DyFe2Al is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal P-3m1 space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 6-coordinate geometry to three equivalent Fe(3), three equivalent Fe(4), six equivalent Fe(5), and six equivalent Al(1) atoms. In the second Dy site, Dy(2) is bonded in a 12-coordinate geometry to three equivalent Fe(1) and nine equivalent Fe(5) atoms. In the third Dy site, Dy(3) is bonded in a 12-coordinate geometry to three equivalent Fe(2) and nine equivalent Al(1) atoms. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to six equivalent Dy(2) and six equivalent Fe(5) atoms to form FeDy6Fe6 cuboctahedra that share corners with twelve equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with six equivalent Fe(1)Dy6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(5)Dy5Fe7 cuboctahedra. In the second Fe site, Fe(2) is bonded to six equivalent Dy(3) and six equivalent Al(1) atoms to form FeDy6Al6 cuboctahedra that share corners with twelve equivalent Al(1)Dy5Al4Fe3 cuboctahedra, edges with six equivalent Fe(2)Dy6Al6 cuboctahedra, and faces with eighteen equivalent Al(1)Dy5Al4Fe3 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 9-coordinate geometry to three equivalent Dy(1), three equivalent Fe(5), and three equivalent Al(1) atoms. In the fourth Fe site, Fe(4) is bonded in a 9-coordinate geometry to three equivalent Dy(1), three equivalent Fe(5), and three equivalent Al(1) atoms. In the fifth Fe site, Fe(5) is bonded to two equivalent Dy(1), three equivalent Dy(2), one Fe(1), one Fe(3), one Fe(4), and four equivalent Fe(5) atoms to form FeDy5Fe7 cuboctahedra that share corners with two equivalent Fe(1)Dy6Fe6 cuboctahedra, corners with six equivalent Al(1)Dy5Al4Fe3 cuboctahedra, corners with nine equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with four equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with four equivalent Al(1)Dy5Al4Fe3 cuboctahedra,  a faceface with one Al(1)Dy5Al4Fe3 cuboctahedra, faces with three equivalent Fe(1)Dy6Fe6 cuboctahedra, and faces with ten equivalent Fe(5)Dy5Fe7 cuboctahedra. Al(1) is bonded to two equivalent Dy(1), three equivalent Dy(3), one Fe(2), one Fe(3), one Fe(4), and four equivalent Al(1) atoms to form distorted AlDy5Al4Fe3 cuboctahedra that share corners with two equivalent Fe(2)Dy6Al6 cuboctahedra, corners with six equivalent Fe(5)Dy5Fe7 cuboctahedra, corners with nine equivalent Al(1)Dy5Al4Fe3 cuboctahedra, edges with four equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with four equivalent Al(1)Dy5Al4Fe3 cuboctahedra,  a faceface with one Fe(5)Dy5Fe7 cuboctahedra, faces with three equivalent Fe(2)Dy6Al6 cuboctahedra, and faces with ten equivalent Al(1)Dy5Al4Fe3 cuboctahedra.
DyFe2Al is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal P-3m1 space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 6-coordinate geometry to three equivalent Fe(3), three equivalent Fe(4), six equivalent Fe(5), and six equivalent Al(1) atoms. All Dy(1)-Fe(3) bond lengths are 3.04 Å. All Dy(1)-Fe(4) bond lengths are 3.04 Å. All Dy(1)-Fe(5) bond lengths are 3.23 Å. All Dy(1)-Al(1) bond lengths are 3.33 Å. In the second Dy site, Dy(2) is bonded in a 12-coordinate geometry to three equivalent Fe(1) and nine equivalent Fe(5) atoms. All Dy(2)-Fe(1) bond lengths are 3.09 Å. There are three shorter (2.99 Å) and six longer (3.03 Å) Dy(2)-Fe(5) bond lengths. In the third Dy site, Dy(3) is bonded in a 12-coordinate geometry to three equivalent Fe(2) and nine equivalent Al(1) atoms. All Dy(3)-Fe(2) bond lengths are 3.09 Å. There are three shorter (3.11 Å) and six longer (3.12 Å) Dy(3)-Al(1) bond lengths. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to six equivalent Dy(2) and six equivalent Fe(5) atoms to form FeDy6Fe6 cuboctahedra that share corners with twelve equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with six equivalent Fe(1)Dy6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(5)Dy5Fe7 cuboctahedra. All Fe(1)-Fe(5) bond lengths are 2.53 Å. In the second Fe site, Fe(2) is bonded to six equivalent Dy(3) and six equivalent Al(1) atoms to form FeDy6Al6 cuboctahedra that share corners with twelve equivalent Al(1)Dy5Al4Fe3 cuboctahedra, edges with six equivalent Fe(2)Dy6Al6 cuboctahedra, and faces with eighteen equivalent Al(1)Dy5Al4Fe3 cuboctahedra. All Fe(2)-Al(1) bond lengths are 2.64 Å. In the third Fe site, Fe(3) is bonded in a 9-coordinate geometry to three equivalent Dy(1), three equivalent Fe(5), and three equivalent Al(1) atoms. All Fe(3)-Fe(5) bond lengths are 2.39 Å. All Fe(3)-Al(1) bond lengths are 2.57 Å. In the fourth Fe site, Fe(4) is bonded in a 9-coordinate geometry to three equivalent Dy(1), three equivalent Fe(5), and three equivalent Al(1) atoms. All Fe(4)-Fe(5) bond lengths are 2.38 Å. All Fe(4)-Al(1) bond lengths are 2.55 Å. In the fifth Fe site, Fe(5) is bonded to two equivalent Dy(1), three equivalent Dy(2), one Fe(1), one Fe(3), one Fe(4), and four equivalent Fe(5) atoms to form FeDy5Fe7 cuboctahedra that share corners with two equivalent Fe(1)Dy6Fe6 cuboctahedra, corners with six equivalent Al(1)Dy5Al4Fe3 cuboctahedra, corners with nine equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with four equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with four equivalent Al(1)Dy5Al4Fe3 cuboctahedra,  a faceface with one Al(1)Dy5Al4Fe3 cuboctahedra, faces with three equivalent Fe(1)Dy6Fe6 cuboctahedra, and faces with ten equivalent Fe(5)Dy5Fe7 cuboctahedra. There are two shorter (2.62 Å) and two longer (2.65 Å) Fe(5)-Fe(5) bond lengths. Al(1) is bonded to two equivalent Dy(1), three equivalent Dy(3), one Fe(2), one Fe(3), one Fe(4), and four equivalent Al(1) atoms to form distorted AlDy5Al4Fe3 cuboctahedra that share corners with two equivalent Fe(2)Dy6Al6 cuboctahedra, corners with six equivalent Fe(5)Dy5Fe7 cuboctahedra, corners with nine equivalent Al(1)Dy5Al4Fe3 cuboctahedra, edges with four equivalent Fe(5)Dy5Fe7 cuboctahedra, edges with four equivalent Al(1)Dy5Al4Fe3 cuboctahedra,  a faceface with one Fe(5)Dy5Fe7 cuboctahedra, faces with three equivalent Fe(2)Dy6Al6 cuboctahedra, and faces with ten equivalent Al(1)Dy5Al4Fe3 cuboctahedra. There are two shorter (2.59 Å) and two longer (2.68 Å) Al(1)-Al(1) bond lengths.