data_SiC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.09
_cell_length_b   3.09
_cell_length_c   15.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiC
_chemical_formula_sum   'Si6 C6'
_cell_volume   125.96
_cell_formula_units_Z   6
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  0.55  0.89  0.06  1.0
  Si  Si1  1  0.0  0.79  0.65  1.0
  Si  Si2  1  0.0  0.79  0.53  1.0
  Si  Si3  1  0.55  0.89  0.12  1.0
  Si  Si4  1  0.0  0.0  0.18  1.0
  Si  Si5  1  0.0  0.0  0.59  1.0
  C  C6  1  0.0  0.0  0.68  1.0
  C  C7  1  0.0  0.0  0.28  1.0
  C  C8  1  0.55  0.89  0.16  1.0
  C  C9  1  0.0  0.79  0.75  1.0
  C  C10  1  0.0  0.79  0.63  1.0
  C  C11  1  0.55  0.89  0.22  1.0

data_SiC
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.09
_cell_length_b   3.09
_cell_length_c   15.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiC
_chemical_formula_sum   'Si6 C6'
_cell_volume   125.96
_cell_formula_units_Z   6
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  0.0  0.0  0.18  1.0
  Si  Si1  1  0.0  0.0  0.59  1.0
  Si  Si2  1  0.0  0.79  0.53  1.0
  Si  Si3  1  0.0  0.79  0.65  1.0
  Si  Si4  1  0.55  0.89  0.06  1.0
  Si  Si5  1  0.55  0.89  0.12  1.0
  C  C6  1  0.0  0.0  0.28  1.0
  C  C7  1  0.0  0.0  0.68  1.0
  C  C8  1  0.0  0.79  0.63  1.0
  C  C9  1  0.0  0.79  0.75  1.0
  C  C10  1  0.55  0.89  0.16  1.0
  C  C11  1  0.55  0.89  0.22  1.0

Si Si Si Si Si Si C C C C C C
SiC is Indium-like structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of two SiC clusters. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a single-bond geometry to one Si(4) atom. The Si(1)-Si(4) bond length is 0.98 Å. In the second Si site, Si(4) is bonded in a single-bond geometry to one Si(1) and one C(3) atom. The Si(4)-C(3) bond length is 0.57 Å. In the third Si site, Si(5) is bonded in a 3-coordinate geometry to one C(2), one C(3), and one C(6) atom. The Si(5)-C(2) bond length is 1.46 Å. The Si(5)-C(3) bond length is 1.31 Å. The Si(5)-C(6) bond length is 1.42 Å. There are three inequivalent C sites. In the first C site, C(2) is bonded in a distorted single-bond geometry to one Si(5) atom. In the second C site, C(3) is bonded in a distorted single-bond geometry to one Si(4), one Si(5), and one C(6) atom. The C(3)-C(6) bond length is 0.98 Å. In the third C site, C(6) is bonded in a 2-coordinate geometry to one Si(5) and one C(3) atom.