The material structure described by Nb2Pb2Se4O15 crystallizes in the monoclinic C2/c space group. Nb(1) is bonded to one O(3), one O(4), one O(6), one O(8), and two equivalent O(7) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 2-31°. Pb(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Pb(1) and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Pb(1) and one Se(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Nb(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Nb(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to two equivalent Pb(1) and one Se(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Nb(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Nb(1) atoms. In the eighth O site, O(8) is bonded in a linear geometry to two equivalent Nb(1) atoms. is represented by the CIF card [CIF]
data_Nb2Pb2Se4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.988
_cell_length_b   13.988
_cell_length_c   7.879
_cell_angle_alpha   85.728
_cell_angle_beta   85.728
_cell_angle_gamma   29.775
_symmetry_Int_Tables_number   1
_cell_volume   763.337
_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  0.922  0.936  0.737  1.0
  Nb  Nb1  1  0.064  0.078  0.763  1.0
  Nb  Nb2  1  0.078  0.064  0.263  1.0
  Nb  Nb3  1  0.936  0.922  0.237  1.0
  Pb  Pb4  1  0.813  0.594  0.684  1.0
  Pb  Pb5  1  0.406  0.187  0.816  1.0
  Pb  Pb6  1  0.187  0.406  0.316  1.0
  Pb  Pb7  1  0.594  0.813  0.184  1.0
  Se  Se8  1  0.919  0.703  0.937  1.0
  Se  Se9  1  0.297  0.081  0.563  1.0
  Se  Se10  1  0.081  0.297  0.063  1.0
  Se  Se11  1  0.703  0.919  0.437  1.0
  Se  Se12  1  0.343  0.499  0.514  1.0
  Se  Se13  1  0.501  0.657  0.986  1.0
  Se  Se14  1  0.657  0.501  0.486  1.0
  Se  Se15  1  0.499  0.343  0.014  1.0
  O  O16  1  0.048  0.518  0.813  1.0
  O  O17  1  0.482  0.952  0.687  1.0
  O  O18  1  0.952  0.482  0.187  1.0
  O  O19  1  0.518  0.048  0.313  1.0
  O  O20  1  0.702  0.830  0.950  1.0
  O  O21  1  0.170  0.298  0.550  1.0
  O  O22  1  0.298  0.170  0.050  1.0
  O  O23  1  0.830  0.702  0.450  1.0
  O  O24  1  0.845  0.858  0.787  1.0
  O  O25  1  0.142  0.155  0.713  1.0
  O  O26  1  0.155  0.142  0.213  1.0
  O  O27  1  0.858  0.845  0.287  1.0
  O  O28  1  0.200  0.649  0.336  1.0
  O  O29  1  0.351  0.800  0.164  1.0
  O  O30  1  0.800  0.351  0.664  1.0
  O  O31  1  0.649  0.200  0.836  1.0
  O  O32  1  0.340  0.380  0.531  1.0
  O  O33  1  0.620  0.660  0.969  1.0
  O  O34  1  0.660  0.620  0.469  1.0
  O  O35  1  0.380  0.340  0.031  1.0
  O  O36  1  0.196  0.655  0.689  1.0
  O  O37  1  0.345  0.804  0.811  1.0
  O  O38  1  0.804  0.345  0.311  1.0
  O  O39  1  0.655  0.196  0.189  1.0
  O  O40  1  0.851  0.999  0.516  1.0
  O  O41  1  0.001  0.149  0.984  1.0
  O  O42  1  0.149  0.001  0.484  1.0
  O  O43  1  0.999  0.851  0.016  1.0
  O  O44  1  0.996  0.004  0.750  1.0
  O  O45  1  0.004  0.996  0.250  1.0
[/CIF]
.
The material structure described by Nb2Pb2Se4O15 crystallizes in the monoclinic C2/c space group. Nb(1) is bonded to one O(3), one O(4), one O(6), one O(8), and two equivalent O(7) atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 2-31°. Pb(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Pb(1) and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Pb(1) and one Se(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Nb(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Nb(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to two equivalent Pb(1) and one Se(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Nb(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Nb(1) atoms. In the eighth O site, O(8) is bonded in a linear geometry to two equivalent Nb(1) atoms. is represented by the CIF card [CIF]
data_Nb2Pb2Se4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.988
_cell_length_b   13.988
_cell_length_c   7.879
_cell_angle_alpha   85.728
_cell_angle_beta   85.728
_cell_angle_gamma   29.775
_symmetry_Int_Tables_number   1
_cell_volume   763.337
_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  0.922  0.936  0.737  1.0
  Nb  Nb1  1  0.064  0.078  0.763  1.0
  Nb  Nb2  1  0.078  0.064  0.263  1.0
  Nb  Nb3  1  0.936  0.922  0.237  1.0
  Pb  Pb4  1  0.813  0.594  0.684  1.0
  Pb  Pb5  1  0.406  0.187  0.816  1.0
  Pb  Pb6  1  0.187  0.406  0.316  1.0
  Pb  Pb7  1  0.594  0.813  0.184  1.0
  Se  Se8  1  0.919  0.703  0.937  1.0
  Se  Se9  1  0.297  0.081  0.563  1.0
  Se  Se10  1  0.081  0.297  0.063  1.0
  Se  Se11  1  0.703  0.919  0.437  1.0
  Se  Se12  1  0.343  0.499  0.514  1.0
  Se  Se13  1  0.501  0.657  0.986  1.0
  Se  Se14  1  0.657  0.501  0.486  1.0
  Se  Se15  1  0.499  0.343  0.014  1.0
  O  O16  1  0.048  0.518  0.813  1.0
  O  O17  1  0.482  0.952  0.687  1.0
  O  O18  1  0.952  0.482  0.187  1.0
  O  O19  1  0.518  0.048  0.313  1.0
  O  O20  1  0.702  0.830  0.950  1.0
  O  O21  1  0.170  0.298  0.550  1.0
  O  O22  1  0.298  0.170  0.050  1.0
  O  O23  1  0.830  0.702  0.450  1.0
  O  O24  1  0.845  0.858  0.787  1.0
  O  O25  1  0.142  0.155  0.713  1.0
  O  O26  1  0.155  0.142  0.213  1.0
  O  O27  1  0.858  0.845  0.287  1.0
  O  O28  1  0.200  0.649  0.336  1.0
  O  O29  1  0.351  0.800  0.164  1.0
  O  O30  1  0.800  0.351  0.664  1.0
  O  O31  1  0.649  0.200  0.836  1.0
  O  O32  1  0.340  0.380  0.531  1.0
  O  O33  1  0.620  0.660  0.969  1.0
  O  O34  1  0.660  0.620  0.469  1.0
  O  O35  1  0.380  0.340  0.031  1.0
  O  O36  1  0.196  0.655  0.689  1.0
  O  O37  1  0.345  0.804  0.811  1.0
  O  O38  1  0.804  0.345  0.311  1.0
  O  O39  1  0.655  0.196  0.189  1.0
  O  O40  1  0.851  0.999  0.516  1.0
  O  O41  1  0.001  0.149  0.984  1.0
  O  O42  1  0.149  0.001  0.484  1.0
  O  O43  1  0.999  0.851  0.016  1.0
  O  O44  1  0.996  0.004  0.750  1.0
  O  O45  1  0.004  0.996  0.250  1.0
[/CIF]
.