The structure described by PrAl4 crystallizes in the tetragonal I4/mmm space group. Pr(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 in a 9-coordinate geometry to four equivalent Pr(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Pr(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted face, edge, and corner-sharing AlPr4Al8 cuboctahedra. is represented by the CIF file [CIF]
data_PrAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.267
_cell_length_b   4.267
_cell_length_c   6.431
_cell_angle_alpha   109.373
_cell_angle_beta   109.373
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   103.403
_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
  Pr  Pr0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.612  0.612  0.224  1.0
  Al  Al2  1  0.250  0.750  0.500  1.0
  Al  Al3  1  0.750  0.250  0.500  1.0
  Al  Al4  1  0.388  0.388  0.776  1.0
[/CIF]
.
The structure described by PrAl4 crystallizes in the tetragonal I4/mmm space group. Pr(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 in a 9-coordinate geometry to four equivalent Pr(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Pr(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted face, edge, and corner-sharing AlPr4Al8 cuboctahedra. is represented by the CIF file [CIF]
data_PrAl4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.267
_cell_length_b   4.267
_cell_length_c   6.431
_cell_angle_alpha   109.373
_cell_angle_beta   109.373
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   103.403
_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
  Pr  Pr0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.612  0.612  0.224  1.0
  Al  Al2  1  0.250  0.750  0.500  1.0
  Al  Al3  1  0.750  0.250  0.500  1.0
  Al  Al4  1  0.388  0.388  0.776  1.0
[/CIF]
.