data_SrAlTlAg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.21
_cell_length_b   5.21
_cell_length_c   5.21
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAlTlAg
_chemical_formula_sum   'Sr1 Al1 Tl1 Ag1'
_cell_volume   99.97
_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  0.53  0.53  0.53  1.0
  Al  Al1  1  0.0  0.0  0.0  1.0
  Tl  Tl3  1  0.68  0.68  0.68  1.0
  Ag  Ag0  1  0.84  0.84  0.84  1.0

data_SrAlTlAg
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.21
_cell_length_b   5.21
_cell_length_c   12.76
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrAlTlAg
_chemical_formula_sum   'Sr3 Al3 Tl3 Ag3'
_cell_volume   299.91
_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  0.47  1.0
  Al  Al1  3  0.0  0.0  0.0  1.0
  Tl  Tl2  3  0.0  0.0  0.32  1.0
  Ag  Ag3  3  0.0  0.0  0.16  1.0

Sr Al Tl Ag
SrAgTlAl crystallizes in the trigonal R3m space group. Sr(1) is bonded to three equivalent Ag(1) and one Tl(1) atom to form distorted SrTlAg3 trigonal pyramids that share  a cornercorner with one Ag(1)Sr3AlTl trigonal bipyramid and corners with six equivalent Sr(1)TlAg3 trigonal pyramids. All Sr(1)-Ag(1) bond lengths are 3.02 Å. The Sr(1)-Tl(1) bond length is 2.02 Å. Ag(1) is bonded to three equivalent Sr(1), one Tl(1), and one Al(1) atom to form AgSr3AlTl trigonal bipyramids that share corners with six equivalent Ag(1)Sr3AlTl trigonal bipyramids and  a cornercorner with one Sr(1)TlAg3 trigonal pyramid. The Ag(1)-Tl(1) bond length is 2.02 Å. The Ag(1)-Al(1) bond length is 2.02 Å. Tl(1) is bonded in a linear geometry to one Sr(1) and one Ag(1) atom. Al(1) is bonded in a single-bond geometry to one Ag(1) atom.