data_[K2Sr2Er2Te6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Sr  0.9500  2.0000  1.3200
  Er  1.2400  1.7500  1.0300
  Te  2.1000  1.4000  1.2933
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.9627]
_cell_length_b [4.6219]
_cell_length_c [12.7962]
_cell_angle_alpha [90.0000]
_cell_angle_beta [100.2045]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KSrErTe3]
_chemical_formula_sum '[K2 Sr2 Er2 Te6]'
_cell_volume [463.4844]
_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  0.1300  0.2500  0.1334  1
  Sr  Sr1  2  0.3681  0.2500  0.8250  1
  Er  Er2  2  0.2602  0.7500  0.4488  1
  Te  Te3  2  0.0090  0.7500  0.6238  1
  Te  Te4  2  0.2746  0.7500  0.9893  1
  Te  Te5  2  0.4687  0.2500  0.3489  1
]