The structure described by BaSi2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to two equivalent Si(3), three equivalent Si(2), and six equivalent Si(1) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to two equivalent Si(2), three equivalent Si(3), and four equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Ba(2), three equivalent Ba(1), one Si(1), one Si(2), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Ba(2), three equivalent Ba(1), one Si(3), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Ba(1), three equivalent Ba(2), one Si(2), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_BaSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.787
_cell_length_b   9.027
_cell_length_c   11.645
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   713.476
_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
  Ba  Ba0  1  0.250  0.341  0.405  1.0
  Ba  Ba1  1  0.750  0.659  0.595  1.0
  Ba  Ba2  1  0.250  0.841  0.095  1.0
  Ba  Ba3  1  0.750  0.159  0.905  1.0
  Ba  Ba4  1  0.250  0.515  0.807  1.0
  Ba  Ba5  1  0.750  0.485  0.193  1.0
  Ba  Ba6  1  0.250  0.015  0.693  1.0
  Ba  Ba7  1  0.750  0.985  0.307  1.0
  Si  Si8  1  0.926  0.305  0.644  1.0
  Si  Si9  1  0.426  0.695  0.356  1.0
  Si  Si10  1  0.574  0.805  0.856  1.0
  Si  Si11  1  0.074  0.195  0.144  1.0
  Si  Si12  1  0.074  0.695  0.356  1.0
  Si  Si13  1  0.574  0.305  0.644  1.0
  Si  Si14  1  0.426  0.195  0.144  1.0
  Si  Si15  1  0.926  0.805  0.856  1.0
  Si  Si16  1  0.750  0.801  0.033  1.0
  Si  Si17  1  0.250  0.199  0.967  1.0
  Si  Si18  1  0.750  0.301  0.467  1.0
  Si  Si19  1  0.250  0.699  0.533  1.0
  Si  Si20  1  0.750  0.586  0.910  1.0
  Si  Si21  1  0.250  0.414  0.090  1.0
  Si  Si22  1  0.750  0.086  0.590  1.0
  Si  Si23  1  0.250  0.914  0.410  1.0
[/CIF]
.
The structure described by BaSi2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to two equivalent Si(3), three equivalent Si(2), and six equivalent Si(1) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to two equivalent Si(2), three equivalent Si(3), and four equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Ba(2), three equivalent Ba(1), one Si(1), one Si(2), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Ba(2), three equivalent Ba(1), one Si(3), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Ba(1), three equivalent Ba(2), one Si(2), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_BaSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.787
_cell_length_b   9.027
_cell_length_c   11.645
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   713.476
_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
  Ba  Ba0  1  0.250  0.341  0.405  1.0
  Ba  Ba1  1  0.750  0.659  0.595  1.0
  Ba  Ba2  1  0.250  0.841  0.095  1.0
  Ba  Ba3  1  0.750  0.159  0.905  1.0
  Ba  Ba4  1  0.250  0.515  0.807  1.0
  Ba  Ba5  1  0.750  0.485  0.193  1.0
  Ba  Ba6  1  0.250  0.015  0.693  1.0
  Ba  Ba7  1  0.750  0.985  0.307  1.0
  Si  Si8  1  0.926  0.305  0.644  1.0
  Si  Si9  1  0.426  0.695  0.356  1.0
  Si  Si10  1  0.574  0.805  0.856  1.0
  Si  Si11  1  0.074  0.195  0.144  1.0
  Si  Si12  1  0.074  0.695  0.356  1.0
  Si  Si13  1  0.574  0.305  0.644  1.0
  Si  Si14  1  0.426  0.195  0.144  1.0
  Si  Si15  1  0.926  0.805  0.856  1.0
  Si  Si16  1  0.750  0.801  0.033  1.0
  Si  Si17  1  0.250  0.199  0.967  1.0
  Si  Si18  1  0.750  0.301  0.467  1.0
  Si  Si19  1  0.250  0.699  0.533  1.0
  Si  Si20  1  0.750  0.586  0.910  1.0
  Si  Si21  1  0.250  0.414  0.090  1.0
  Si  Si22  1  0.750  0.086  0.590  1.0
  Si  Si23  1  0.250  0.914  0.410  1.0
[/CIF]
.