data_Nb2SnPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.88
_cell_length_b   4.88
_cell_length_c   4.88
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Nb2SnPb
_chemical_formula_sum   'Nb2 Sn1 Pb1'
_cell_volume   82.38
_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  0.73  0.73  0.73  1.0
  Nb  Nb1  1  0.18  0.18  0.18  1.0
  Sn  Sn3  1  0.0  0.0  0.0  1.0
  Pb  Pb2  1  0.45  0.45  0.45  1.0

data_Nb2SnPb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.88
_cell_length_b   4.88
_cell_length_c   11.96
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Nb2SnPb
_chemical_formula_sum   'Nb6 Sn3 Pb3'
_cell_volume   247.13
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.27  1.0
  Nb  Nb1  3  0.0  0.0  0.82  1.0
  Sn  Sn2  3  0.0  0.0  0.0  1.0
  Pb  Pb3  3  0.0  0.0  0.55  1.0

Nb Nb Sn Pb
Nb2PbSn is Heusler structured and crystallizes in the trigonal R3m space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 8-coordinate geometry to four equivalent Pb(1) and four equivalent Sn(1) atoms. There are three shorter (2.91 Å) and one longer (3.27 Å) Nb(1)-Pb(1) bond length. There are three shorter (2.91 Å) and one longer (3.27 Å) Nb(1)-Sn(1) bond length. In the second Nb site, Nb(2) is bonded in a 1-coordinate geometry to four equivalent Pb(1) and one Sn(1) atom. There are three shorter (2.91 Å) and one longer (3.27 Å) Nb(2)-Pb(1) bond length. The Nb(2)-Sn(1) bond length is 2.16 Å. Pb(1) is bonded in a 11-coordinate geometry to four equivalent Nb(1), four equivalent Nb(2), and three equivalent Sn(1) atoms. All Pb(1)-Sn(1) bond lengths are 3.16 Å. Sn(1) is bonded in a distorted single-bond geometry to one Nb(2), four equivalent Nb(1), and three equivalent Pb(1) atoms.