data_Mg2SbPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.45
_cell_length_b   3.45
_cell_length_c   8.56
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2SbPb
_chemical_formula_sum   'Mg2 Sb1 Pb1'
_cell_volume   101.65
_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
  Mg  Mg0  1  0.72  0.72  0.07  1.0
  Mg  Mg1  1  0.72  0.72  0.49  1.0
  Sb  Sb3  1  0.0  0.0  0.0  1.0
  Pb  Pb2  1  0.0  0.0  0.28  1.0

data_Mg2SbPb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.87
_cell_length_b   4.87
_cell_length_c   8.56
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Mg2SbPb
_chemical_formula_sum   'Mg4 Sb2 Pb2'
_cell_volume   203.31
_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
  Mg  Mg0  2  0.22  0.5  0.07  1.0
  Mg  Mg1  2  0.22  0.5  0.49  1.0
  Sb  Sb2  2  0.0  0.0  0.0  1.0
  Pb  Pb3  2  0.0  0.0  0.28  1.0

Mg Mg Sb Pb
Mg2PbSb crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Mg2PbSb clusters. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 1-coordinate geometry to one Pb(1) and one Sb(1) atom. The Mg(1)-Pb(1) bond length is 2.24 Å. The Mg(1)-Sb(1) bond length is 1.48 Å. In the second Mg site, Mg(2) is bonded in a distorted single-bond geometry to one Pb(1) atom. The Mg(2)-Pb(1) bond length is 2.24 Å. Pb(1) is bonded in a 2-coordinate geometry to one Mg(1) and one Mg(2) atom. Sb(1) is bonded in a distorted single-bond geometry to one Mg(1) atom.