data_[Na2Sm2Sn2O8]
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
  Sn  1.9600  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P4/nmm]
_cell_length_a [3.7453]
_cell_length_b [3.7453]
_cell_length_c [13.8062]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [129]
_chemical_formula_structural [NaSmSnO4]
_chemical_formula_sum '[Na2 Sm2 Sn2 O8]'
_cell_volume [193.6666]
_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  2  0.0000  0.5000  0.4301  1
  Sm  Sm1  2  0.0000  0.5000  0.0993  1
  Sn  Sn2  2  0.0000  0.5000  0.7311  1
  O  O3  4  0.0000  0.0000  0.2155  1
  O  O4  2  0.0000  0.5000  0.5899  1
  O  O5  2  0.0000  0.5000  0.9362  1
]