data_SiB2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.2
_cell_length_b   4.2
_cell_length_c   4.2
_cell_angle_alpha   118.39
_cell_angle_beta   118.39
_cell_angle_gamma   92.82
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiB2Sb
_chemical_formula_sum   'Si1 B2 Sb1'
_cell_volume   53.69
_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
  B  B0  1  0.15  0.0  0.45  1.0
  B  B1  1  0.0  0.15  0.45  1.0
  Sb  Sb2  1  0.0  0.0  0.9  1.0

data_SiB2Sb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.8
_cell_length_b   6.09
_cell_length_c   4.2
_cell_angle_alpha   90.0
_cell_angle_beta   133.59
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SiB2Sb
_chemical_formula_sum   'Si2 B4 Sb2'
_cell_volume   107.39
_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
  Si  Si0  2  0.0  0.0  0.0  1.0
  B  B1  4  0.13  0.42  0.55  1.0
  Sb  Sb2  2  0.1  0.0  0.1  1.0

Si B B Sb
B2SiSb is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two B2SiSb clusters. B(1) is bonded in a 2-coordinate geometry to one B(1) and one Si(1) atom. The B(1)-B(1) bond length is 0.93 Å. The B(1)-Si(1) bond length is 1.68 Å. Si(1) is bonded in a single-bond geometry to two equivalent B(1) and one Sb(1) atom. The Si(1)-Sb(1) bond length is 0.43 Å. Sb(1) is bonded in a single-bond geometry to one Si(1) atom.