data_SrAs2W
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.91
_cell_length_b   4.91
_cell_length_c   4.91
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAs2W
_chemical_formula_sum   'Sr1 As2 W1'
_cell_volume   83.61
_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
  Sr  Sr2  1  0.47  0.47  0.47  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  As  As1  1  0.21  0.21  0.21  1.0
  W  W3  1  0.74  0.74  0.74  1.0

data_SrAs2W
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.91
_cell_length_b   4.91
_cell_length_c   12.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrAs2W
_chemical_formula_sum   'Sr3 As6 W3'
_cell_volume   250.83
_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
  Sr  Sr0  3  0.0  0.0  0.53  1.0
  As  As1  3  0.0  0.0  0.0  1.0
  As  As2  3  0.0  0.0  0.79  1.0
  W  W3  3  0.0  0.0  0.26  1.0

Sr As As W
SrWAs2 crystallizes in the trigonal R3m space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent W(1), three equivalent As(1), and four equivalent As(2) atoms. There are three shorter (2.95 Å) and one longer (3.18 Å) Sr(1)-W(1) bond length. All Sr(1)-As(1) bond lengths are 3.28 Å. There are three shorter (2.95 Å) and one longer (3.18 Å) Sr(1)-As(2) bond length. W(1) is bonded in a 11-coordinate geometry to four equivalent Sr(1), three equivalent As(2), and four equivalent As(1) atoms. All W(1)-As(2) bond lengths are 3.28 Å. There are three shorter (2.95 Å) and one longer (3.18 Å) W(1)-As(1) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to three equivalent Sr(1), four equivalent W(1), and one As(2) atom. The As(1)-As(2) bond length is 2.48 Å. In the second As site, As(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1), three equivalent W(1), and one As(1) atom.