The compound described by EuAl3Si crystallizes in the tetragonal I4mm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Al(2), eight equivalent Al(1), and four equivalent Si(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to four equivalent Eu(1), two equivalent Al(2), and two equivalent Si(1) atoms. In the second Al site, Al(2) is bonded in a distorted single-bond geometry to four equivalent Eu(1), four equivalent Al(1), and one Si(1) atom. Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Al(2), and four equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_EuAl3Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.239
_cell_length_b   6.239
_cell_length_c   6.239
_cell_angle_alpha   139.244
_cell_angle_beta   139.244
_cell_angle_gamma   59.003
_symmetry_Int_Tables_number   1
_cell_volume   102.528
_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
  Eu  Eu0  1  0.999  0.999  0.000  1.0
  Al  Al1  1  0.752  0.252  0.500  1.0
  Al  Al2  1  0.252  0.752  0.500  1.0
  Al  Al3  1  0.615  0.615  0.000  1.0
  Si  Si4  1  0.383  0.383  0.000  1.0
[/CIF]
.
The compound described by EuAl3Si crystallizes in the tetragonal I4mm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Al(2), eight equivalent Al(1), and four equivalent Si(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to four equivalent Eu(1), two equivalent Al(2), and two equivalent Si(1) atoms. In the second Al site, Al(2) is bonded in a distorted single-bond geometry to four equivalent Eu(1), four equivalent Al(1), and one Si(1) atom. Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Al(2), and four equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_EuAl3Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.239
_cell_length_b   6.239
_cell_length_c   6.239
_cell_angle_alpha   139.244
_cell_angle_beta   139.244
_cell_angle_gamma   59.003
_symmetry_Int_Tables_number   1
_cell_volume   102.528
_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
  Eu  Eu0  1  0.999  0.999  0.000  1.0
  Al  Al1  1  0.752  0.252  0.500  1.0
  Al  Al2  1  0.252  0.752  0.500  1.0
  Al  Al3  1  0.615  0.615  0.000  1.0
  Si  Si4  1  0.383  0.383  0.000  1.0
[/CIF]
.