data_[K8Tb2Er2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Tb  1.1000  1.7500  0.9815
  Er  1.2400  1.7500  1.0300
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [7.3886]
_cell_length_b [3.9313]
_cell_length_c [21.0319]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [K4TbEr]
_chemical_formula_sum '[K8 Tb2 Er2]'
_cell_volume [610.9011]
_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  0.5007  1
  K  K1  2  0.5000  0.0000  0.0001  1
  K  K2  2  0.5000  0.0000  0.3293  1
  K  K3  2  0.5000  0.0000  0.6717  1
  Tb  Tb4  2  0.0000  0.0000  0.8153  1
  Er  Er5  2  0.0000  0.0000  0.1829  1
]