The crystal structure described by CeAl4 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded in a 16-coordinate geometry to eight equivalent Al(1) and eight equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Ce(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted corner, edge, and face-sharing AlCe4Al8 cuboctahedra. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Al(2), and four equivalent Al(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CeAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.273
_cell_length_b   4.273
_cell_length_c   6.378
_cell_angle_alpha   109.571
_cell_angle_beta   109.571
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   102.564
_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
  Ce  Ce0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.250  0.750  0.500  1.0
  Al  Al2  1  0.750  0.250  0.500  1.0
  Al  Al3  1  0.387  0.387  0.775  1.0
  Al  Al4  1  0.613  0.613  0.225  1.0
[/CIF]
.
The crystal structure described by CeAl4 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded in a 16-coordinate geometry to eight equivalent Al(1) and eight equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Ce(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted corner, edge, and face-sharing AlCe4Al8 cuboctahedra. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Al(2), and four equivalent Al(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CeAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.273
_cell_length_b   4.273
_cell_length_c   6.378
_cell_angle_alpha   109.571
_cell_angle_beta   109.571
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   102.564
_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
  Ce  Ce0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.250  0.750  0.500  1.0
  Al  Al2  1  0.750  0.250  0.500  1.0
  Al  Al3  1  0.387  0.387  0.775  1.0
  Al  Al4  1  0.613  0.613  0.225  1.0
[/CIF]
.