data_ErTm2Te
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.39
_cell_length_b   5.39
_cell_length_c   5.39
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ErTm2Te
_chemical_formula_sum   'Er1 Tm2 Te1'
_cell_volume   110.69
_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  0.81  0.81  0.81  1.0
  Tm  Tm2  1  0.91  0.91  0.91  1.0
  Tm  Tm3  1  0.72  0.72  0.72  1.0
  Te  Te1  1  0.0  0.0  0.0  1.0

data_ErTm2Te
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.39
_cell_length_b   5.39
_cell_length_c   13.2
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   ErTm2Te
_chemical_formula_sum   'Er3 Tm6 Te3'
_cell_volume   332.08
_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  0.19  1.0
  Tm  Tm1  3  0.0  0.0  0.09  1.0
  Tm  Tm2  3  0.0  0.0  0.28  1.0
  Te  Te3  3  0.0  0.0  0.0  1.0

Er Tm Tm Te
Tm2ErTe crystallizes in the trigonal R3m space group. 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 Te(1) atom. The Tm(1)-Er(1) bond length is 1.25 Å. The Tm(1)-Te(1) bond length is 1.25 Å. In the second Tm site, Tm(2) is bonded to one Er(1) and three equivalent Te(1) atoms to form distorted corner-sharing TmErTe3 tetrahedra. The Tm(2)-Er(1) bond length is 1.25 Å. All Tm(2)-Te(1) bond lengths are 3.18 Å. Er(1) is bonded in a linear geometry to one Tm(1) and one Tm(2) atom. Te(1) is bonded in a single-bond geometry to one Tm(1) and three equivalent Tm(2) atoms.