data_AgSn2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   5.16
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AgSn2Sb
_chemical_formula_sum   'Ag1 Sn2 Sb1'
_cell_volume   97.37
_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
  Ag  Ag0  1  0.0  0.0  0.0  1.0
  Sn  Sn2  1  0.48  0.48  0.48  1.0
  Sn  Sn3  1  0.83  0.83  0.83  1.0
  Sb  Sb1  1  0.65  0.65  0.65  1.0

data_AgSn2Sb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   12.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   AgSn2Sb
_chemical_formula_sum   'Ag3 Sn6 Sb3'
_cell_volume   292.12
_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
  Ag  Ag0  3  0.0  0.0  0.0  1.0
  Sn  Sn1  3  0.0  0.0  0.17  1.0
  Sn  Sn2  3  0.0  0.0  0.52  1.0
  Sb  Sb3  3  0.0  0.0  0.35  1.0

Ag Sn Sn Sb
AgSn2Sb crystallizes in the trigonal R3m space group. Ag(1) is bonded to one Sn(2) and three equivalent Sb(1) atoms to form distorted AgSnSb3 trigonal pyramids that share  a cornercorner with one Sb(1)Ag3Sn2 trigonal bipyramid and corners with six equivalent Ag(1)SnSb3 trigonal pyramids. The Ag(1)-Sn(2) bond length is 2.20 Å. All Ag(1)-Sb(1) bond lengths are 2.99 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted single-bond geometry to one Sb(1) atom. The Sn(1)-Sb(1) bond length is 2.20 Å. In the second Sn site, Sn(2) is bonded in a distorted linear geometry to one Ag(1) and one Sb(1) atom. The Sn(2)-Sb(1) bond length is 2.20 Å. Sb(1) is bonded to three equivalent Ag(1), one Sn(1), and one Sn(2) atom to form distorted SbAg3Sn2 trigonal bipyramids that share corners with six equivalent Sb(1)Ag3Sn2 trigonal bipyramids and  a cornercorner with one Ag(1)SnSb3 trigonal pyramid.