data_SiAs2Os
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.46
_cell_length_b   4.46
_cell_length_c   4.46
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiAs2Os
_chemical_formula_sum   'Si1 As2 Os1'
_cell_volume   62.78
_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
  Si  Si3  1  0.0  0.0  0.0  1.0
  As  As0  1  0.58  0.58  0.58  1.0
  As  As1  1  0.73  0.73  0.73  1.0
  Os  Os2  1  0.15  0.15  0.15  1.0

data_SiAs2Os
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.46
_cell_length_b   4.46
_cell_length_c   10.93
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SiAs2Os
_chemical_formula_sum   'Si3 As6 Os3'
_cell_volume   188.34
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Si  Si0  3  0.0  0.0  0.0  1.0
  As  As1  3  0.0  0.0  0.27  1.0
  As  As2  3  0.0  0.0  0.42  1.0
  Os  Os3  3  0.0  0.0  0.85  1.0

Si As As Os
OsSiAs2 crystallizes in the trigonal R3m space group. Os(1) is bonded in a single-bond geometry to one Si(1) and three equivalent As(1) atoms. The Os(1)-Si(1) bond length is 1.69 Å. All Os(1)-As(1) bond lengths are 2.75 Å. Si(1) is bonded in a single-bond geometry to one Os(1) and three equivalent As(1) atoms. All Si(1)-As(1) bond lengths are 2.75 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to three equivalent Os(1), three equivalent Si(1), and one As(2) atom. The As(1)-As(2) bond length is 1.69 Å. In the second As site, As(2) is bonded in a 1-coordinate geometry to one As(1) atom.