data_PtW2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.22
_cell_length_b   5.22
_cell_length_c   5.22
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PtW2
_chemical_formula_sum   'Pt2 W4'
_cell_volume   100.69
_cell_formula_units_Z   2
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
  Pt  Pt0  1  0.85  0.85  0.85  1.0
  Pt  Pt1  1  0.0  0.0  0.0  1.0
  W  W2  1  0.62  0.77  0.77  1.0
  W  W3  1  0.77  0.62  0.77  1.0
  W  W4  1  0.77  0.77  0.62  1.0
  W  W5  1  0.62  0.62  0.62  1.0

data_PtW2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.22
_cell_length_b   5.22
_cell_length_c   12.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   PtW2
_chemical_formula_sum   'Pt6 W12'
_cell_volume   302.06
_cell_formula_units_Z   6
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
  Pt  Pt0  3  0.0  0.0  0.0  1.0
  Pt  Pt1  3  0.0  0.0  0.15  1.0
  W  W2  9  0.1  0.05  0.28  1.0
  W  W3  3  0.0  0.0  0.38  1.0

Pt Pt W W W W
Pt Pt W W W W 0 4 o o o 0 3 o o o 0 2 o o o 0 1 + + + 2 3 o o o 2 4 o o o 2 5 o o o 3 4 o o o 3 5 o o o 4 5 o o o 
PtW2 crystallizes in the trigonal R3m space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 5-coordinate geometry to one W(2), two equivalent W(1), one Pt(1), and one Pt(2) atom. The W(1)-W(2) bond length is 1.39 Å. Both W(1)-W(1) bond lengths are 0.80 Å. The W(1)-Pt(1) bond length is 1.70 Å. The W(1)-Pt(2) bond length is 2.63 Å. In the second W site, W(2) is bonded in a 3-coordinate geometry to three equivalent W(1) and three equivalent Pt(1) atoms. All W(2)-Pt(1) bond lengths are 3.29 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 7-coordinate geometry to three equivalent W(1), three equivalent W(2), and one Pt(2) atom. The Pt(1)-Pt(2) bond length is 1.97 Å. In the second Pt site, Pt(2) is bonded in a tetrahedral geometry to three equivalent W(1) and one Pt(1) atom.