The structure described by Pr3Ni8Al crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 12-coordinate geometry to nine equivalent Ni(1) and three equivalent Al(1) atoms. In the second Pr site, Pr(2) is bonded in a 6-coordinate geometry to three equivalent Ni(2), three equivalent Ni(3), and twelve equivalent Ni(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Pr(2), three equivalent Pr(1), one Ni(2), one Ni(3), four equivalent Ni(1), and one Al(1) atom to form distorted NiPr5AlNi6 cuboctahedra that share corners with two equivalent Al(1)Pr6Ni6 cuboctahedra, corners with fifteen equivalent Ni(1)Pr5AlNi6 cuboctahedra, edges with eight equivalent Ni(1)Pr5AlNi6 cuboctahedra, faces with three equivalent Al(1)Pr6Ni6 cuboctahedra, and faces with eleven equivalent Ni(1)Pr5AlNi6 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent Pr(2) and six equivalent Ni(1) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to three equivalent Pr(2) and six equivalent Ni(1) atoms. Al(1) is bonded to six equivalent Pr(1) and six equivalent Ni(1) atoms to form AlPr6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)Pr5AlNi6 cuboctahedra, edges with six equivalent Al(1)Pr6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)Pr5AlNi6 cuboctahedra. is represented by the CIF file [CIF]
data_Pr3AlNi8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.162
_cell_length_b   5.162
_cell_length_c   16.248
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   375.007
_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
  Pr  Pr0  1  0.333  0.667  0.954  1.0
  Pr  Pr1  1  0.667  0.333  0.046  1.0
  Pr  Pr2  1  0.667  0.333  0.454  1.0
  Pr  Pr3  1  0.333  0.667  0.546  1.0
  Pr  Pr4  1  0.333  0.667  0.750  1.0
  Pr  Pr5  1  0.667  0.333  0.250  1.0
  Al  Al6  1  0.000  0.000  0.500  1.0
  Al  Al7  1  0.000  0.000  0.000  1.0
  Ni  Ni8  1  0.168  0.832  0.373  1.0
  Ni  Ni9  1  0.168  0.336  0.373  1.0
  Ni  Ni10  1  0.664  0.832  0.373  1.0
  Ni  Ni11  1  0.832  0.168  0.627  1.0
  Ni  Ni12  1  0.832  0.664  0.627  1.0
  Ni  Ni13  1  0.336  0.168  0.627  1.0
  Ni  Ni14  1  0.832  0.168  0.873  1.0
  Ni  Ni15  1  0.832  0.664  0.873  1.0
  Ni  Ni16  1  0.336  0.168  0.873  1.0
  Ni  Ni17  1  0.168  0.832  0.127  1.0
  Ni  Ni18  1  0.168  0.336  0.127  1.0
  Ni  Ni19  1  0.664  0.832  0.127  1.0
  Ni  Ni20  1  0.333  0.667  0.250  1.0
  Ni  Ni21  1  0.667  0.333  0.750  1.0
  Ni  Ni22  1  0.000  0.000  0.250  1.0
  Ni  Ni23  1  0.000  0.000  0.750  1.0
[/CIF]
.
The structure described by Pr3Ni8Al crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 12-coordinate geometry to nine equivalent Ni(1) and three equivalent Al(1) atoms. In the second Pr site, Pr(2) is bonded in a 6-coordinate geometry to three equivalent Ni(2), three equivalent Ni(3), and twelve equivalent Ni(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Pr(2), three equivalent Pr(1), one Ni(2), one Ni(3), four equivalent Ni(1), and one Al(1) atom to form distorted NiPr5AlNi6 cuboctahedra that share corners with two equivalent Al(1)Pr6Ni6 cuboctahedra, corners with fifteen equivalent Ni(1)Pr5AlNi6 cuboctahedra, edges with eight equivalent Ni(1)Pr5AlNi6 cuboctahedra, faces with three equivalent Al(1)Pr6Ni6 cuboctahedra, and faces with eleven equivalent Ni(1)Pr5AlNi6 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent Pr(2) and six equivalent Ni(1) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to three equivalent Pr(2) and six equivalent Ni(1) atoms. Al(1) is bonded to six equivalent Pr(1) and six equivalent Ni(1) atoms to form AlPr6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)Pr5AlNi6 cuboctahedra, edges with six equivalent Al(1)Pr6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)Pr5AlNi6 cuboctahedra. is represented by the CIF file [CIF]
data_Pr3AlNi8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.162
_cell_length_b   5.162
_cell_length_c   16.248
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   375.007
_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
  Pr  Pr0  1  0.333  0.667  0.954  1.0
  Pr  Pr1  1  0.667  0.333  0.046  1.0
  Pr  Pr2  1  0.667  0.333  0.454  1.0
  Pr  Pr3  1  0.333  0.667  0.546  1.0
  Pr  Pr4  1  0.333  0.667  0.750  1.0
  Pr  Pr5  1  0.667  0.333  0.250  1.0
  Al  Al6  1  0.000  0.000  0.500  1.0
  Al  Al7  1  0.000  0.000  0.000  1.0
  Ni  Ni8  1  0.168  0.832  0.373  1.0
  Ni  Ni9  1  0.168  0.336  0.373  1.0
  Ni  Ni10  1  0.664  0.832  0.373  1.0
  Ni  Ni11  1  0.832  0.168  0.627  1.0
  Ni  Ni12  1  0.832  0.664  0.627  1.0
  Ni  Ni13  1  0.336  0.168  0.627  1.0
  Ni  Ni14  1  0.832  0.168  0.873  1.0
  Ni  Ni15  1  0.832  0.664  0.873  1.0
  Ni  Ni16  1  0.336  0.168  0.873  1.0
  Ni  Ni17  1  0.168  0.832  0.127  1.0
  Ni  Ni18  1  0.168  0.336  0.127  1.0
  Ni  Ni19  1  0.664  0.832  0.127  1.0
  Ni  Ni20  1  0.333  0.667  0.250  1.0
  Ni  Ni21  1  0.667  0.333  0.750  1.0
  Ni  Ni22  1  0.000  0.000  0.250  1.0
  Ni  Ni23  1  0.000  0.000  0.750  1.0
[/CIF]
.