data_[Sr3Sm6Sn3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  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 [R3]
_cell_length_a [5.9160]
_cell_length_b [5.9160]
_cell_length_c [15.4949]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [SrSm2SnO6]
_chemical_formula_sum '[Sr3 Sm6 Sn3 O18]'
_cell_volume [469.6509]
_cell_formula_units_Z [3]
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
[
  Sr  Sr0  3  0.0000  0.0000  0.1996  1
  Sm  Sm1  3  0.0000  0.0000  0.4712  1
  Sm  Sm2  3  0.0000  0.0000  0.9772  1
  Sn  Sn3  3  0.0000  0.0000  0.6822  1
  O  O4  9  0.0038  0.3672  0.4133  1
  O  O5  9  0.0178  0.7383  0.5894  1
]