data_ErTm2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.32
_cell_length_b   5.32
_cell_length_c   5.32
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ErTm2Sb
_chemical_formula_sum   'Er1 Tm2 Sb1'
_cell_volume   106.3
_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
  Er  Er0  1  0.76  0.76  0.76  1.0
  Tm  Tm2  1  0.88  0.88  0.88  1.0
  Tm  Tm3  1  0.64  0.64  0.64  1.0
  Sb  Sb1  1  0.0  0.0  0.0  1.0

data_ErTm2Sb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.32
_cell_length_b   5.32
_cell_length_c   13.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   ErTm2Sb
_chemical_formula_sum   'Er3 Tm6 Sb3'
_cell_volume   318.91
_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
  Er  Er0  3  0.0  0.0  0.24  1.0
  Tm  Tm1  3  0.0  0.0  0.12  1.0
  Tm  Tm2  3  0.0  0.0  0.36  1.0
  Sb  Sb3  3  0.0  0.0  -0.0  1.0

Er Tm Tm Sb
Er Tm Tm Sb 0 2 o o o 0 1 o o o 1 3 + + + 
Tm2ErSb is Copper structured and crystallizes in the trigonal R3m space group. The structure is zero-dimensional and consists of three Tm2ErSb clusters. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a distorted single-bond geometry to one Er(1) and one Sb(1) atom. The Tm(1)-Er(1) bond length is 1.56 Å. The Tm(1)-Sb(1) bond length is 1.56 Å. In the second Tm site, Tm(2) is bonded in a distorted single-bond geometry to one Er(1) atom. The Tm(2)-Er(1) bond length is 1.56 Å. Er(1) is bonded in a distorted linear geometry to one Tm(1) and one Tm(2) atom. Sb(1) is bonded in a single-bond geometry to one Tm(1) atom.