data_[Rb2Hf2Nb4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Hf  1.3000  1.5500  0.8500
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [9.7730]
_cell_length_b [6.1835]
_cell_length_c [7.8609]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.5558]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [RbHfNb2O8]
_chemical_formula_sum '[Rb2 Hf2 Nb4 O16]'
_cell_volume [450.3533]
_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  2  0.0000  0.0000  0.5000  1.0
  Hf  Hf1  2  0.0000  0.0000  0.0000  1.0
  Nb  Nb2  4  0.0833  0.5000  0.7493  1.0
  O  O3  8  0.0168  0.2403  0.8205  1.0
  O  O4  4  0.1123  0.5000  0.5123  1.0
  O  O5  4  0.2220  0.0000  0.1202  1.0
]