data_SrTlZnCr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   5.17
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrTlZnCr
_chemical_formula_sum   'Sr1 Tl1 Zn1 Cr1'
_cell_volume   97.8
_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  0.66  0.66  0.66  1.0
  Tl  Tl2  1  0.83  0.83  0.83  1.0
  Zn  Zn3  1  0.49  0.49  0.49  1.0
  Cr  Cr0  1  0.0  0.0  0.0  1.0

data_SrTlZnCr
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   12.67
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrTlZnCr
_chemical_formula_sum   'Sr3 Tl3 Zn3 Cr3'
_cell_volume   293.4
_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  0.34  1.0
  Tl  Tl1  3  0.0  0.0  0.17  1.0
  Zn  Zn2  3  0.0  0.0  0.51  1.0
  Cr  Cr3  3  0.0  0.0  0.0  1.0

Sr Tl Zn Cr
Sr Tl Zn Cr 0 2 o o o 0 1 o o o 1 3 + + + 
SrCrZnTl crystallizes in the trigonal R3m space group. Sr(1) is bonded to three equivalent Cr(1), one Zn(1), and one Tl(1) atom to form distorted SrTlZnCr3 trigonal bipyramids that share corners with six equivalent Sr(1)TlZnCr3 trigonal bipyramids and  a cornercorner with one Cr(1)Sr3Tl trigonal pyramid. All Sr(1)-Cr(1) bond lengths are 2.99 Å. The Sr(1)-Zn(1) bond length is 2.17 Å. The Sr(1)-Tl(1) bond length is 2.17 Å. Cr(1) is bonded to three equivalent Sr(1) and one Tl(1) atom to form CrSr3Tl trigonal pyramids that share  a cornercorner with one Sr(1)TlZnCr3 trigonal bipyramid and corners with six equivalent Cr(1)Sr3Tl trigonal pyramids. The Cr(1)-Tl(1) bond length is 2.17 Å. Zn(1) is bonded in a single-bond geometry to one Sr(1) atom. Tl(1) is bonded in a 1-coordinate geometry to one Sr(1) and one Cr(1) atom.