data_Ta2BiOs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.1
_cell_length_b   3.1
_cell_length_c   8.07
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2BiOs
_chemical_formula_sum   'Ta2 Bi1 Os1'
_cell_volume   77.32
_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
  Ta  Ta2  1  0.55  0.55  0.68  1.0
  Ta  Ta3  1  0.55  0.55  0.38  1.0
  Bi  Bi0  1  0.0  0.0  0.03  1.0
  Os  Os1  1  0.0  0.0  0.0  1.0

data_Ta2BiOs
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.38
_cell_length_b   4.38
_cell_length_c   8.07
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ta2BiOs
_chemical_formula_sum   'Ta4 Bi2 Os2'
_cell_volume   154.63
_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
  Ta  Ta0  2  0.05  0.5  0.38  1.0
  Ta  Ta1  2  0.05  0.5  0.68  1.0
  Bi  Bi2  2  0.0  0.0  0.03  1.0
  Os  Os3  2  0.0  0.0  0.0  1.0

Ta Ta Bi Os
Ta2OsBi crystallizes in the monoclinic Cm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 9-coordinate geometry to one Ta(2), four equivalent Ta(1), and four equivalent Os(1) atoms. The Ta(1)-Ta(2) bond length is 2.42 Å. All Ta(1)-Ta(1) bond lengths are 3.10 Å. There are a spread of Ta(1)-Os(1) bond distances ranging from 3.23-3.50 Å. In the second Ta site, Ta(2) is bonded in a 9-coordinate geometry to one Ta(1), four equivalent Ta(2), and four equivalent Bi(1) atoms. All Ta(2)-Ta(2) bond lengths are 3.10 Å. There are a spread of Ta(2)-Bi(1) bond distances ranging from 3.45-3.71 Å. Os(1) is bonded in a single-bond geometry to four equivalent Ta(1) and one Bi(1) atom. The Os(1)-Bi(1) bond length is 0.27 Å. Bi(1) is bonded in a single-bond geometry to four equivalent Ta(2) and one Os(1) atom.