data_[Pm4Sm2Er1Mg1]
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
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [P4/mmm]
_cell_length_a [5.0539]
_cell_length_b [5.0539]
_cell_length_c [10.1115]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [123]
_chemical_formula_structural [Pm4Sm2ErMg]
_chemical_formula_sum '[Pm4 Sm2 Er1 Mg1]'
_cell_volume [258.2638]
_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  4  0.0000  0.5000  0.2479  1
  Sm  Sm1  1  0.0000  0.0000  0.5000  1
  Sm  Sm2  1  0.5000  0.5000  0.0000  1
  Er  Er3  1  0.5000  0.5000  0.5000  1
  Mg  Mg4  1  0.0000  0.0000  0.0000  1
]