PrFe2Al8 crystallizes in the orthorhombic Pbam space group. Pr(1) is bonded in a 13-coordinate geometry to one Al(1), two equivalent Al(3), two equivalent Al(4), two equivalent Al(5), two equivalent Al(7), two equivalent Al(8), and two equivalent Al(9) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 9-coordinate geometry to one Al(1), one Al(6), one Al(7), two equivalent Al(3), two equivalent Al(8), and two equivalent Al(9) atoms. In the second Fe site, Fe(2) is bonded in a 9-coordinate geometry to one Al(7), two equivalent Al(2), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(6) atoms. There are nine inequivalent Al sites. In the first Al site, Al(9) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), one Al(3), one Al(4), two equivalent Al(1), two equivalent Al(7), and two equivalent Al(8) atoms. In the second Al site, Al(1) is bonded in a distorted linear geometry to two equivalent Pr(1), two equivalent Fe(1), four equivalent Al(8), and four equivalent Al(9) atoms. In the third Al site, Al(2) is bonded in a 4-coordinate geometry to four equivalent Fe(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the fourth Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), one Al(4), one Al(8), and one Al(9) atom. In the fifth Al site, Al(4) is bonded in a 10-coordinate geometry to two equivalent Pr(1), two equivalent Fe(2), one Al(2), one Al(3), one Al(5), one Al(9), and two equivalent Al(7) atoms. In the sixth Al site, Al(5) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Fe(2), one Al(2), one Al(4), one Al(8), and two equivalent Al(7) atoms. In the seventh Al site, Al(6) is bonded in a 3-coordinate geometry to one Fe(1), two equivalent Fe(2), and two equivalent Al(8) atoms. In the eighth Al site, Al(7) is bonded in a distorted linear geometry to two equivalent Pr(1), one Fe(1), one Fe(2), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(9) atoms. In the ninth Al site, Al(8) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), one Al(3), one Al(5), two equivalent Al(1), two equivalent Al(6), and two equivalent Al(9) atoms.
PrFe2Al8 crystallizes in the orthorhombic Pbam space group. Pr(1) is bonded in a 13-coordinate geometry to one Al(1), two equivalent Al(3), two equivalent Al(4), two equivalent Al(5), two equivalent Al(7), two equivalent Al(8), and two equivalent Al(9) atoms. The Pr(1)-Al(1) bond length is 3.26 Å. Both Pr(1)-Al(3) bond lengths are 3.20 Å. Both Pr(1)-Al(4) bond lengths are 3.16 Å. Both Pr(1)-Al(5) bond lengths are 3.17 Å. There is one shorter (3.21 Å) and one longer (3.32 Å) Pr(1)-Al(7) bond length. Both Pr(1)-Al(8) bond lengths are 3.22 Å. Both Pr(1)-Al(9) bond lengths are 3.16 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 9-coordinate geometry to one Al(1), one Al(6), one Al(7), two equivalent Al(3), two equivalent Al(8), and two equivalent Al(9) atoms. The Fe(1)-Al(1) bond length is 2.32 Å. The Fe(1)-Al(6) bond length is 2.41 Å. The Fe(1)-Al(7) bond length is 2.33 Å. Both Fe(1)-Al(3) bond lengths are 2.51 Å. Both Fe(1)-Al(8) bond lengths are 2.52 Å. Both Fe(1)-Al(9) bond lengths are 2.57 Å. In the second Fe site, Fe(2) is bonded in a 9-coordinate geometry to one Al(7), two equivalent Al(2), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(6) atoms. The Fe(2)-Al(7) bond length is 2.39 Å. Both Fe(2)-Al(2) bond lengths are 2.40 Å. Both Fe(2)-Al(4) bond lengths are 2.60 Å. Both Fe(2)-Al(5) bond lengths are 2.61 Å. Both Fe(2)-Al(6) bond lengths are 2.55 Å. There are nine inequivalent Al sites. In the first Al site, Al(9) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), one Al(3), one Al(4), two equivalent Al(1), two equivalent Al(7), and two equivalent Al(8) atoms. The Al(9)-Al(3) bond length is 2.63 Å. The Al(9)-Al(4) bond length is 2.85 Å. Both Al(9)-Al(1) bond lengths are 2.79 Å. Both Al(9)-Al(7) bond lengths are 2.80 Å. There is one shorter (2.64 Å) and one longer (3.02 Å) Al(9)-Al(8) bond length. In the second Al site, Al(1) is bonded in a distorted linear geometry to two equivalent Pr(1), two equivalent Fe(1), four equivalent Al(8), and four equivalent Al(9) atoms. All Al(1)-Al(8) bond lengths are 2.90 Å. In the third Al site, Al(2) is bonded in a 4-coordinate geometry to four equivalent Fe(2), two equivalent Al(4), and two equivalent Al(5) atoms. Both Al(2)-Al(4) bond lengths are 2.62 Å. Both Al(2)-Al(5) bond lengths are 2.61 Å. In the fourth Al site, Al(3) is bonded in a 2-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), one Al(4), one Al(8), and one Al(9) atom. The Al(3)-Al(4) bond length is 2.74 Å. The Al(3)-Al(8) bond length is 2.67 Å. In the fifth Al site, Al(4) is bonded in a 10-coordinate geometry to two equivalent Pr(1), two equivalent Fe(2), one Al(2), one Al(3), one Al(5), one Al(9), and two equivalent Al(7) atoms. The Al(4)-Al(5) bond length is 2.69 Å. Both Al(4)-Al(7) bond lengths are 2.84 Å. In the sixth Al site, Al(5) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Fe(2), one Al(2), one Al(4), one Al(8), and two equivalent Al(7) atoms. The Al(5)-Al(8) bond length is 2.71 Å. Both Al(5)-Al(7) bond lengths are 2.82 Å. In the seventh Al site, Al(6) is bonded in a 3-coordinate geometry to one Fe(1), two equivalent Fe(2), and two equivalent Al(8) atoms. Both Al(6)-Al(8) bond lengths are 2.98 Å. In the eighth Al site, Al(7) is bonded in a distorted linear geometry to two equivalent Pr(1), one Fe(1), one Fe(2), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(9) atoms. In the ninth Al site, Al(8) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), one Al(3), one Al(5), two equivalent Al(1), two equivalent Al(6), and two equivalent Al(9) atoms.