data_SnBi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.13
_cell_length_b   6.13
_cell_length_c   6.13
_cell_angle_alpha   99.39
_cell_angle_beta   99.39
_cell_angle_gamma   132.34
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnBi4
_chemical_formula_sum   'Sn1 Bi4'
_cell_volume   155.64
_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
  Sn  Sn4  1  0.0  0.0  0.0  1.0
  Bi  Bi0  1  0.16  0.59  0.0  1.0
  Bi  Bi1  1  0.59  0.76  0.0  1.0
  Bi  Bi2  1  0.8  0.38  0.48  1.0
  Bi  Bi3  1  0.38  0.2  0.48  1.0

data_SnBi4
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.95
_cell_length_b   6.13
_cell_length_c   6.13
_cell_angle_alpha   80.61
_cell_angle_beta   66.17
_cell_angle_gamma   66.17
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnBi4
_chemical_formula_sum   'Sn1 Bi4'
_cell_volume   155.64
_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
  Sn  Sn0  1  0.0  0.0  0.0  1.0
  Bi  Bi1  1  0.59  0.0  0.58  1.0
  Bi  Bi2  1  0.72  0.48  0.18  1.0
  Bi  Bi3  1  0.76  0.0  0.82  1.0
  Bi  Bi4  1  0.9  0.48  0.42  1.0

Sn Bi Bi Bi Bi
Sn Bi Bi Bi Bi 0 2 - - o 1 2 o o o 3 4 o o o 
SnBi4 crystallizes in the triclinic P1 space group. Sn(1) is bonded in a 1-coordinate geometry to one Bi(2), one Bi(4), and two equivalent Bi(1) atoms. The Sn(1)-Bi(2) bond length is 1.88 Å. The Sn(1)-Bi(4) bond length is 2.86 Å. There is one shorter (3.02 Å) and one longer (3.29 Å) Sn(1)-Bi(1) bond length. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to two equivalent Sn(1), one Bi(2), and one Bi(3) atom. The Bi(1)-Bi(2) bond length is 2.03 Å. The Bi(1)-Bi(3) bond length is 3.06 Å. In the second Bi site, Bi(2) is bonded in a distorted linear geometry to one Sn(1) and one Bi(1) atom. In the third Bi site, Bi(3) is bonded in a 1-coordinate geometry to one Bi(1) and one Bi(4) atom. The Bi(3)-Bi(4) bond length is 2.03 Å. In the fourth Bi site, Bi(4) is bonded in a water-like geometry to one Sn(1) and one Bi(3) atom.