data_SiOs4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.36
_cell_length_b   7.36
_cell_length_c   7.36
_cell_angle_alpha   109.47
_cell_angle_beta   109.47
_cell_angle_gamma   109.47
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiOs4
_chemical_formula_sum   'Si4 Os16'
_cell_volume   306.8
_cell_formula_units_Z   4
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  Si16  1  0.97  0.97  0.97  1.0
  Si  Si17  1  0.72  0.28  0.28  1.0
  Si  Si18  1  0.28  0.72  0.28  1.0
  Si  Si19  1  0.28  0.28  0.72  1.0
  Os  Os0  1  0.35  0.35  0.35  1.0
  Os  Os1  1  0.1  0.9  0.9  1.0
  Os  Os2  1  0.9  0.1  0.9  1.0
  Os  Os3  1  0.9  0.9  0.1  1.0
  Os  Os4  1  0.0  0.0  0.68  1.0
  Os  Os5  1  0.0  0.0  0.82  1.0
  Os  Os6  1  0.0  0.68  0.0  1.0
  Os  Os7  1  0.0  0.82  0.0  1.0
  Os  Os8  1  0.68  0.0  0.0  1.0
  Os  Os9  1  0.82  0.0  0.0  1.0
  Os  Os10  1  0.25  0.0  0.12  1.0
  Os  Os11  1  0.0  0.25  0.12  1.0
  Os  Os12  1  0.0  0.12  0.25  1.0
  Os  Os13  1  0.25  0.12  0.0  1.0
  Os  Os14  1  0.12  0.25  0.0  1.0
  Os  Os15  1  0.12  0.0  0.25  1.0

data_SiOs4
_symmetry_space_group_name_H-M   R3m
_cell_length_a   12.02
_cell_length_b   12.02
_cell_length_c   7.36
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SiOs4
_chemical_formula_sum   'Si12 Os48'
_cell_volume   920.4
_cell_formula_units_Z   12
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+2/3, y+1/3, z+1/3'
  8  '-y+2/3, x-y+1/3, z+1/3'
  9  '-x+y+2/3, -x+1/3, z+1/3'
  10  '-y+2/3, -x+1/3, z+1/3'
  11  '-x+y+2/3, y+1/3, z+1/3'
  12  'x+2/3, x-y+1/3, z+1/3'
  13  'x+1/3, y+2/3, z+2/3'
  14  '-y+1/3, x-y+2/3, z+2/3'
  15  '-x+y+1/3, -x+2/3, z+2/3'
  16  '-y+1/3, -x+2/3, z+2/3'
  17  '-x+y+1/3, y+2/3, z+2/3'
  18  'x+1/3, x-y+2/3, z+2/3'
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  9  0.19  0.37  0.09  1.0
  Si  Si1  3  0.0  0.0  0.97  1.0
  Os  Os2  18  0.0  0.12  0.12  1.0
  Os  Os3  9  0.06  0.12  0.94  1.0
  Os  Os4  9  0.11  0.22  0.89  1.0
  Os  Os5  9  0.14  0.07  0.97  1.0
  Os  Os6  3  0.0  0.0  0.35  1.0

Si Si Si Si Os Os Os Os Os Os Os Os Os Os Os Os Os Os Os Os
Si Si Si Si Os Os Os Os Os Os Os Os Os Os Os Os Os Os Os Os 0 7 o o + 0 6 o + o 0 13 o + + 0 5 + o o 0 11 + o + 0 9 + + o 1 16 + o o 1 15 + o o 1 13 o o o 1 12 o o o 2 10 o o o 2 19 o + o 2 14 o + o 2 11 o o o 3 18 o o + 3 9 o o o 3 8 o o o 3 17 o o + 4 18 o o o 4 15 o o o 4 19 o o o 4 16 o o o 4 14 o o o 4 17 o o o 5 11 o o + 5 9 o + o 5 17 o + + 5 14 o + + 6 13 o o + 6 9 + o o 6 18 + o + 6 15 + o + 7 13 o + o 7 16 + + o 7 11 + o o 7 19 + + o 8 9 o o o 9 17 o o + 9 18 o o + 10 11 o o o 11 14 o + o 11 19 o + o 12 13 o o o 13 15 + o o 13 16 + o o 14 17 o o o 14 19 o o o 15 16 o o o 15 18 o o o 16 19 o o o 17 18 o o o 
Os4Si crystallizes in the trigonal R3m space group. There are six inequivalent Os sites. In the first Os site, Os(1) is bonded in a 9-coordinate geometry to six Os(5,5) and three equivalent Si(2) atoms. All Os(1)-Os(5,5) bond lengths are 2.25 Å. All Os(1)-Si(2) bond lengths are 3.13 Å. In the second Os site, Os(2) is bonded in a 5-coordinate geometry to two equivalent Os(4); two Os(5,5); and one Si(1) atom. Both Os(2)-Os(4) bond lengths are 1.37 Å. Both Os(2)-Os(5,5) bond lengths are 1.40 Å. The Os(2)-Si(1) bond length is 1.45 Å. In the third Os site, Os(3) is bonded in a bent 120 degrees geometry to one Os(4) and one Si(2) atom. The Os(3)-Os(4) bond length is 1.08 Å. The Os(3)-Si(2) bond length is 2.18 Å. In the fourth Os site, Os(4) is bonded in a 6-coordinate geometry to one Os(3), two equivalent Os(2), two equivalent Os(5), and one Si(1) atom. Both Os(4)-Os(5) bond lengths are 1.55 Å. The Os(4)-Si(1) bond length is 1.26 Å. In the fifth Os site, Os(5) is bonded in a 4-coordinate geometry to one Os(1); one Os(2); one Os(4); and two Os(5,5) atoms. Both Os(5)-Os(5,5) bond lengths are 1.49 Å. In the sixth Os site, Os(5) is bonded in a 4-coordinate geometry to one Os(1); one Os(2); one Os(4); and two Os(5,5) atoms. The Os(5)-Os(4) bond length is 1.55 Å. The Os(5)-Os(5) bond length is 1.49 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted hexagonal planar geometry to three equivalent Os(2) and three equivalent Os(4) atoms. In the second Si site, Si(2) is bonded in a distorted single-bond geometry to one Os(1) and one Os(3) atom.