data_[Na4Nb4H2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  H  2.2000  0.2500  0.0000
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [9.2984]
_cell_length_b [9.2984]
_cell_length_c [3.1535]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [Na2Nb2H]
_chemical_formula_sum '[Na4 Nb4 H2]'
_cell_volume [272.6485]
_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
[
  Na  Na0  4  0.2053  0.2947  0.0000  1
  Nb  Nb1  4  0.0839  0.5839  0.5000  1
  H  H2  2  0.0000  0.0000  0.0000  1
]