data_AlTlCrPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.15
_cell_length_b   5.15
_cell_length_c   5.15
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlTlCrPb
_chemical_formula_sum   'Al1 Tl1 Cr1 Pb1'
_cell_volume   96.61
_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
  Al  Al0  1  0.0  0.0  0.0  1.0
  Tl  Tl3  1  0.64  0.64  0.64  1.0
  Cr  Cr1  1  0.46  0.46  0.46  1.0
  Pb  Pb2  1  0.82  0.82  0.82  1.0

data_AlTlCrPb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.15
_cell_length_b   5.15
_cell_length_c   12.62
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   AlTlCrPb
_chemical_formula_sum   'Al3 Tl3 Cr3 Pb3'
_cell_volume   289.82
_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
  Al  Al0  3  0.0  0.0  0.0  1.0
  Tl  Tl1  3  0.0  0.0  0.36  1.0
  Cr  Cr2  3  0.0  0.0  0.54  1.0
  Pb  Pb3  3  0.0  0.0  0.18  1.0

Al Tl Cr Pb
Al Tl Cr Pb 0 3 - - - 1 2 o o o 1 3 o o o 
CrTlAlPb crystallizes in the trigonal R3m space group. Cr(1) is bonded to one Tl(1) and three equivalent Pb(1) atoms to form CrTlPb3 trigonal pyramids that share  a cornercorner with one Pb(1)AlTlCr3 trigonal bipyramid and corners with six equivalent Cr(1)TlPb3 trigonal pyramids. The Cr(1)-Tl(1) bond length is 2.26 Å. All Cr(1)-Pb(1) bond lengths are 2.99 Å. Tl(1) is bonded in a 1-coordinate geometry to one Cr(1) and one Pb(1) atom. The Tl(1)-Pb(1) bond length is 2.26 Å. Al(1) is bonded in a single-bond geometry to one Pb(1) atom. The Al(1)-Pb(1) bond length is 2.26 Å. Pb(1) is bonded to three equivalent Cr(1), one Tl(1), and one Al(1) atom to form distorted PbAlTlCr3 trigonal bipyramids that share corners with six equivalent Pb(1)AlTlCr3 trigonal bipyramids and  a cornercorner with one Cr(1)TlPb3 trigonal pyramid.