PrFe4Al8 crystallizes in the tetragonal I4/mmm space group. Pr(1) is bonded in a 20-coordinate geometry to eight equivalent Fe(1), four equivalent Al(2), and eight equivalent Al(1) atoms. Fe(1) is bonded to two equivalent Pr(1), two equivalent Fe(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted corner, face, and edge-sharing FePr2Al8Fe2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Pr(1), four equivalent Fe(1), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Pr(1), four equivalent Fe(1), one Al(2), and four equivalent Al(1) atoms.
PrFe4Al8 crystallizes in the tetragonal I4/mmm space group. Pr(1) is bonded in a 20-coordinate geometry to eight equivalent Fe(1), four equivalent Al(2), and eight equivalent Al(1) atoms. All Pr(1)-Fe(1) bond lengths are 3.36 Å. All Pr(1)-Al(2) bond lengths are 3.04 Å. All Pr(1)-Al(1) bond lengths are 3.20 Å. Fe(1) is bonded to two equivalent Pr(1), two equivalent Fe(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted corner, face, and edge-sharing FePr2Al8Fe2 cuboctahedra. Both Fe(1)-Fe(1) bond lengths are 2.50 Å. All Fe(1)-Al(1) bond lengths are 2.54 Å. All Fe(1)-Al(2) bond lengths are 2.67 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Pr(1), four equivalent Fe(1), two equivalent Al(1), and four equivalent Al(2) atoms. Both Al(1)-Al(1) bond lengths are 2.83 Å. There are two shorter (2.71 Å) and two longer (2.77 Å) Al(1)-Al(2) bond lengths. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Pr(1), four equivalent Fe(1), one Al(2), and four equivalent Al(1) atoms. The Al(2)-Al(2) bond length is 2.74 Å.