data_[K2Ca4Ta6O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Ca  1.0000  1.8000  1.1400
  Ta  1.5000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [3.9409]
_cell_length_b [3.9455]
_cell_length_c [30.2584]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [KCa2Ta3O10]
_chemical_formula_sum '[K2 Ca4 Ta6 O20]'
_cell_volume [470.4818]
_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
[
  K  K0  2  0.0000  0.0000  0.7585  1.0
  Ca  Ca1  2  0.0000  0.0000  0.0766  1.0
  Ca  Ca2  2  0.0000  0.0000  0.9247  1.0
  Ta  Ta3  2  0.5000  0.0000  0.3584  1.0
  Ta  Ta4  2  0.5000  0.0000  0.5001  1.0
  Ta  Ta5  2  0.5000  0.0000  0.6416  1.0
  O  O6  2  0.0000  0.0000  0.3719  1.0
  O  O7  2  0.0000  0.0000  0.4995  1.0
  O  O8  2  0.0000  0.0000  0.6275  1.0
  O  O9  2  0.5000  0.0000  0.1272  1.0
  O  O10  2  0.5000  0.0000  0.2988  1.0
  O  O11  2  0.5000  0.0000  0.4345  1.0
  O  O12  2  0.5000  0.0000  0.5648  1.0
  O  O13  2  0.5000  0.0000  0.7006  1.0
  O  O14  2  0.5000  0.0000  0.8719  1.0
  O  O15  2  0.5000  0.0000  0.9995  1.0
]