data_GePb2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.21
_cell_length_b   7.21
_cell_length_c   7.12
_cell_angle_alpha   104.53
_cell_angle_beta   104.53
_cell_angle_gamma   28.42
_symmetry_Int_Tables_number   1
_chemical_formula_structural   GePb2
_chemical_formula_sum   'Ge2 Pb4'
_cell_volume   170.14
_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
  Ge  Ge0  1  0.49  0.0  0.38  1.0
  Ge  Ge1  1  0.64  0.0  0.5  1.0
  Pb  Pb2  1  0.84  0.0  0.88  1.0
  Pb  Pb3  1  0.03  0.0  0.21  1.0
  Pb  Pb4  1  0.1  0.0  0.68  1.0
  Pb  Pb5  1  0.29  0.0  0.0  1.0

data_GePb2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.54
_cell_length_b   7.12
_cell_length_c   7.21
_cell_angle_alpha   104.53
_cell_angle_beta   104.21
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   GePb2
_chemical_formula_sum   'Ge2 Pb4'
_cell_volume   170.14
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Ge  Ge0  2  0.0  0.06  0.58  1.0
  Pb  Pb1  2  0.0  0.23  0.04  1.0
  Pb  Pb2  2  0.0  0.44  0.78  1.0

Ge Ge Pb Pb Pb Pb
Pb2Ge is Brookite-like structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 3-coordinate geometry to two equivalent Pb(2) and one Ge(1) atom. There is one shorter (2.37 Å) and one longer (2.64 Å) Pb(1)-Pb(2) bond length. The Pb(1)-Ge(1) bond length is 2.74 Å. In the second Pb site, Pb(2) is bonded in a 6-coordinate geometry to two equivalent Pb(1), three equivalent Pb(2), and one Ge(1) atom. There is one shorter (3.25 Å) and two longer (3.54 Å) Pb(2)-Pb(2) bond lengths. The Pb(2)-Ge(1) bond length is 3.22 Å. Ge(1) is bonded in a 3-coordinate geometry to one Pb(1), one Pb(2), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 1.22 Å.