Pr(FeAl)6 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded in a 20-coordinate geometry to four equivalent Fe(1), four equivalent Fe(2), four equivalent Fe(3), two equivalent Al(1), two equivalent Al(2), and four equivalent Al(3) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Pr(1), two equivalent Fe(1), two equivalent Fe(3), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted corner, edge, and face-sharing FePr2Al6Fe4 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent Pr(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted corner, edge, and face-sharing FePr2Al6Fe4 cuboctahedra. In the third Fe site, Fe(3) is bonded to two equivalent Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted corner, edge, and face-sharing FePr2Al6Fe4 cuboctahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), one Al(1), and two equivalent Al(3) atoms. In the second Al site, Al(2) is bonded in a 7-coordinate geometry to one Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Al(3) atoms. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Al(1), and two equivalent Al(2) atoms.
Pr(FeAl)6 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded in a 20-coordinate geometry to four equivalent Fe(1), four equivalent Fe(2), four equivalent Fe(3), two equivalent Al(1), two equivalent Al(2), and four equivalent Al(3) atoms. All Pr(1)-Fe(1) bond lengths are 3.32 Å. All Pr(1)-Fe(2) bond lengths are 3.33 Å. All Pr(1)-Fe(3) bond lengths are 3.25 Å. Both Pr(1)-Al(1) bond lengths are 3.05 Å. Both Pr(1)-Al(2) bond lengths are 2.97 Å. All Pr(1)-Al(3) bond lengths are 3.07 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Pr(1), two equivalent Fe(1), two equivalent Fe(3), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted corner, edge, and face-sharing FePr2Al6Fe4 cuboctahedra. Both Fe(1)-Fe(1) bond lengths are 2.49 Å. Both Fe(1)-Fe(3) bond lengths are 2.51 Å. Both Fe(1)-Al(1) bond lengths are 2.66 Å. Both Fe(1)-Al(2) bond lengths are 2.63 Å. Both Fe(1)-Al(3) bond lengths are 2.54 Å. In the second Fe site, Fe(2) is bonded to two equivalent Pr(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted corner, edge, and face-sharing FePr2Al6Fe4 cuboctahedra. Both Fe(2)-Fe(2) bond lengths are 2.49 Å. Both Fe(2)-Fe(3) bond lengths are 2.51 Å. Both Fe(2)-Al(1) bond lengths are 2.65 Å. Both Fe(2)-Al(2) bond lengths are 2.63 Å. Both Fe(2)-Al(3) bond lengths are 2.54 Å. In the third Fe site, Fe(3) is bonded to two equivalent Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted corner, edge, and face-sharing FePr2Al6Fe4 cuboctahedra. Both Fe(3)-Al(1) bond lengths are 2.62 Å. Both Fe(3)-Al(2) bond lengths are 2.65 Å. There is one shorter (2.74 Å) and one longer (2.75 Å) Fe(3)-Al(3) bond length. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), one Al(1), and two equivalent Al(3) atoms. The Al(1)-Al(1) bond length is 2.62 Å. Both Al(1)-Al(3) bond lengths are 2.79 Å. In the second Al site, Al(2) is bonded in a 7-coordinate geometry to one Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Al(3) atoms. There is one shorter (2.92 Å) and one longer (2.93 Å) Al(2)-Al(3) bond length. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Al(1), and two equivalent Al(2) atoms.