data_Ta3AsW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.88
_cell_length_b   4.88
_cell_length_c   4.88
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta3AsW
_chemical_formula_sum   'Ta3 As1 W1'
_cell_volume   116.45
_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
  Ta  Ta2  1  0.44  0.0  0.44  1.0
  Ta  Ta3  1  0.44  0.44  0.0  1.0
  Ta  Ta4  1  0.0  0.44  0.44  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  W  W1  1  0.44  0.44  0.44  1.0

data_Ta3AsW
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.91
_cell_length_b   6.91
_cell_length_c   8.46
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Ta3AsW
_chemical_formula_sum   'Ta9 As3 W3'
_cell_volume   349.35
_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
  Ta  Ta0  9  0.04  0.52  0.96  1.0
  As  As1  3  0.0  0.0  0.0  1.0
  W  W2  3  0.0  0.0  0.44  1.0

Ta Ta Ta As W
Ta Ta Ta As W 0 4 o o o 0 3 + o + 0 3 + o o 0 3 o o + 0 3 o o o 1 4 o o o 1 3 + + o 1 3 + o o 1 3 o + o 1 3 o o o 2 4 o o o 2 3 o + + 2 3 o + o 2 3 o o + 2 3 o o o 3 4 o o o 
Ta3WAs crystallizes in the trigonal R3m space group. Ta(1) is bonded in a 1-coordinate geometry to two equivalent W(1) and three equivalent As(1) atoms. There is one shorter (2.16 Å) and one longer (2.73 Å) Ta(1)-W(1) bond length. There is one shorter (3.05 Å) and two longer (3.48 Å) Ta(1)-As(1) bond lengths. W(1) is bonded to six equivalent Ta(1) atoms to form corner-sharing WTa6 octahedra. The corner-sharing octahedra are not tilted. As(1) is bonded in a distorted q6 geometry to nine equivalent Ta(1) atoms.