data_[Rb4Nb2V4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Nb  1.6000  1.4500  0.8200
  V  1.6300  1.3500  0.7775
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [4.1305]
_cell_length_b [4.1305]
_cell_length_c [15.5933]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Rb2NbV2]
_chemical_formula_sum '[Rb4 Nb2 V4]'
_cell_volume [266.0391]
_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
[
  Rb  Rb0  4  0.0000  0.5000  0.2500  1
  Nb  Nb1  2  0.0000  0.0000  0.0000  1
  V  V2  4  0.0000  0.0000  0.4394  1
]