data_[Pm1Pr2Er1Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Pr  1.1300  1.8500  1.0600
  Er  1.2400  1.7500  1.0300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [7.2274]
_cell_length_b [4.1214]
_cell_length_c [7.3874]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.6095]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [PmPr2ErSe4]
_chemical_formula_sum '[Pm1 Pr2 Er1 Se4]'
_cell_volume [208.5408]
_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
[
  Pr  Pr0  1  0.0000  0.5000  0.5000  1
  Pr  Pr1  1  0.5000  0.0000  0.5000  1
  Pm  Pm2  1  0.5000  0.5000  0.0000  1
  Er  Er3  1  0.0000  0.0000  0.0000  1
  Se  Se4  2  0.2372  0.5000  0.2332  1
  Se  Se5  2  0.2468  0.0000  0.7617  1
]