The structure described by La3CuSiSe7 crystallizes in the hexagonal P6_3 space group. La(1) is bonded in a 8-coordinate geometry to one Se(3), three equivalent Se(2), and four equivalent Se(1) atoms. Cu(1) is bonded in a trigonal planar geometry to three equivalent Se(1) atoms. Si(1) is bonded in a tetrahedral geometry to one Se(3) and three equivalent Se(2) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Cu(1) atom. In the second Se site, Se(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent La(1) and one Si(1) atom. In the third Se site, Se(3) is bonded in a distorted tetrahedral geometry to three equivalent La(1) and one Si(1) atom. is represented by the CIF card [CIF]
data_La3CuSiSe7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.785
_cell_length_b   10.785
_cell_length_c   6.155
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   620.029
_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
  La  La0  1  0.229  0.873  0.737  1.0
  La  La1  1  0.645  0.771  0.737  1.0
  La  La2  1  0.127  0.355  0.737  1.0
  La  La3  1  0.771  0.127  0.237  1.0
  La  La4  1  0.355  0.229  0.237  1.0
  La  La5  1  0.873  0.645  0.237  1.0
  Cu  Cu6  1  0.000  0.000  0.696  1.0
  Cu  Cu7  1  0.000  0.000  0.196  1.0
  Si  Si8  1  0.667  0.333  0.825  1.0
  Si  Si9  1  0.333  0.667  0.325  1.0
  Se  Se10  1  0.910  0.748  0.719  1.0
  Se  Se11  1  0.163  0.910  0.219  1.0
  Se  Se12  1  0.108  0.585  0.470  1.0
  Se  Se13  1  0.333  0.667  0.956  1.0
  Se  Se14  1  0.477  0.892  0.470  1.0
  Se  Se15  1  0.892  0.415  0.970  1.0
  Se  Se16  1  0.667  0.333  0.456  1.0
  Se  Se17  1  0.837  0.090  0.719  1.0
  Se  Se18  1  0.090  0.252  0.219  1.0
  Se  Se19  1  0.252  0.163  0.719  1.0
  Se  Se20  1  0.415  0.523  0.470  1.0
  Se  Se21  1  0.585  0.477  0.970  1.0
  Se  Se22  1  0.748  0.837  0.219  1.0
  Se  Se23  1  0.523  0.108  0.970  1.0
[/CIF]
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The structure described by La3CuSiSe7 crystallizes in the hexagonal P6_3 space group. La(1) is bonded in a 8-coordinate geometry to one Se(3), three equivalent Se(2), and four equivalent Se(1) atoms. Cu(1) is bonded in a trigonal planar geometry to three equivalent Se(1) atoms. Si(1) is bonded in a tetrahedral geometry to one Se(3) and three equivalent Se(2) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Cu(1) atom. In the second Se site, Se(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent La(1) and one Si(1) atom. In the third Se site, Se(3) is bonded in a distorted tetrahedral geometry to three equivalent La(1) and one Si(1) atom. is represented by the CIF card [CIF]
data_La3CuSiSe7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.785
_cell_length_b   10.785
_cell_length_c   6.155
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   620.029
_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
  La  La0  1  0.229  0.873  0.737  1.0
  La  La1  1  0.645  0.771  0.737  1.0
  La  La2  1  0.127  0.355  0.737  1.0
  La  La3  1  0.771  0.127  0.237  1.0
  La  La4  1  0.355  0.229  0.237  1.0
  La  La5  1  0.873  0.645  0.237  1.0
  Cu  Cu6  1  0.000  0.000  0.696  1.0
  Cu  Cu7  1  0.000  0.000  0.196  1.0
  Si  Si8  1  0.667  0.333  0.825  1.0
  Si  Si9  1  0.333  0.667  0.325  1.0
  Se  Se10  1  0.910  0.748  0.719  1.0
  Se  Se11  1  0.163  0.910  0.219  1.0
  Se  Se12  1  0.108  0.585  0.470  1.0
  Se  Se13  1  0.333  0.667  0.956  1.0
  Se  Se14  1  0.477  0.892  0.470  1.0
  Se  Se15  1  0.892  0.415  0.970  1.0
  Se  Se16  1  0.667  0.333  0.456  1.0
  Se  Se17  1  0.837  0.090  0.719  1.0
  Se  Se18  1  0.090  0.252  0.219  1.0
  Se  Se19  1  0.252  0.163  0.719  1.0
  Se  Se20  1  0.415  0.523  0.470  1.0
  Se  Se21  1  0.585  0.477  0.970  1.0
  Se  Se22  1  0.748  0.837  0.219  1.0
  Se  Se23  1  0.523  0.108  0.970  1.0
[/CIF]
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