data_[Sm2Nb2O8]
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 [P2/c]
_cell_length_a [5.2275]
_cell_length_b [5.5961]
_cell_length_c [5.4520]
_cell_angle_alpha [90.0000]
_cell_angle_beta [95.9857]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [13]
_chemical_formula_structural [SmNbO4]
_chemical_formula_sum '[Sm2 Nb2 O8]'
_cell_volume [158.6203]
_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
[
  Sm  Sm0  2  0.5000  0.2588  0.2500  1.0
  Nb  Nb1  2  0.0000  0.1982  0.7500  1.0
  O  O2  4  0.2334  0.0597  0.5185  1.0
  O  O3  4  0.2454  0.4151  0.8983  1.0
]