data_FeSn2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.28
_cell_length_b   3.28
_cell_length_c   8.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeSn2Pb
_chemical_formula_sum   'Fe1 Sn2 Pb1'
_cell_volume   90.9
_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
  Fe  Fe0  1  0.0  0.0  0.0  1.0
  Sn  Sn2  1  0.64  0.64  0.86  1.0
  Sn  Sn3  1  0.64  0.64  0.58  1.0
  Pb  Pb1  1  0.0  0.0  0.22  1.0

data_FeSn2Pb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.64
_cell_length_b   4.64
_cell_length_c   8.43
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   FeSn2Pb
_chemical_formula_sum   'Fe2 Sn4 Pb2'
_cell_volume   181.8
_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
  Fe  Fe0  2  0.0  0.0  0.0  1.0
  Sn  Sn1  2  0.14  0.5  0.58  1.0
  Sn  Sn2  2  0.14  0.5  0.86  1.0
  Pb  Pb3  2  0.0  0.0  0.22  1.0

Fe Sn Sn Pb
Fe Sn Sn Pb 0 1 - - - 0 3 o o o 1 2 o o o 
FePbSn2 crystallizes in the monoclinic Cm space group. Fe(1) is bonded in a 2-coordinate geometry to one Pb(1) and one Sn(1) atom. The Fe(1)-Pb(1) bond length is 1.83 Å. The Fe(1)-Sn(1) bond length is 2.05 Å. Pb(1) is bonded in a single-bond geometry to one Fe(1) and one Sn(2) atom. The Pb(1)-Sn(2) bond length is 3.45 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 1-coordinate geometry to one Fe(1) and one Sn(2) atom. The Sn(1)-Sn(2) bond length is 2.39 Å. In the second Sn site, Sn(2) is bonded to one Pb(1), one Sn(1), and four equivalent Sn(2) atoms to form a mixture of distorted corner and edge-sharing SnSn5Pb octahedra. The corner-sharing octahedra are not tilted. All Sn(2)-Sn(2) bond lengths are 3.28 Å.