data_[Sm4Nb4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [7.2978]
_cell_length_b [11.3553]
_cell_length_c [5.2164]
_cell_angle_alpha [90.0000]
_cell_angle_beta [131.9428]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [SmNbO4]
_chemical_formula_sum '[Sm4 Nb4 O16]'
_cell_volume [321.5353]
_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
[
  Sm  Sm0  4  0.0000  0.3720  0.2500  1.0
  Nb  Nb1  4  0.0000  0.1087  0.7500  1.0
  O  O2  8  0.1561  0.7915  0.1588  1.0
  O  O3  8  0.2473  0.0333  0.1929  1.0
]