data_Bi2AsOs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.31
_cell_length_b   3.4
_cell_length_c   7.97
_cell_angle_alpha   90.0
_cell_angle_beta   96.75
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Bi2AsOs
_chemical_formula_sum   'Bi2 As1 Os1'
_cell_volume   89.14
_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
  Bi  Bi1  1  0.27  0.7  0.24  1.0
  Bi  Bi2  1  0.11  0.7  0.67  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  Os  Os3  1  0.53  0.0  0.96  1.0

data_Bi2AsOs
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.31
_cell_length_b   3.4
_cell_length_c   7.97
_cell_angle_alpha   90.0
_cell_angle_beta   96.75
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Bi2AsOs
_chemical_formula_sum   'Bi2 As1 Os1'
_cell_volume   89.14
_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
  Bi  Bi0  1  0.11  0.7  0.67  1.0
  Bi  Bi1  1  0.27  0.7  0.24  1.0
  As  As2  1  0.0  0.0  0.0  1.0
  Os  Os3  1  0.53  0.0  0.96  1.0

Bi Bi As Os
OsBi2As crystallizes in the triclinic P1 space group. Os(1) is bonded in a 2-coordinate geometry to three equivalent Bi(2) and two equivalent As(1) atoms. There are a spread of Os(1)-Bi(2) bond distances ranging from 2.72-3.48 Å. There is one shorter (1.55 Å) and one longer (1.83 Å) Os(1)-As(1) bond length. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a distorted single-bond geometry to one Bi(2) and one As(1) atom. The Bi(1)-Bi(2) bond length is 3.52 Å. The Bi(1)-As(1) bond length is 2.27 Å. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to three equivalent Os(1), one Bi(1), four equivalent Bi(2), and one As(1) atom. There are two shorter (3.31 Å) and two longer (3.40 Å) Bi(2)-Bi(2) bond lengths. The Bi(2)-As(1) bond length is 2.87 Å. As(1) is bonded in a 3-coordinate geometry to two equivalent Os(1), one Bi(1), and one Bi(2) atom.