data_[Pm1Nd1Tl2Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Nd  1.1400  1.8500  1.2765
  Tl  1.6200  1.9000  1.3325
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [7.4669]
_cell_length_b [4.3120]
_cell_length_c [8.1432]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.7851]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [PmNd(TlSe2)2]
_chemical_formula_sum '[Pm1 Nd1 Tl2 Se4]'
_cell_volume [249.6585]
_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
[
  Pm  Pm0  1  0.0000  0.0000  0.0000  1
  Nd  Nd1  1  0.5000  0.5000  0.0000  1
  Tl  Tl2  1  0.0000  0.5000  0.5000  1
  Tl  Tl3  1  0.5000  0.0000  0.5000  1
  Se  Se4  2  0.2350  0.5000  0.2099  1
  Se  Se5  2  0.2616  0.0000  0.7894  1
]