data_[Na2U1Nb1N4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  U  1.3800  1.7500  0.9913
  Nb  1.6000  1.4500  0.8200
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [5.7110]
_cell_length_b [3.3383]
_cell_length_c [5.9935]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.9426]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [Na2UNbN4]
_chemical_formula_sum '[Na2 U1 Nb1 N4]'
_cell_volume [108.7091]
_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
[
  Na  Na0  1  0.0000  0.5000  0.5000  1
  Na  Na1  1  0.5000  0.0000  0.5000  1
  U  U2  1  0.5000  0.5000  0.0000  1
  Nb  Nb3  1  0.0000  0.0000  0.0000  1
  N  N4  2  0.2272  0.5000  0.1882  1
  N  N5  2  0.2604  0.0000  0.8087  1
]