data_[Na4Sm4O6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sm  1.1700  1.8500  1.2290
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [6.5795]
_cell_length_b [6.0694]
_cell_length_c [7.1119]
_cell_angle_alpha [90.0000]
_cell_angle_beta [120.3303]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na2Sm2O3]
_chemical_formula_sum '[Na4 Sm4 O6]'
_cell_volume [245.1334]
_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
[
  Na  Na0  4  0.3877  0.1539  0.1206  1
  Sm  Sm1  4  0.1435  0.6460  0.8859  1
  O  O2  4  0.1999  0.5485  0.2279  1
  O  O3  2  0.5000  0.0000  0.5000  1
]