data_W3C4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.68
_cell_length_b   4.68
_cell_length_c   4.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   W3C4
_chemical_formula_sum   'W3 C4'
_cell_volume   102.39
_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
  W  W4  1  0.34  0.0  0.34  1.0
  W  W5  1  0.34  0.34  0.0  1.0
  W  W6  1  0.0  0.34  0.34  1.0
  C  C0  1  0.22  0.46  0.22  1.0
  C  C1  1  0.46  0.22  0.22  1.0
  C  C2  1  0.46  0.46  0.46  1.0
  C  C3  1  0.22  0.22  0.46  1.0

data_W3C4
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.62
_cell_length_b   6.62
_cell_length_c   8.1
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   W3C4
_chemical_formula_sum   'W9 C12'
_cell_volume   307.16
_cell_formula_units_Z   3
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+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  W  W0  9  0.11  0.55  0.89  1.0
  C  C1  9  0.16  0.08  0.3  1.0
  C  C2  3  0.0  0.0  0.46  1.0

W W W C C C C
W W W C C C C 0 6 o o o 0 4 o o o 1 3 o o o 1 4 o o o 2 6 o o o 2 3 o o o 3 5 o o o 4 5 o o o 5 6 o o o 
W3C4 crystallizes in the trigonal R3m space group. W(1) is bonded in a 2-coordinate geometry to one C(2) and three equivalent C(1) atoms. The W(1)-C(2) bond length is 2.65 Å. There are two shorter (1.30 Å) and one longer (2.65 Å) W(1)-C(1) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to three equivalent W(1), one C(2), and two equivalent C(1) atoms. The C(1)-C(2) bond length is 1.61 Å. Both C(1)-C(1) bond lengths are 1.61 Å. In the second C site, C(2) is bonded in a 6-coordinate geometry to three equivalent W(1) and three equivalent C(1) atoms.