data_NbPb2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.14
_cell_length_b   5.14
_cell_length_c   3.13
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NbPb2
_chemical_formula_sum   'Nb1 Pb2'
_cell_volume   82.74
_cell_formula_units_Z   1
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  0.0  0.0  0.0  1.0
  Pb  Pb1  1  0.0  0.57  0.57  1.0
  Pb  Pb2  1  0.57  0.0  0.57  1.0

data_NbPb2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.27
_cell_length_b   7.27
_cell_length_c   3.13
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NbPb2
_chemical_formula_sum   'Nb2 Pb4'
_cell_volume   165.48
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.0  1.0
  Pb  Pb1  4  0.29  0.29  0.57  1.0

Nb Pb Pb
NbPb2 crystallizes in the monoclinic Cm space group. Nb(1) is bonded in a 8-coordinate geometry to eight equivalent Pb(1) atoms. There are a spread of Nb(1)-Pb(1) bond distances ranging from 2.59-3.43 Å. Pb(1) is bonded in a 4-coordinate geometry to four equivalent Nb(1) atoms.