data_[Pm2Cu2Ni8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Cu  1.9000  1.3500  0.8200
  Ni  1.9100  1.3500  0.7400
]
_symmetry_space_group_name_H-M [Pmma]
_cell_length_a [6.8097]
_cell_length_b [3.8830]
_cell_length_c [6.5217]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [51]
_chemical_formula_structural [PmCuNi4]
_chemical_formula_sum '[Pm2 Cu2 Ni8]'
_cell_volume [172.4449]
_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  0.2500  0.0000  0.3533  1
  Cu  Cu1  2  0.2500  0.0000  0.7668  1
  Ni  Ni2  4  0.0515  0.5000  0.7042  1
  Ni  Ni3  2  0.0000  0.0000  0.0000  1
  Ni  Ni4  2  0.2500  0.5000  0.0213  1
]