data_[Pm2Sm2Er4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Sm  1.1700  1.8500  1.2290
  Er  1.2400  1.7500  1.0300
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [8.4849]
_cell_length_b [3.6319]
_cell_length_c [8.4968]
_cell_angle_alpha [90.0000]
_cell_angle_beta [95.3080]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [PmSmEr2]
_chemical_formula_sum '[Pm2 Sm2 Er4]'
_cell_volume [260.7171]
_cell_formula_units_Z [2]
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  2  0.3336  0.2500  0.9153  1
  Sm  Sm1  2  0.1659  0.7500  0.5837  1
  Er  Er2  2  0.0833  0.7500  0.1672  1
  Er  Er3  2  0.4162  0.2500  0.3338  1
]