data_[Np2Ni18Sn4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Np  1.3600  1.7500  1.0000
  Ni  1.9100  1.3500  0.7400
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [8.2042]
_cell_length_b [8.2042]
_cell_length_c [4.8711]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [NpNi9Sn2]
_chemical_formula_sum '[Np2 Ni18 Sn4]'
_cell_volume [327.8730]
_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
[
  Np  Np0  2  0.0000  0.0000  0.0000  1
  Ni  Ni1  8  0.0649  0.2027  0.5000  1
  Ni  Ni2  8  0.1744  0.6744  0.2458  1
  Ni  Ni3  2  0.0000  0.5000  0.5000  1
  Sn  Sn4  4  0.1273  0.3727  0.0000  1
]