The structure described by ErAlSi crystallizes in the tetragonal I4_1md space group. Er(1) is bonded to six equivalent Al(1) and six equivalent Si(1) atoms to form a mixture of face and edge-sharing ErAl6Si6 cuboctahedra. Al(1) is bonded in a distorted trigonal planar geometry to six equivalent Er(1) and three equivalent Si(1) atoms. Si(1) is bonded in a distorted trigonal planar geometry to six equivalent Er(1) and three equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_ErAlSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.078
_cell_length_b   4.078
_cell_length_c   7.788
_cell_angle_alpha   74.820
_cell_angle_beta   74.820
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   120.329
_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
  Er  Er0  1  0.876  0.626  0.247  1.0
  Er  Er1  1  0.126  0.376  0.747  1.0
  Al  Al2  1  0.542  0.792  0.916  1.0
  Al  Al3  1  0.292  0.042  0.416  1.0
  Si  Si4  1  0.457  0.207  0.086  1.0
  Si  Si5  1  0.707  0.957  0.586  1.0
[/CIF]
.
The structure described by ErAlSi crystallizes in the tetragonal I4_1md space group. Er(1) is bonded to six equivalent Al(1) and six equivalent Si(1) atoms to form a mixture of face and edge-sharing ErAl6Si6 cuboctahedra. Al(1) is bonded in a distorted trigonal planar geometry to six equivalent Er(1) and three equivalent Si(1) atoms. Si(1) is bonded in a distorted trigonal planar geometry to six equivalent Er(1) and three equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_ErAlSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.078
_cell_length_b   4.078
_cell_length_c   7.788
_cell_angle_alpha   74.820
_cell_angle_beta   74.820
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   120.329
_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
  Er  Er0  1  0.876  0.626  0.247  1.0
  Er  Er1  1  0.126  0.376  0.747  1.0
  Al  Al2  1  0.542  0.792  0.916  1.0
  Al  Al3  1  0.292  0.042  0.416  1.0
  Si  Si4  1  0.457  0.207  0.086  1.0
  Si  Si5  1  0.707  0.957  0.586  1.0
[/CIF]
.