data_SrSnBi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.12
_cell_length_b   5.12
_cell_length_c   4.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSnBi2
_chemical_formula_sum   'Sr1 Sn1 Bi2'
_cell_volume   125.24
_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  0.0  0.0  0.0  1.0
  Sn  Sn2  1  0.56  0.56  0.0  1.0
  Bi  Bi0  1  0.0  0.56  0.39  1.0
  Bi  Bi1  1  0.56  0.0  0.39  1.0

data_SrSnBi2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.24
_cell_length_b   7.24
_cell_length_c   4.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrSnBi2
_chemical_formula_sum   'Sr2 Sn2 Bi4'
_cell_volume   250.48
_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  0.0  0.0  0.0  1.0
  Sn  Sn1  2  0.06  0.5  0.0  1.0
  Bi  Bi2  4  0.28  0.28  0.39  1.0

Sr Sn Bi Bi
SrSnBi2 crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a 12-coordinate geometry to four equivalent Sn(1) and eight equivalent Bi(1) atoms. There are a spread of Sr(1)-Sn(1) bond distances ranging from 3.19-4.05 Å. There are a spread of Sr(1)-Bi(1) bond distances ranging from 2.93-4.09 Å. Sn(1) is bonded in a 7-coordinate geometry to four equivalent Sr(1) and four equivalent Bi(1) atoms. There are two shorter (2.93 Å) and two longer (3.42 Å) Sn(1)-Bi(1) bond lengths. Bi(1) is bonded in a 1-coordinate geometry to four equivalent Sr(1) and two equivalent Sn(1) atoms.