data_[Na8V8O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  V  1.6300  1.3500  0.7775
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Ima2]
_cell_length_a [14.4628]
_cell_length_b [5.6358]
_cell_length_c [5.4047]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [46]
_chemical_formula_structural [Na2V2O5]
_chemical_formula_sum '[Na8 V8 O20]'
_cell_volume [440.5369]
_cell_formula_units_Z [4]
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  8  0.1073  0.5296  0.4975  1.0
  V  V1  4  0.0000  0.0000  0.4933  1.0
  V  V2  4  0.2500  0.0710  0.4563  1.0
  O  O3  8  0.0122  0.2487  0.2809  1.0
  O  O4  8  0.1408  0.5588  0.0228  1.0
  O  O5  4  0.2500  0.1318  0.1128  1.0
]