa2Nb2 tetrahedra that share  a cornercorner with one O(17)La2Nb2 tetrahedra,  a cornercorner with one O(15)La3Nb tetrahedra, corners with two equivalent N(1)La2Nb2 tetrahedra, and  an edgeedge with one O(8)La2Nb2 tetrahedra. In the fourth N site, N(4) is bonded to one La(1), one La(5), one La(8), and one Nb(8) atom to form distorted NLa3Nb tetrahedra that share  a cornercorner with one N(7)La2Nb2 tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra, corners with two equivalent O(3)La3Nb tetrahedra,  an edgeedge with one O(1)La3Nb tetrahedra, and edges with two equivalent N(8)La3Nb tetrahedra. In the fifth N site, N(5) is bonded in a 3-coordinate geometry to one La(7), one Nb(2), and one Nb(5) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one La(7), one La(8), one Nb(1), and one Nb(6) atom. In the seventh N site, N(7) is bonded to one La(2), one La(6), one Nb(7), and one Nb(8) atom to form distorted NLa2Nb2 tetrahedra that share  a cornercorner with one N(4)La3Nb tetrahedra,  a cornercorner with one N(8)La3Nb tetrahedra,  a cornercorner with one O(8)La2Nb2 tetrahedra, corners with two equivalent O(7)La2Nb2 tetrahedra, and  an edgeedge with one O(17)La2Nb2 tetrahedra. In the eighth N site, N(8) is bonded to one La(1), one La(5), one La(8), and one Nb(8) atom to form NLa3Nb tetrahedra that share  a cornercorner with one N(7)La2Nb2 tetrahedra, corners with two equivalent O(1)La3Nb tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra,  an edgeedge with one O(15)La3Nb tetrahedra,  an edgeedge with one O(3)La3Nb tetrahedra, and edges with two equivalent N(4)La3Nb tetrahedra. There are twenty inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(4), one La(8), and one Nb(1) atom to form OLa3Nb tetrahedra that share  a cornercorner with one N(1)La2Nb2 tetrahedra, corners with two equivalent N(8)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra,  an edgeedge with one N(4)La3Nb tetrahedra,  an edgeedge with one O(10)La3Nb tetrahedra, and edges with two equivalent O(3)La3Nb tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(2), one Nb(4), and one Nb(7) atom. In the third O site, O(3) is bonded to one La(1), one La(4), one La(8), and one Nb(1) atom to form distorted OLa3Nb tetrahedra that share  a cornercorner with one N(1)La2Nb2 tetrahedra, corners with two equivalent N(4)La3Nb tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra,  an edgeedge with one N(8)La3Nb tetrahedra, and edges with two equivalent O(1)La3Nb tetrahedra. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(7), one Nb(2), and one Nb(7) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Nb(1), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one La(1), one La(5), and one Nb(3) atom. In the seventh O site, O(7) is bonded to one La(2), one La(6), one Nb(3), and one Nb(4) atom to form distorted OLa2Nb2 tetrahedra that share  a cornercorner with one O(8)La2Nb2 tetrahedra,  a cornercorner with one O(10)La3Nb tetrahedra, corners with two equivalent N(7)La2Nb2 tetrahedra, and  an edgeedge with one O(17)La2Nb2 tetrahedra. In the eighth O site, O(8) is bonded to one La(2), one La(3), one Nb(2), and one Nb(5) atom to form distorted OLa2Nb2 tetrahedra that share  a cornercorner with one N(7)La2Nb2 tetrahedra,  a cornercorner with one O(7)La2Nb2 tetrahedra,  an edgeedge with one N(1)La2Nb2 tetrahedra, and  an edgeedge with one N(3)La2Nb2 tetrahedra. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Nb(1), and one Nb(6) atom. In the tenth O site, O(10) is bonded to one La(1), one La(4), one La(5), and one Nb(3) atom to form distorted OLa3Nb tetrahedra that share  a cornercorner with one O(7)La2Nb2 tetrahedra, corners with two equivalent N(4)La3Nb tetrahedra, corners with two equivalent N(8)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra, corners with two equivalent O(3)La3Nb tetrahedra, and  an edgeedge with one O(1)La3Nb tetrahedra. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one La(2), one La(6), one La(7), one Nb(4), and one Nb(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(5), one La(6), one Nb(3), and one Nb(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Nb(5), and one Nb(6) atom. In the fourteenth O site, O(14) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(7), one Nb(4), and one Nb(5) atom. In the fifteenth O site, O(15) is bonded to one La(4), one La(5), one La(8), and one Nb(6) atom to form distorted OLa3Nb tetrahedra that share  a cornercorner with one N(3)La2Nb2 tetrahedra, corners with two equivalent N(4)La3Nb tetrahedra, corners with two equivalent O(1)La3Nb tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra, corners with two equivalent O(3)La3Nb tetrahedra, and  an edgeedge with one N(8)La3Nb tetrahedra. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one La(5), one La(6), one Nb(3), and one Nb(8) atom. In the seventeenth O site, O(17) is bonded to one La(6), one La(7), one Nb(4), and one Nb(7) atom to form distorted OLa2Nb2 tetrahedra that share  a cornercorner with one N(1)La2Nb2 tetrahedra,  a cornercorner with one N(3)La2Nb2 tetrahedra,  an edgeedge with one N(7)La2Nb2 tetrahedra, and  an edgeedge with one O(7)La2Nb2 tetrahedra. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one La(4), one La(8), and one Nb(6) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one La(5), one La(6), one Nb(7), and one Nb(8) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one La(2), one La(6), one La(7), one Nb(2), and one Nb(7) atom. is represented by the CIF card [CIF]
data_La2Nb2N2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.712
_cell_length_b   8.027
_cell_length_c   13.761
_cell_angle_alpha   98.381
_cell_angle_beta   90.035
_cell_angle_gamma   90.124
_symmetry_Int_Tables_number   1
_cell_volume   624.215
_cell_formula_units_Z   4
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  0.341  0.135  0.571  1.0
  La  La1  1  0.761  0.223  0.908  1.0
  La  La2  1  0.253  0.281  0.123  1.0
  La  La3  1  0.780  0.352  0.389  1.0
  La  La4  1  0.274  0.661  0.608  1.0
  La  La5  1  0.748  0.725  0.879  1.0
  La  La6  1  0.263  0.776  0.096  1.0
  La  La7  1  0.838  0.859  0.432  1.0
  Nb  Nb8  1  0.279  0.063  0.316  1.0
  Nb  Nb9  1  0.752  0.020  0.118  1.0
  Nb  Nb10  1  0.783  0.401  0.675  1.0
  Nb  Nb11  1  0.259  0.473  0.886  1.0
  Nb  Nb12  1  0.751  0.534  0.123  1.0
  Nb  Nb13  1  0.291  0.591  0.321  1.0
  Nb  Nb14  1  0.243  0.971  0.881  1.0
  Nb  Nb15  1  0.788  0.925  0.673  1.0
  N  N16  1  0.451  0.031  0.184  1.0
  N  N17  1  0.689  0.180  0.699  1.0
  N  N18  1  0.445  0.564  0.181  1.0
  N  N19  1  0.559  0.871  0.571  1.0
  N  N20  1  0.820  0.775  0.104  1.0
  N  N21  1  0.194  0.826  0.304  1.0
  N  N22  1  0.949  0.976  0.821  1.0
  N  N23  1  0.051  0.913  0.587  1.0
  O  O24  1  0.546  0.087  0.407  1.0
  O  O25  1  0.324  0.226  0.890  1.0
  O  O26  1  0.055  0.135  0.426  1.0
  O  O27  1  0.050  0.049  0.019  1.0
  O  O28  1  0.965  0.118  0.225  1.0
  O  O29  1  0.077  0.376  0.613  1.0
  O  O30  1  0.946  0.436  0.821  1.0
  O  O31  1  0.678  0.274  0.083  1.0
  O  O32  1  0.343  0.332  0.306  1.0
  O  O33  1  0.585  0.410  0.559  1.0
  O  O34  1  0.531  0.533  0.978  1.0
  O  O35  1  0.452  0.502  0.776  1.0
  O  O36  1  0.956  0.496  0.229  1.0
  O  O37  1  0.043  0.459  0.016  1.0
  O  O38  1  0.074  0.586  0.436  1.0
  O  O39  1  0.847  0.672  0.702  1.0
  O  O40  1  0.176  0.727  0.915  1.0
  O  O41  1  0.576  0.620  0.390  1.0
  O  O42  1  0.451  0.875  0.780  1.0
  O  O43  1  0.549  0.960  0.982  1.0
[/CIF]
.
The material described by La2Nb2N2O5 crystallizes in the triclinic P1 space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one N(2), one N(4), one N(8), one O(1), one O(10), one O(3), and one O(6) atom. In the second La site, La(2) is bonded in a 9-coordinate geometry to one N(2), one N(7), one O(11), one O(14), one O(2), one O(20), one O(4), one O(7), and one O(8) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one N(1), one N(3), one O(13), one O(14), one O(4), one O(5), one O(8), and one O(9) atom. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(15), one O(18), one O(3), one O(5), and one O(9) atom. In the fifth La site, La(5) is bonded in a 8-coordinate geometry to one N(4), one N(8), one O(10), one O(12), one O(15), one O(16), one O(19), and one O(6) atom. In the sixth La site, La(6) is bonded in a 8-coordinate geometry to one N(7), one O(11), one O(12), one O(16), one O(17), one O(19), one O(20), and one O(7) atom. In the seventh La site, La(7) is bonded in a 9-coordinate geometry to one N(1), one N(3), one N(5), one N(6), one O(11), one O(14), one O(17), one O(20), and one O(4) atom. In the eighth La site, La(8) is bonded in a 7-coordinate geometry to one N(4), one N(6), one N(8), one O(1), one O(15), one O(18), and one O(3) atom. There are eight inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one N(1), one N(6), one O(1), one O(3), one O(5), and one O(9) atom to form corner-sharing NbN2O4 octahedra. The corner-sharing octahedral tilt angles range from 20-36°. In the second Nb site, Nb(2) is bonded to one N(1), one N(5), one O(20), one O(4), one O(5), and one O(8) atom to form NbN2O4 octahedra that share corners with two equivalent Nb(1)N2O4 octahedra, corners with two equivalent Nb(5)N2O4 octahedra, and corners with two equivalent Nb(7)NO5 octahedra. The corner-sharing octahedral tilt angles range from 24-36°. In the third Nb site, Nb(3) is bonded to one N(2), one O(10), one O(12), one O(16), one O(6), and one O(7) atom to form distorted NbNO5 octahedra that share corners with two equivalent Nb(8)N4O2 octahedra and corners with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-39°. In the fourth Nb site, Nb(4) is bonded to one O(11), one O(12), one O(14), one O(17), one O(2), and one O(7) atom to form NbO6 octahedra that share corners with two equivalent Nb(5)N2O4 octahedra, corners with two equivalent Nb(3)NO5 octahedra, and corners with two equivalent Nb(7)NO5 octahedra. The corner-sharing octahedral tilt angles range from 24-39°. In the fifth Nb site, Nb(5) is bonded to one N(3), one N(5), one O(11), one O(13), one O(14), and one O(8) atom to form distorted NbN2O4 octahedra that share corners with two equivalent Nb(2)N2O4 octahedra, corners with two equivalent Nb(6)N2O4 octahedra, and corners with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-41°. In the sixth Nb site, Nb(6) is bonded to one N(3), one N(6), one O(13), one O(15), one O(18), and one O(9) atom to form distorted corner-sharing NbN2O4 octahedra. The corner-sharing octahedral tilt angles range from 20-41°. In the seventh Nb site, Nb(7) is bonded to one N(7), one O(17), one O(19), one O(2), one O(20), and one O(4) atom to form NbNO5 octahedra that share corners with two equivalent Nb(2)N2O4 octahedra, corners with two equivalent Nb(8)N4O2 octahedra, and corners with two equivalent Nb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-40°. In the eighth Nb site, Nb(8) is bonded to one N(2), one N(4), one N(7), one N(8), one O(16), and one O(19) atom to form distorted corner-sharing NbN4O2 octahedra. The corner-sharing octahedral tilt angles range from 28-40°. There are eight inequivalent N sites. In the first N site, N(1) is bonded to one La(3), one La(7), one Nb(1), and one Nb(2) atom to form distorted NLa2Nb2 tetrahedra that share  a cornercorner with one O(17)La2Nb2 tetrahedra,  a cornercorner with one O(1)La3Nb tetrahedra,  a cornercorner with one O(3)La3Nb tetrahedra, corners with two equivalent N(3)La2Nb2 tetrahedra, and  an edgeedge with one O(8)La2Nb2 tetrahedra. In the second N site, N(2) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Nb(3), and one Nb(8) atom. In the third N site, N(3) is bonded to one La(3), one La(7), one Nb(5), and one Nb(6) atom to form distorted NLa2Nb2 tetrahedra that share  a cornercorner with one O(17)La2Nb2 tetrahedra,  a cornercorner with one O(15)La3Nb tetrahedra, corners with two equivalent N(1)La2Nb2 tetrahedra, and  an edgeedge with one O(8)La2Nb2 tetrahedra. In the fourth N site, N(4) is bonded to one La(1), one La(5), one La(8), and one Nb(8) atom to form distorted NLa3Nb tetrahedra that share  a cornercorner with one N(7)La2Nb2 tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra, corners with two equivalent O(3)La3Nb tetrahedra,  an edgeedge with one O(1)La3Nb tetrahedra, and edges with two equivalent N(8)La3Nb tetrahedra. In the fifth N site, N(5) is bonded in a 3-coordinate geometry to one La(7), one Nb(2), and one Nb(5) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one La(7), one La(8), one Nb(1), and one Nb(6) atom. In the seventh N site, N(7) is bonded to one La(2), one La(6), one Nb(7), and one Nb(8) atom to form distorted NLa2Nb2 tetrahedra that share  a cornercorner with one N(4)La3Nb tetrahedra,  a cornercorner with one N(8)La3Nb tetrahedra,  a cornercorner with one O(8)La2Nb2 tetrahedra, corners with two equivalent O(7)La2Nb2 tetrahedra, and  an edgeedge with one O(17)La2Nb2 tetrahedra. In the eighth N site, N(8) is bonded to one La(1), one La(5), one La(8), and one Nb(8) atom to form NLa3Nb tetrahedra that share  a cornercorner with one N(7)La2Nb2 tetrahedra, corners with two equivalent O(1)La3Nb tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra,  an edgeedge with one O(15)La3Nb tetrahedra,  an edgeedge with one O(3)La3Nb tetrahedra, and edges with two equivalent N(4)La3Nb tetrahedra. There are twenty inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(4), one La(8), and one Nb(1) atom to form OLa3Nb tetrahedra that share  a cornercorner with one N(1)La2Nb2 tetrahedra, corners with two equivalent N(8)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra,  an edgeedge with one N(4)La3Nb tetrahedra,  an edgeedge with one O(10)La3Nb tetrahedra, and edges with two equivalent O(3)La3Nb tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(2), one Nb(4), and one Nb(7) atom. In the third O site, O(3) is bonded to one La(1), one La(4), one La(8), and one Nb(1) atom to form distorted OLa3Nb tetrahedra that share  a cornercorner with one N(1)La2Nb2 tetrahedra, corners with two equivalent N(4)La3Nb tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra,  an edgeedge with one N(8)La3Nb tetrahedra, and edges with two equivalent O(1)La3Nb tetrahedra. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(7), one Nb(2), and one Nb(7) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Nb(1), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one La(1), one La(5), and one Nb(3) atom. In the seventh O site, O(7) is bonded to one La(2), one La(6), one Nb(3), and one Nb(4) atom to form distorted OLa2Nb2 tetrahedra that share  a cornercorner with one O(8)La2Nb2 tetrahedra,  a cornercorner with one O(10)La3Nb tetrahedra, corners with two equivalent N(7)La2Nb2 tetrahedra, and  an edgeedge with one O(17)La2Nb2 tetrahedra. In the eighth O site, O(8) is bonded to one La(2), one La(3), one Nb(2), and one Nb(5) atom to form distorted OLa2Nb2 tetrahedra that share  a cornercorner with one N(7)La2Nb2 tetrahedra,  a cornercorner with one O(7)La2Nb2 tetrahedra,  an edgeedge with one N(1)La2Nb2 tetrahedra, and  an edgeedge with one N(3)La2Nb2 tetrahedra. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Nb(1), and one Nb(6) atom. In the tenth O site, O(10) is bonded to one La(1), one La(4), one La(5), and one Nb(3) atom to form distorted OLa3Nb tetrahedra that share  a cornercorner with one O(7)La2Nb2 tetrahedra, corners with two equivalent N(4)La3Nb tetrahedra, corners with two equivalent N(8)La3Nb tetrahedra, corners with two equivalent O(15)La3Nb tetrahedra, corners with two equivalent O(3)La3Nb tetrahedra, and  an edgeedge with one O(1)La3Nb tetrahedra. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one La(2), one La(6), one La(7), one Nb(4), and one Nb(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(5), one La(6), one Nb(3), and one Nb(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Nb(5), and one Nb(6) atom. In the fourteenth O site, O(14) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(7), one Nb(4), and one Nb(5) atom. In the fifteenth O site, O(15) is bonded to one La(4), one La(5), one La(8), and one Nb(6) atom to form distorted OLa3Nb tetrahedra that share  a cornercorner with one N(3)La2Nb2 tetrahedra, corners with two equivalent N(4)La3Nb tetrahedra, corners with two equivalent O(1)La3Nb tetrahedra, corners with two equivalent O(10)La3Nb tetrahedra, corners with two equivalent O(3)La3Nb tetrahedra, and  an edgeedge with one N(8)La3Nb tetrahedra. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one La(5), one La(6), one Nb(3), and one Nb(8) atom. In the seventeenth O site, O(17) is bonded to one La(6), one La(7), one Nb(4), and one Nb(7) atom to form distorted OLa2Nb2 tetrahedra that share  a cornercorner with one N(1)La2Nb2 tetrahedra,  a cornercorner with one N(3)La2Nb2 tetrahedra,  an edgeedge with one N(7)La2Nb2 tetrahedra, and  an edgeedge with one O(7)La2Nb2 tetrahedra. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one La(4), one La(8), and one Nb(6) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one La(5), one La(6), one Nb(7), and one Nb(8) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one La(2), one La(6), one La(7), one Nb(2), and one Nb(7) atom. is represented by the CIF card [CIF]
data_La2Nb2N2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.712
_cell_length_b   8.027
_cell_length_c   13.761
_cell_angle_alpha   98.381
_cell_angle_beta   90.035
_cell_angle_gamma   90.124
_symmetry_Int_Tables_number   1
_cell_volume   624.215
_cell_formula_units_Z   4
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  0.341  0.135  0.571  1.0
  La  La1  1  0.761  0.223  0.908  1.0
  La  La2  1  0.253  0.281  0.123  1.0
  La  La3  1  0.780  0.352  0.389  1.0
  La  La4  1  0.274  0.661  0.608  1.0
  La  La5  1  0.748  0.725  0.879  1.0
  La  La6  1  0.263  0.776  0.096  1.0
  La  La7  1  0.838  0.859  0.432  1.0
  Nb  Nb8  1  0.279  0.063  0.316  1.0
  Nb  Nb9  1  0.752  0.020  0.118  1.0
  Nb  Nb10  1  0.783  0.401  0.675  1.0
  Nb  Nb11  1  0.259  0.473  0.886  1.0
  Nb  Nb12  1  0.751  0.534  0.123  1.0
  Nb  Nb13  1  0.291  0.591  0.321  1.0
  Nb  Nb14  1  0.243  0.971  0.881  1.0
  Nb  Nb15  1  0.788  0.925  0.673  1.0
  N  N16  1  0.451  0.031  0.184  1.0
  N  N17  1  0.689  0.180  0.699  1.0
  N  N18  1  0.445  0.564  0.181  1.0
  N  N19  1  0.559  0.871  0.571  1.0
  N  N20  1  0.820  0.775  0.104  1.0
  N  N21  1  0.194  0.826  0.304  1.0
  N  N22  1  0.949  0.976  0.821  1.0
  N  N23  1  0.051  0.913  0.587  1.0
  O  O24  1  0.546  0.087  0.407  1.0
  O  O25  1  0.324  0.226  0.890  1.0
  O  O26  1  0.055  0.135  0.426  1.0
  O  O27  1  0.050  0.049  0.019  1.0
  O  O28  1  0.965  0.118  0.225  1.0
  O  O29  1  0.077  0.376  0.613  1.0
  O  O30  1  0.946  0.436  0.821  1.0
  O  O31  1  0.678  0.274  0.083  1.0
  O  O32  1  0.343  0.332  0.306  1.0
  O  O33  1  0.585  0.410  0.559  1.0
  O  O34  1  0.531  0.533  0.978  1.0
  O  O35  1  0.452  0.502  0.776  1.0
  O  O36  1  0.956  0.496  0.229  1.0
  O  O37  1  0.043  0.459  0.016  1.0
  O  O38  1  0.074  0.586  0.436  1.0
  O  O39  1  0.847  0.672  0.702  1.0
  O  O40  1  0.176  0.727  0.915  1.0
  O  O41  1  0.576  0.620  0.390  1.0
  O  O42  1  0.451  0.875  0.780  1.0
  O  O43  1  0.549  0.960  0.982  1.0
[/CIF]
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