data_[K4Pm8Tl4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Pm  1.1300  1.8500  1.1100
  Tl  1.6200  1.9000  1.3325
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I4/mcm]
_cell_length_a [6.8340]
_cell_length_b [6.8340]
_cell_length_c [12.5032]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [140]
_chemical_formula_structural [KPm2TlO5]
_chemical_formula_sum '[K4 Pm8 Tl4 O20]'
_cell_volume [583.9518]
_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
[
  K  K0  4  0.0000  0.0000  0.2500  1
  Pm  Pm1  8  0.1774  0.3226  0.0000  1
  Tl  Tl2  4  0.0000  0.5000  0.2500  1
  O  O3  16  0.1425  0.3575  0.3814  1
  O  O4  4  0.0000  0.0000  0.0000  1
]