Al12FeMn crystallizes in the orthorhombic Amm2 space group. Mn(1) is bonded in a distorted q6 geometry to two equivalent Al(5), four equivalent Al(2), and four equivalent Al(3) atoms. Fe(1) is bonded in a distorted q6 geometry to two equivalent Al(4), four equivalent Al(1), and four equivalent Al(3) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to two equivalent Fe(1) and four equivalent Al(3) atoms. In the second Al site, Al(2) is bonded in a 11-coordinate geometry to two equivalent Mn(1), one Al(2), four equivalent Al(3), and four equivalent Al(5) atoms. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to one Mn(1), one Fe(1), one Al(3), two equivalent Al(1), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the fourth Al site, Al(4) is bonded in a 1-coordinate geometry to one Fe(1), one Al(5), and four equivalent Al(3) atoms. In the fifth Al site, Al(5) is bonded in a 11-coordinate geometry to one Mn(1), one Al(4), one Al(5), four equivalent Al(2), and four equivalent Al(3) atoms.
Al12FeMn crystallizes in the orthorhombic Amm2 space group. Mn(1) is bonded in a distorted q6 geometry to two equivalent Al(5), four equivalent Al(2), and four equivalent Al(3) atoms. Both Mn(1)-Al(5) bond lengths are 2.41 Å. There are two shorter (2.50 Å) and two longer (2.60 Å) Mn(1)-Al(2) bond lengths. All Mn(1)-Al(3) bond lengths are 2.55 Å. Fe(1) is bonded in a distorted q6 geometry to two equivalent Al(4), four equivalent Al(1), and four equivalent Al(3) atoms. Both Fe(1)-Al(4) bond lengths are 2.40 Å. There are two shorter (2.50 Å) and two longer (2.59 Å) Fe(1)-Al(1) bond lengths. All Fe(1)-Al(3) bond lengths are 2.54 Å. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to two equivalent Fe(1) and four equivalent Al(3) atoms. There are two shorter (2.76 Å) and two longer (2.85 Å) Al(1)-Al(3) bond lengths. In the second Al site, Al(2) is bonded in a 11-coordinate geometry to two equivalent Mn(1), one Al(2), four equivalent Al(3), and four equivalent Al(5) atoms. The Al(2)-Al(2) bond length is 2.72 Å. There are two shorter (2.77 Å) and two longer (2.87 Å) Al(2)-Al(3) bond lengths. There are two shorter (2.85 Å) and two longer (2.95 Å) Al(2)-Al(5) bond lengths. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to one Mn(1), one Fe(1), one Al(3), two equivalent Al(1), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. The Al(3)-Al(3) bond length is 2.60 Å. There is one shorter (2.72 Å) and one longer (2.75 Å) Al(3)-Al(4) bond length. There is one shorter (2.73 Å) and one longer (2.75 Å) Al(3)-Al(5) bond length. In the fourth Al site, Al(4) is bonded in a 1-coordinate geometry to one Fe(1), one Al(5), and four equivalent Al(3) atoms. The Al(4)-Al(5) bond length is 2.54 Å. In the fifth Al site, Al(5) is bonded in a 11-coordinate geometry to one Mn(1), one Al(4), one Al(5), four equivalent Al(2), and four equivalent Al(3) atoms. The Al(5)-Al(5) bond length is 2.62 Å.