data_SrYTa3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.14
_cell_length_b   5.14
_cell_length_c   5.14
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrYTa3
_chemical_formula_sum   'Sr1 Y1 Ta3'
_cell_volume   136.12
_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  Sr1  1  0.0  0.0  0.0  1.0
  Y  Y0  1  0.57  0.57  0.57  1.0
  Ta  Ta2  1  0.57  0.0  0.57  1.0
  Ta  Ta3  1  0.57  0.57  0.0  1.0
  Ta  Ta4  1  0.0  0.57  0.57  1.0

data_SrYTa3
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.27
_cell_length_b   7.27
_cell_length_c   8.91
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrYTa3
_chemical_formula_sum   'Sr3 Y3 Ta9'
_cell_volume   408.35
_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
  Sr  Sr0  3  0.0  0.0  0.0  1.0
  Y  Y1  3  0.0  0.0  0.57  1.0
  Ta  Ta2  9  0.19  0.38  0.38  1.0

Sr Y Ta Ta Ta
SrYTa3 crystallizes in the trigonal R3m space group. Sr(1) is bonded to twelve equivalent Ta(1) atoms to form distorted SrTa12 cuboctahedra that share corners with twelve equivalent Sr(1)Ta12 cuboctahedra, faces with six equivalent Sr(1)Ta12 cuboctahedra, and faces with eight equivalent Y(1)Ta6 octahedra. There are a spread of Sr(1)-Ta(1) bond distances ranging from 3.11-4.16 Å. Y(1) is bonded to six equivalent Ta(1) atoms to form YTa6 octahedra that share corners with six equivalent Y(1)Ta6 octahedra and faces with eight equivalent Sr(1)Ta12 cuboctahedra. The corner-sharing octahedra are not tilted. There are three shorter (2.20 Å) and three longer (2.94 Å) Y(1)-Ta(1) bond lengths. Ta(1) is bonded in a 1-coordinate geometry to four equivalent Sr(1) and two equivalent Y(1) atoms.