The compound described by Tl3AsSe3 crystallizes in the trigonal R3m space group. Tl(1) is bonded in a 3-coordinate geometry to three equivalent Se(1) atoms. As(1) is bonded in a trigonal non-coplanar geometry to three equivalent Se(1) atoms. Se(1) is bonded in a distorted square co-planar geometry to three equivalent Tl(1) and one As(1) atom. is represented by the CIF file [CIF]
data_Tl3AsSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.303
_cell_length_b   6.303
_cell_length_c   6.303
_cell_angle_alpha   106.649
_cell_angle_beta   106.649
_cell_angle_gamma   106.649
_symmetry_Int_Tables_number   1
_cell_volume   210.470
_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
  Tl  Tl0  1  0.156  0.552  0.156  1.0
  Tl  Tl1  1  0.552  0.156  0.156  1.0
  Tl  Tl2  1  0.156  0.156  0.552  1.0
  As  As3  1  0.697  0.697  0.697  1.0
  Se  Se4  1  0.090  0.719  0.719  1.0
  Se  Se5  1  0.719  0.719  0.090  1.0
  Se  Se6  1  0.719  0.090  0.719  1.0
[/CIF]
.
The compound described by Tl3AsSe3 crystallizes in the trigonal R3m space group. Tl(1) is bonded in a 3-coordinate geometry to three equivalent Se(1) atoms. As(1) is bonded in a trigonal non-coplanar geometry to three equivalent Se(1) atoms. Se(1) is bonded in a distorted square co-planar geometry to three equivalent Tl(1) and one As(1) atom. is represented by the CIF file [CIF]
data_Tl3AsSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.303
_cell_length_b   6.303
_cell_length_c   6.303
_cell_angle_alpha   106.649
_cell_angle_beta   106.649
_cell_angle_gamma   106.649
_symmetry_Int_Tables_number   1
_cell_volume   210.470
_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
  Tl  Tl0  1  0.156  0.552  0.156  1.0
  Tl  Tl1  1  0.552  0.156  0.156  1.0
  Tl  Tl2  1  0.156  0.156  0.552  1.0
  As  As3  1  0.697  0.697  0.697  1.0
  Se  Se4  1  0.090  0.719  0.719  1.0
  Se  Se5  1  0.719  0.719  0.090  1.0
  Se  Se6  1  0.719  0.090  0.719  1.0
[/CIF]
.