The structure described by Os2Si3 crystallizes in the orthorhombic Pbcn space group. There are three inequivalent Os sites. In the first Os site, Os(3) is bonded in a 7-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and three equivalent Si(2) atoms. In the second Os site, Os(1) is bonded to two equivalent Si(3) and four equivalent Si(1) atoms to form distorted edge-sharing OsSi6 octahedra. In the third Os site, Os(2) is bonded in a 8-coordinate geometry to four equivalent Si(2) and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to two equivalent Os(1) and two equivalent Os(3) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to two equivalent Os(2) and three equivalent Os(3) atoms. In the third Si site, Si(3) is bonded in a 5-coordinate geometry to one Os(1), two equivalent Os(2), and two equivalent Os(3) atoms. is represented by the CIF file [CIF]
data_Si3Os2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.598
_cell_length_b   8.966
_cell_length_c   11.195
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   561.863
_cell_formula_units_Z   8
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  Si0  1  0.603  0.105  0.631  1.0
  Si  Si1  1  0.103  0.395  0.869  1.0
  Si  Si2  1  0.897  0.105  0.369  1.0
  Si  Si3  1  0.397  0.395  0.131  1.0
  Si  Si4  1  0.397  0.895  0.369  1.0
  Si  Si5  1  0.897  0.605  0.131  1.0
  Si  Si6  1  0.103  0.895  0.631  1.0
  Si  Si7  1  0.603  0.605  0.869  1.0
  Si  Si8  1  0.911  0.063  0.819  1.0
  Si  Si9  1  0.411  0.437  0.681  1.0
  Si  Si10  1  0.589  0.063  0.181  1.0
  Si  Si11  1  0.089  0.437  0.319  1.0
  Si  Si12  1  0.089  0.937  0.181  1.0
  Si  Si13  1  0.589  0.563  0.319  1.0
  Si  Si14  1  0.411  0.937  0.819  1.0
  Si  Si15  1  0.911  0.563  0.681  1.0
  Si  Si16  1  0.558  0.704  0.575  1.0
  Si  Si17  1  0.058  0.796  0.925  1.0
  Si  Si18  1  0.942  0.704  0.425  1.0
  Si  Si19  1  0.442  0.796  0.075  1.0
  Si  Si20  1  0.442  0.296  0.425  1.0
  Si  Si21  1  0.942  0.204  0.075  1.0
  Si  Si22  1  0.058  0.296  0.575  1.0
  Si  Si23  1  0.558  0.204  0.925  1.0
  Os  Os24  1  0.750  0.923  0.500  1.0
  Os  Os25  1  0.250  0.577  0.000  1.0
  Os  Os26  1  0.250  0.077  0.500  1.0
  Os  Os27  1  0.750  0.423  0.000  1.0
  Os  Os28  1  0.750  0.463  0.500  1.0
  Os  Os29  1  0.250  0.037  0.000  1.0
  Os  Os30  1  0.250  0.537  0.500  1.0
  Os  Os31  1  0.750  0.963  0.000  1.0
  Os  Os32  1  0.763  0.313  0.745  1.0
  Os  Os33  1  0.263  0.187  0.755  1.0
  Os  Os34  1  0.737  0.313  0.255  1.0
  Os  Os35  1  0.237  0.187  0.245  1.0
  Os  Os36  1  0.237  0.687  0.255  1.0
  Os  Os37  1  0.737  0.813  0.245  1.0
  Os  Os38  1  0.263  0.687  0.745  1.0
  Os  Os39  1  0.763  0.813  0.755  1.0
[/CIF]
.
The structure described by Os2Si3 crystallizes in the orthorhombic Pbcn space group. There are three inequivalent Os sites. In the first Os site, Os(3) is bonded in a 7-coordinate geometry to two equivalent Si(1), two equivalent Si(3), and three equivalent Si(2) atoms. In the second Os site, Os(1) is bonded to two equivalent Si(3) and four equivalent Si(1) atoms to form distorted edge-sharing OsSi6 octahedra. In the third Os site, Os(2) is bonded in a 8-coordinate geometry to four equivalent Si(2) and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to two equivalent Os(1) and two equivalent Os(3) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to two equivalent Os(2) and three equivalent Os(3) atoms. In the third Si site, Si(3) is bonded in a 5-coordinate geometry to one Os(1), two equivalent Os(2), and two equivalent Os(3) atoms. is represented by the CIF file [CIF]
data_Si3Os2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.598
_cell_length_b   8.966
_cell_length_c   11.195
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   561.863
_cell_formula_units_Z   8
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  Si0  1  0.603  0.105  0.631  1.0
  Si  Si1  1  0.103  0.395  0.869  1.0
  Si  Si2  1  0.897  0.105  0.369  1.0
  Si  Si3  1  0.397  0.395  0.131  1.0
  Si  Si4  1  0.397  0.895  0.369  1.0
  Si  Si5  1  0.897  0.605  0.131  1.0
  Si  Si6  1  0.103  0.895  0.631  1.0
  Si  Si7  1  0.603  0.605  0.869  1.0
  Si  Si8  1  0.911  0.063  0.819  1.0
  Si  Si9  1  0.411  0.437  0.681  1.0
  Si  Si10  1  0.589  0.063  0.181  1.0
  Si  Si11  1  0.089  0.437  0.319  1.0
  Si  Si12  1  0.089  0.937  0.181  1.0
  Si  Si13  1  0.589  0.563  0.319  1.0
  Si  Si14  1  0.411  0.937  0.819  1.0
  Si  Si15  1  0.911  0.563  0.681  1.0
  Si  Si16  1  0.558  0.704  0.575  1.0
  Si  Si17  1  0.058  0.796  0.925  1.0
  Si  Si18  1  0.942  0.704  0.425  1.0
  Si  Si19  1  0.442  0.796  0.075  1.0
  Si  Si20  1  0.442  0.296  0.425  1.0
  Si  Si21  1  0.942  0.204  0.075  1.0
  Si  Si22  1  0.058  0.296  0.575  1.0
  Si  Si23  1  0.558  0.204  0.925  1.0
  Os  Os24  1  0.750  0.923  0.500  1.0
  Os  Os25  1  0.250  0.577  0.000  1.0
  Os  Os26  1  0.250  0.077  0.500  1.0
  Os  Os27  1  0.750  0.423  0.000  1.0
  Os  Os28  1  0.750  0.463  0.500  1.0
  Os  Os29  1  0.250  0.037  0.000  1.0
  Os  Os30  1  0.250  0.537  0.500  1.0
  Os  Os31  1  0.750  0.963  0.000  1.0
  Os  Os32  1  0.763  0.313  0.745  1.0
  Os  Os33  1  0.263  0.187  0.755  1.0
  Os  Os34  1  0.737  0.313  0.255  1.0
  Os  Os35  1  0.237  0.187  0.245  1.0
  Os  Os36  1  0.237  0.687  0.255  1.0
  Os  Os37  1  0.737  0.813  0.245  1.0
  Os  Os38  1  0.263  0.687  0.745  1.0
  Os  Os39  1  0.763  0.813  0.755  1.0
[/CIF]
.