The compound described by Nb2Pb3N4 crystallizes in the orthorhombic Pnna space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted NbN4 trigonal pyramids that share corners with two equivalent Pb(2)N4 trigonal pyramids,  an edgeedge with one Pb(2)N4 trigonal pyramid, and edges with two equivalent Nb(2)N4 trigonal pyramids. In the second Nb site, Nb(2) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted NbN4 trigonal pyramids that share corners with four equivalent Pb(2)N4 trigonal pyramids and edges with two equivalent Nb(1)N4 trigonal pyramids. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted bent 120 degrees geometry to two equivalent N(2) atoms. In the second Pb site, Pb(2) is bonded to four equivalent N(1) atoms to form distorted PbN4 trigonal pyramids that share corners with two equivalent Nb(1)N4 trigonal pyramids, corners with four equivalent Nb(2)N4 trigonal pyramids,  an edgeedge with one Nb(1)N4 trigonal pyramid, and edges with two equivalent Pb(2)N4 trigonal pyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted rectangular see-saw-like geometry to one Nb(1), one Nb(2), and two equivalent Pb(2) atoms. In the second N site, N(2) is bonded to one Nb(1), one Nb(2), and two equivalent Pb(1) atoms to form distorted corner-sharing NNb2Pb2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Nb2Pb3N4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.728
_cell_length_b   11.627
_cell_length_c   9.693
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   758.249
_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
  Nb  Nb0  1  0.750  0.500  0.766  1.0
  Nb  Nb1  1  0.750  0.000  0.734  1.0
  Nb  Nb2  1  0.250  0.500  0.234  1.0
  Nb  Nb3  1  0.250  0.000  0.266  1.0
  Nb  Nb4  1  0.806  0.250  0.750  1.0
  Nb  Nb5  1  0.694  0.750  0.750  1.0
  Nb  Nb6  1  0.194  0.750  0.250  1.0
  Nb  Nb7  1  0.306  0.250  0.250  1.0
  Pb  Pb8  1  0.758  0.143  0.420  1.0
  Pb  Pb9  1  0.742  0.857  0.420  1.0
  Pb  Pb10  1  0.758  0.357  0.080  1.0
  Pb  Pb11  1  0.742  0.643  0.080  1.0
  Pb  Pb12  1  0.242  0.857  0.580  1.0
  Pb  Pb13  1  0.258  0.143  0.580  1.0
  Pb  Pb14  1  0.242  0.643  0.920  1.0
  Pb  Pb15  1  0.258  0.357  0.920  1.0
  Pb  Pb16  1  0.750  0.500  0.432  1.0
  Pb  Pb17  1  0.750  0.000  0.068  1.0
  Pb  Pb18  1  0.250  0.500  0.568  1.0
  Pb  Pb19  1  0.250  0.000  0.932  1.0
  N  N20  1  0.902  0.400  0.641  1.0
  N  N21  1  0.598  0.600  0.641  1.0
  N  N22  1  0.902  0.100  0.859  1.0
  N  N23  1  0.598  0.900  0.859  1.0
  N  N24  1  0.098  0.600  0.359  1.0
  N  N25  1  0.402  0.400  0.359  1.0
  N  N26  1  0.098  0.900  0.141  1.0
  N  N27  1  0.402  0.100  0.141  1.0
  N  N28  1  0.619  0.354  0.838  1.0
  N  N29  1  0.881  0.646  0.838  1.0
  N  N30  1  0.619  0.146  0.662  1.0
  N  N31  1  0.881  0.854  0.662  1.0
  N  N32  1  0.381  0.646  0.162  1.0
  N  N33  1  0.119  0.354  0.162  1.0
  N  N34  1  0.381  0.854  0.338  1.0
  N  N35  1  0.119  0.146  0.338  1.0
[/CIF]
.
The compound described by Nb2Pb3N4 crystallizes in the orthorhombic Pnna space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted NbN4 trigonal pyramids that share corners with two equivalent Pb(2)N4 trigonal pyramids,  an edgeedge with one Pb(2)N4 trigonal pyramid, and edges with two equivalent Nb(2)N4 trigonal pyramids. In the second Nb site, Nb(2) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted NbN4 trigonal pyramids that share corners with four equivalent Pb(2)N4 trigonal pyramids and edges with two equivalent Nb(1)N4 trigonal pyramids. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted bent 120 degrees geometry to two equivalent N(2) atoms. In the second Pb site, Pb(2) is bonded to four equivalent N(1) atoms to form distorted PbN4 trigonal pyramids that share corners with two equivalent Nb(1)N4 trigonal pyramids, corners with four equivalent Nb(2)N4 trigonal pyramids,  an edgeedge with one Nb(1)N4 trigonal pyramid, and edges with two equivalent Pb(2)N4 trigonal pyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted rectangular see-saw-like geometry to one Nb(1), one Nb(2), and two equivalent Pb(2) atoms. In the second N site, N(2) is bonded to one Nb(1), one Nb(2), and two equivalent Pb(1) atoms to form distorted corner-sharing NNb2Pb2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Nb2Pb3N4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.728
_cell_length_b   11.627
_cell_length_c   9.693
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   758.249
_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
  Nb  Nb0  1  0.750  0.500  0.766  1.0
  Nb  Nb1  1  0.750  0.000  0.734  1.0
  Nb  Nb2  1  0.250  0.500  0.234  1.0
  Nb  Nb3  1  0.250  0.000  0.266  1.0
  Nb  Nb4  1  0.806  0.250  0.750  1.0
  Nb  Nb5  1  0.694  0.750  0.750  1.0
  Nb  Nb6  1  0.194  0.750  0.250  1.0
  Nb  Nb7  1  0.306  0.250  0.250  1.0
  Pb  Pb8  1  0.758  0.143  0.420  1.0
  Pb  Pb9  1  0.742  0.857  0.420  1.0
  Pb  Pb10  1  0.758  0.357  0.080  1.0
  Pb  Pb11  1  0.742  0.643  0.080  1.0
  Pb  Pb12  1  0.242  0.857  0.580  1.0
  Pb  Pb13  1  0.258  0.143  0.580  1.0
  Pb  Pb14  1  0.242  0.643  0.920  1.0
  Pb  Pb15  1  0.258  0.357  0.920  1.0
  Pb  Pb16  1  0.750  0.500  0.432  1.0
  Pb  Pb17  1  0.750  0.000  0.068  1.0
  Pb  Pb18  1  0.250  0.500  0.568  1.0
  Pb  Pb19  1  0.250  0.000  0.932  1.0
  N  N20  1  0.902  0.400  0.641  1.0
  N  N21  1  0.598  0.600  0.641  1.0
  N  N22  1  0.902  0.100  0.859  1.0
  N  N23  1  0.598  0.900  0.859  1.0
  N  N24  1  0.098  0.600  0.359  1.0
  N  N25  1  0.402  0.400  0.359  1.0
  N  N26  1  0.098  0.900  0.141  1.0
  N  N27  1  0.402  0.100  0.141  1.0
  N  N28  1  0.619  0.354  0.838  1.0
  N  N29  1  0.881  0.646  0.838  1.0
  N  N30  1  0.619  0.146  0.662  1.0
  N  N31  1  0.881  0.854  0.662  1.0
  N  N32  1  0.381  0.646  0.162  1.0
  N  N33  1  0.119  0.354  0.162  1.0
  N  N34  1  0.381  0.854  0.338  1.0
  N  N35  1  0.119  0.146  0.338  1.0
[/CIF]
.