data_[Sr6Nb3Pb3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Nb  1.6000  1.4500  0.8200
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.9961]
_cell_length_b [5.9961]
_cell_length_c [14.8545]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Sr2NbPbO6]
_chemical_formula_sum '[Sr6 Nb3 Pb3 O18]'
_cell_volume [462.5155]
_cell_formula_units_Z [3]
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
[
  Sr  Sr0  3  0.0000  0.0000  0.0431  1.0
  Sr  Sr1  3  0.0000  0.0000  0.5431  1.0
  Nb  Nb2  3  0.0000  0.0000  0.3133  1.0
  Pb  Pb3  3  0.0000  0.0000  0.8077  1.0
  O  O4  9  0.0418  0.6137  0.0707  1.0
  O  O5  9  0.0898  0.3535  0.9141  1.0
]