The crystal structure described by Pr2Zn17 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 18-coordinate geometry to six equivalent Zn(2) and twelve equivalent Zn(1) atoms. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to two equivalent Zn(4), six equivalent Zn(1), six equivalent Zn(2), and six equivalent Zn(3) atoms. There are four inequivalent Zn sites. In the first Zn site, Zn(4) is bonded in a 14-coordinate geometry to one Pr(2), one Zn(4), three equivalent Zn(1), three equivalent Zn(3), and six equivalent Zn(2) atoms. In the second Zn site, Zn(1) is bonded to one Pr(2), two equivalent Pr(1), one Zn(4), two equivalent Zn(1), two equivalent Zn(3), and four equivalent Zn(2) atoms to form distorted ZnPr3Zn9 cuboctahedra that share corners with five equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with two equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with three equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with five equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with two equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, and faces with ten equivalent Zn(2)Pr2Zn10 cuboctahedra. In the third Zn site, Zn(2) is bonded to one Pr(1), one Pr(2), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(4), and four equivalent Zn(1) atoms to form distorted ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, corners with twelve equivalent Zn(2)Pr2Zn10 cuboctahedra,  an edgeedge with one Zn(2)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with seven equivalent Zn(2)Pr2Zn10 cuboctahedra, and faces with ten equivalent Zn(1)Pr3Zn9 cuboctahedra. In the fourth Zn site, Zn(3) is bonded to two equivalent Pr(2), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms to form ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with four equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with six equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with six equivalent Zn(3)Pr2Zn10 cuboctahedra, and faces with eight equivalent Zn(2)Pr2Zn10 cuboctahedra. is represented by the CIF file [CIF]
data_Pr2Zn17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.962
_cell_length_b   8.962
_cell_length_c   8.766
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.993
_symmetry_Int_Tables_number   1
_cell_volume   609.807
_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  1.000  0.000  0.250  1.0
  Pr  Pr1  1  0.000  1.000  0.750  1.0
  Pr  Pr2  1  0.333  0.667  0.750  1.0
  Pr  Pr3  1  0.667  0.333  0.250  1.0
  Zn  Zn4  1  0.162  0.325  0.983  1.0
  Zn  Zn5  1  0.837  0.675  0.483  1.0
  Zn  Zn6  1  0.675  0.838  0.983  1.0
  Zn  Zn7  1  0.163  0.837  0.983  1.0
  Zn  Zn8  1  0.837  0.163  0.483  1.0
  Zn  Zn9  1  0.325  0.162  0.483  1.0
  Zn  Zn10  1  0.837  0.675  0.018  1.0
  Zn  Zn11  1  0.837  0.163  0.017  1.0
  Zn  Zn12  1  0.325  0.163  0.017  1.0
  Zn  Zn13  1  0.675  0.837  0.517  1.0
  Zn  Zn14  1  0.163  0.837  0.517  1.0
  Zn  Zn15  1  0.162  0.325  0.517  1.0
  Zn  Zn16  1  0.330  0.956  0.250  1.0
  Zn  Zn17  1  0.670  0.044  0.750  1.0
  Zn  Zn18  1  0.044  0.375  0.250  1.0
  Zn  Zn19  1  0.625  0.670  0.250  1.0
  Zn  Zn20  1  0.375  0.330  0.750  1.0
  Zn  Zn21  1  0.956  0.625  0.750  1.0
  Zn  Zn22  1  0.375  0.044  0.750  1.0
  Zn  Zn23  1  0.670  0.625  0.750  1.0
  Zn  Zn24  1  0.956  0.330  0.750  1.0
  Zn  Zn25  1  0.044  0.670  0.250  1.0
  Zn  Zn26  1  0.330  0.375  0.250  1.0
  Zn  Zn27  1  0.625  0.956  0.250  1.0
  Zn  Zn28  1  0.500  1.000  0.000  1.0
  Zn  Zn29  1  0.500  1.000  0.500  1.0
  Zn  Zn30  1  0.000  0.500  1.000  1.0
  Zn  Zn31  1  0.500  0.500  0.000  1.0
  Zn  Zn32  1  0.500  0.500  0.500  1.0
  Zn  Zn33  1  1.000  0.500  0.500  1.0
  Zn  Zn34  1  0.333  0.667  0.104  1.0
  Zn  Zn35  1  0.667  0.333  0.604  1.0
  Zn  Zn36  1  0.667  0.333  0.896  1.0
  Zn  Zn37  1  0.333  0.667  0.396  1.0
[/CIF]
.
The crystal structure described by Pr2Zn17 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 18-coordinate geometry to six equivalent Zn(2) and twelve equivalent Zn(1) atoms. In the second Pr site, Pr(2) is bonded in a 20-coordinate geometry to two equivalent Zn(4), six equivalent Zn(1), six equivalent Zn(2), and six equivalent Zn(3) atoms. There are four inequivalent Zn sites. In the first Zn site, Zn(4) is bonded in a 14-coordinate geometry to one Pr(2), one Zn(4), three equivalent Zn(1), three equivalent Zn(3), and six equivalent Zn(2) atoms. In the second Zn site, Zn(1) is bonded to one Pr(2), two equivalent Pr(1), one Zn(4), two equivalent Zn(1), two equivalent Zn(3), and four equivalent Zn(2) atoms to form distorted ZnPr3Zn9 cuboctahedra that share corners with five equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with two equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with three equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with five equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with two equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, and faces with ten equivalent Zn(2)Pr2Zn10 cuboctahedra. In the third Zn site, Zn(2) is bonded to one Pr(1), one Pr(2), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(4), and four equivalent Zn(1) atoms to form distorted ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(1)Pr3Zn9 cuboctahedra, corners with twelve equivalent Zn(2)Pr2Zn10 cuboctahedra,  an edgeedge with one Zn(2)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(3)Pr2Zn10 cuboctahedra, edges with two equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(3)Pr2Zn10 cuboctahedra, faces with seven equivalent Zn(2)Pr2Zn10 cuboctahedra, and faces with ten equivalent Zn(1)Pr3Zn9 cuboctahedra. In the fourth Zn site, Zn(3) is bonded to two equivalent Pr(2), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms to form ZnPr2Zn10 cuboctahedra that share corners with four equivalent Zn(3)Pr2Zn10 cuboctahedra, corners with eight equivalent Zn(2)Pr2Zn10 cuboctahedra, corners with ten equivalent Zn(1)Pr3Zn9 cuboctahedra, edges with four equivalent Zn(2)Pr2Zn10 cuboctahedra, edges with six equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with four equivalent Zn(1)Pr3Zn9 cuboctahedra, faces with six equivalent Zn(3)Pr2Zn10 cuboctahedra, and faces with eight equivalent Zn(2)Pr2Zn10 cuboctahedra. is represented by the CIF file [CIF]
data_Pr2Zn17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.962
_cell_length_b   8.962
_cell_length_c   8.766
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.993
_symmetry_Int_Tables_number   1
_cell_volume   609.807
_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  1.000  0.000  0.250  1.0
  Pr  Pr1  1  0.000  1.000  0.750  1.0
  Pr  Pr2  1  0.333  0.667  0.750  1.0
  Pr  Pr3  1  0.667  0.333  0.250  1.0
  Zn  Zn4  1  0.162  0.325  0.983  1.0
  Zn  Zn5  1  0.837  0.675  0.483  1.0
  Zn  Zn6  1  0.675  0.838  0.983  1.0
  Zn  Zn7  1  0.163  0.837  0.983  1.0
  Zn  Zn8  1  0.837  0.163  0.483  1.0
  Zn  Zn9  1  0.325  0.162  0.483  1.0
  Zn  Zn10  1  0.837  0.675  0.018  1.0
  Zn  Zn11  1  0.837  0.163  0.017  1.0
  Zn  Zn12  1  0.325  0.163  0.017  1.0
  Zn  Zn13  1  0.675  0.837  0.517  1.0
  Zn  Zn14  1  0.163  0.837  0.517  1.0
  Zn  Zn15  1  0.162  0.325  0.517  1.0
  Zn  Zn16  1  0.330  0.956  0.250  1.0
  Zn  Zn17  1  0.670  0.044  0.750  1.0
  Zn  Zn18  1  0.044  0.375  0.250  1.0
  Zn  Zn19  1  0.625  0.670  0.250  1.0
  Zn  Zn20  1  0.375  0.330  0.750  1.0
  Zn  Zn21  1  0.956  0.625  0.750  1.0
  Zn  Zn22  1  0.375  0.044  0.750  1.0
  Zn  Zn23  1  0.670  0.625  0.750  1.0
  Zn  Zn24  1  0.956  0.330  0.750  1.0
  Zn  Zn25  1  0.044  0.670  0.250  1.0
  Zn  Zn26  1  0.330  0.375  0.250  1.0
  Zn  Zn27  1  0.625  0.956  0.250  1.0
  Zn  Zn28  1  0.500  1.000  0.000  1.0
  Zn  Zn29  1  0.500  1.000  0.500  1.0
  Zn  Zn30  1  0.000  0.500  1.000  1.0
  Zn  Zn31  1  0.500  0.500  0.000  1.0
  Zn  Zn32  1  0.500  0.500  0.500  1.0
  Zn  Zn33  1  1.000  0.500  0.500  1.0
  Zn  Zn34  1  0.333  0.667  0.104  1.0
  Zn  Zn35  1  0.667  0.333  0.604  1.0
  Zn  Zn36  1  0.667  0.333  0.896  1.0
  Zn  Zn37  1  0.333  0.667  0.396  1.0
[/CIF]
.