data_SmAl2Pb
_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   SmAl2Pb
_chemical_formula_sum   'Sm1 Al2 Pb1'
_cell_volume   97.53
_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
  Sm  Sm3  1  0.0  0.0  0.0  1.0
  Al  Al0  1  0.83  0.83  0.83  1.0
  Al  Al1  1  0.48  0.48  0.48  1.0
  Pb  Pb2  1  0.65  0.65  0.65  1.0

data_SmAl2Pb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   12.66
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SmAl2Pb
_chemical_formula_sum   'Sm3 Al6 Pb3'
_cell_volume   292.58
_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
  Sm  Sm0  3  0.0  0.0  0.0  1.0
  Al  Al1  3  0.0  0.0  0.17  1.0
  Al  Al2  3  0.0  0.0  0.52  1.0
  Pb  Pb3  3  0.0  0.0  0.35  1.0

Sm Al Al Pb
SmAl2Pb crystallizes in the trigonal R3m space group. Sm(1) is bonded to one Al(1) and three equivalent Pb(1) atoms to form distorted SmAlPb3 trigonal pyramids that share  a cornercorner with one Pb(1)Sm3Al2 trigonal bipyramid and corners with six equivalent Sm(1)AlPb3 trigonal pyramids. The Sm(1)-Al(1) bond length is 2.19 Å. All Sm(1)-Pb(1) bond lengths are 2.99 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a linear geometry to one Sm(1) and one Pb(1) atom. The Al(1)-Pb(1) bond length is 2.19 Å. In the second Al site, Al(2) is bonded in a single-bond geometry to one Pb(1) atom. The Al(2)-Pb(1) bond length is 2.19 Å. Pb(1) is bonded to three equivalent Sm(1), one Al(1), and one Al(2) atom to form PbSm3Al2 trigonal bipyramids that share corners with six equivalent Pb(1)Sm3Al2 trigonal bipyramids and  a cornercorner with one Sm(1)AlPb3 trigonal pyramid.