data_[Sr2Y1Er1Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Y  1.2200  1.8000  1.0400
  Er  1.2400  1.7500  1.0300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [7.2606]
_cell_length_b [4.1979]
_cell_length_c [7.4455]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.0224]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [Sr2YErSe4]
_chemical_formula_sum '[Sr2 Y1 Er1 Se4]'
_cell_volume [214.5411]
_cell_formula_units_Z [1]
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  1  0.0000  0.5000  0.5000  1
  Sr  Sr1  1  0.5000  0.0000  0.5000  1
  Y  Y2  1  0.0000  0.0000  0.0000  1
  Er  Er3  1  0.5000  0.5000  0.0000  1
  Se  Se4  2  0.2458  0.5000  0.2299  1
  Se  Se5  2  0.2594  0.0000  0.7716  1
]