data_Sn2GePb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.75
_cell_length_b   4.75
_cell_length_c   4.76
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sn2GePb
_chemical_formula_sum   'Sn2 Ge1 Pb1'
_cell_volume   107.55
_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
  Sn  Sn2  1  0.38  0.0  0.38  1.0
  Sn  Sn3  1  0.0  0.38  0.38  1.0
  Ge  Ge0  1  0.0  0.0  0.0  1.0
  Pb  Pb1  1  0.38  0.38  0.0  1.0

data_Sn2GePb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.72
_cell_length_b   6.72
_cell_length_c   4.76
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sn2GePb
_chemical_formula_sum   'Sn4 Ge2 Pb2'
_cell_volume   215.1
_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
  Sn  Sn0  4  0.19  0.19  0.38  1.0
  Ge  Ge1  2  0.0  0.0  0.0  1.0
  Pb  Pb2  2  0.38  0.0  0.0  1.0

Sn Sn Ge Pb
Sn Sn Ge Pb 0 2 o o o 0 1 o o o 0 3 o o o 1 2 o o o 1 3 o o o 2 3 o o o 
PbSn2Ge crystallizes in the monoclinic Cm space group. Pb(1) is bonded in a 3-coordinate geometry to six equivalent Sn(1) and one Ge(1) atom. There are a spread of Pb(1)-Sn(1) bond distances ranging from 2.55-3.47 Å. The Pb(1)-Ge(1) bond length is 2.53 Å. Sn(1) is bonded in a 5-coordinate geometry to three equivalent Pb(1), one Sn(1), and one Ge(1) atom. The Sn(1)-Sn(1) bond length is 2.53 Å. The Sn(1)-Ge(1) bond length is 2.55 Å. Ge(1) is bonded in a 3-coordinate geometry to one Pb(1) and two equivalent Sn(1) atoms.