data_Be2GePb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.78
_cell_length_b   4.78
_cell_length_c   4.78
_cell_angle_alpha   126.02
_cell_angle_beta   126.02
_cell_angle_gamma   79.86
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Be2GePb
_chemical_formula_sum   'Be2 Ge1 Pb1'
_cell_volume   69.03
_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
  Be  Be0  1  0.0  0.17  0.83  1.0
  Be  Be1  1  0.17  0.0  0.83  1.0
  Ge  Ge2  1  0.0  0.0  0.0  1.0
  Pb  Pb3  1  0.0  0.0  0.67  1.0

data_Be2GePb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.14
_cell_length_b   6.14
_cell_length_c   4.78
_cell_angle_alpha   90.0
_cell_angle_beta   129.93
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Be2GePb
_chemical_formula_sum   'Be4 Ge2 Pb2'
_cell_volume   138.06
_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
  Be  Be0  4  0.42  0.42  0.66  1.0
  Ge  Ge1  2  0.0  0.0  0.0  1.0
  Pb  Pb2  2  0.0  0.0  0.67  1.0

Be Be Ge Pb
Be Be Ge Pb 0 3 o o o 0 2 o o + 1 3 o o o 1 2 o o + 2 3 o o - 
Be2PbGe is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Be2PbGe clusters. Be(1) is bonded in a distorted single-bond geometry to one Pb(1) and one Ge(1) atom. The Be(1)-Pb(1) bond length is 0.73 Å. The Be(1)-Ge(1) bond length is 1.43 Å. Pb(1) is bonded in an L-shaped geometry to two equivalent Be(1) atoms. Ge(1) is bonded in a 2-coordinate geometry to two equivalent Be(1) atoms.