data_SrAlPb2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.95
_cell_length_b   4.95
_cell_length_c   4.77
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAlPb2
_chemical_formula_sum   'Sr1 Al1 Pb2'
_cell_volume   116.83
_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
  Sr  Sr3  1  0.48  0.48  0.0  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Pb  Pb1  1  0.0  0.48  0.38  1.0
  Pb  Pb2  1  0.48  0.0  0.38  1.0

data_SrAlPb2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.0
_cell_length_b   7.0
_cell_length_c   4.77
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrAlPb2
_chemical_formula_sum   'Sr2 Al2 Pb4'
_cell_volume   233.67
_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
  Sr  Sr0  2  0.48  0.0  0.0  1.0
  Al  Al1  2  0.0  0.0  0.0  1.0
  Pb  Pb2  4  0.24  0.24  0.38  1.0

Sr Al Pb Pb
Sr Al Pb Pb 0 1 o o o 0 1 o + o 0 1 + o o 0 1 + + o 0 2 o o - 0 2 o o o 0 2 + o o 0 3 o o - 0 3 o o o 0 3 o + o 1 3 - o o 1 3 o o - 1 3 o o o 1 2 o - o 1 2 o o - 1 2 o o o 2 3 - o o 2 3 - + o 2 3 o o o 2 3 o + o 
SrAlPb2 crystallizes in the monoclinic Cm space group. Sr(1) is bonded to four equivalent Al(1) and eight equivalent Pb(1) atoms to form a mixture of distorted face and corner-sharing SrAl4Pb8 cuboctahedra. There are a spread of Sr(1)-Al(1) bond distances ranging from 3.33-3.67 Å. There are a spread of Sr(1)-Pb(1) bond distances ranging from 2.98-3.92 Å. Al(1) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Pb(1) atoms. There are two shorter (2.98 Å) and two longer (3.18 Å) Al(1)-Pb(1) bond lengths. Pb(1) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Al(1) atoms.