data_[Na2Ta2Ag2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ta  1.5000  1.4500  0.8200
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.1559]
_cell_length_b [9.2253]
_cell_length_c [8.7347]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.3905]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaTaAgSe4]
_chemical_formula_sum '[Na2 Ta2 Ag2 Se8]'
_cell_volume [467.9049]
_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
[
  Na  Na0  2  0.1135  0.7500  0.0830  1.0
  Ta  Ta1  2  0.3603  0.2500  0.2786  1.0
  Ag  Ag2  2  0.1402  0.7500  0.7081  1.0
  Se  Se3  4  0.1335  0.0334  0.2762  1.0
  Se  Se4  2  0.3113  0.7500  0.4700  1.0
  Se  Se5  2  0.4642  0.2500  0.0365  1.0
]