data_BeSnW3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.87
_cell_length_b   4.87
_cell_length_c   4.87
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeSnW3
_chemical_formula_sum   'Be1 Sn1 W3'
_cell_volume   115.76
_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
  Be  Be0  1  0.0  0.0  0.0  1.0
  Sn  Sn1  1  0.44  0.44  0.44  1.0
  W  W2  1  0.44  0.0  0.44  1.0
  W  W3  1  0.44  0.44  0.0  1.0
  W  W4  1  0.0  0.44  0.44  1.0

data_BeSnW3
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.89
_cell_length_b   6.89
_cell_length_c   8.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   BeSnW3
_chemical_formula_sum   'Be3 Sn3 W9'
_cell_volume   347.29
_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
  Be  Be0  3  0.0  0.0  0.0  1.0
  Sn  Sn1  3  0.0  0.0  0.44  1.0
  W  W2  9  0.04  0.52  0.96  1.0

Be Sn W W W
BeW3Sn crystallizes in the trigonal R3m space group. Be(1) is bonded in a 3-coordinate geometry to three equivalent W(1) atoms. All Be(1)-W(1) bond lengths are 3.01 Å. W(1) is bonded in a distorted T-shaped geometry to one Be(1) and two equivalent Sn(1) atoms. There is one shorter (2.13 Å) and one longer (2.74 Å) W(1)-Sn(1) bond length. Sn(1) is bonded to six equivalent W(1) atoms to form corner-sharing SnW6 octahedra. The corner-sharing octahedra are not tilted.