data_[Na4Sm4Ir4O16]
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
  Ir  2.2000  1.3500  0.7650
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [6.5338]
_cell_length_b [7.1040]
_cell_length_c [8.9681]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [NaSmIrO4]
_chemical_formula_sum '[Na4 Sm4 Ir4 O16]'
_cell_volume [416.2648]
_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
[
  Na  Na0  4  0.0000  0.2500  0.8848  1.0
  Sm  Sm1  4  0.0000  0.0000  0.5000  1.0
  Ir  Ir2  4  0.2500  0.2500  0.2500  1.0
  O  O3  8  0.0000  0.0708  0.2423  1.0
  O  O4  8  0.2238  0.2500  0.4784  1.0
]