Dy2FeAl3 crystallizes in the trigonal R-3m space group. Dy(1) is bonded in a 16-coordinate geometry to four equivalent Dy(1), three equivalent Fe(1), and nine equivalent Al(1) atoms. Fe(1) is bonded to six equivalent Dy(1) and six equivalent Al(1) atoms to form FeDy6Al6 cuboctahedra that share corners with six equivalent Fe(1)Dy6Al6 cuboctahedra, corners with twelve equivalent Al(1)Dy6Al4Fe2 cuboctahedra, edges with six equivalent Fe(1)Dy6Al6 cuboctahedra, and faces with eighteen equivalent Al(1)Dy6Al4Fe2 cuboctahedra. Al(1) is bonded to six equivalent Dy(1), two equivalent Fe(1), and four equivalent Al(1) atoms to form AlDy6Al4Fe2 cuboctahedra that share corners with four equivalent Fe(1)Dy6Al6 cuboctahedra, corners with fourteen equivalent Al(1)Dy6Al4Fe2 cuboctahedra, edges with six equivalent Al(1)Dy6Al4Fe2 cuboctahedra, faces with six equivalent Fe(1)Dy6Al6 cuboctahedra, and faces with twelve equivalent Al(1)Dy6Al4Fe2 cuboctahedra.
Dy2FeAl3 crystallizes in the trigonal R-3m space group. Dy(1) is bonded in a 16-coordinate geometry to four equivalent Dy(1), three equivalent Fe(1), and nine equivalent Al(1) atoms. There is one shorter (3.29 Å) and three longer (3.36 Å) Dy(1)-Dy(1) bond lengths. All Dy(1)-Fe(1) bond lengths are 3.23 Å. There are three shorter (3.15 Å) and six longer (3.21 Å) Dy(1)-Al(1) bond lengths. Fe(1) is bonded to six equivalent Dy(1) and six equivalent Al(1) atoms to form FeDy6Al6 cuboctahedra that share corners with six equivalent Fe(1)Dy6Al6 cuboctahedra, corners with twelve equivalent Al(1)Dy6Al4Fe2 cuboctahedra, edges with six equivalent Fe(1)Dy6Al6 cuboctahedra, and faces with eighteen equivalent Al(1)Dy6Al4Fe2 cuboctahedra. All Fe(1)-Al(1) bond lengths are 2.70 Å. Al(1) is bonded to six equivalent Dy(1), two equivalent Fe(1), and four equivalent Al(1) atoms to form AlDy6Al4Fe2 cuboctahedra that share corners with four equivalent Fe(1)Dy6Al6 cuboctahedra, corners with fourteen equivalent Al(1)Dy6Al4Fe2 cuboctahedra, edges with six equivalent Al(1)Dy6Al4Fe2 cuboctahedra, faces with six equivalent Fe(1)Dy6Al6 cuboctahedra, and faces with twelve equivalent Al(1)Dy6Al4Fe2 cuboctahedra. All Al(1)-Al(1) bond lengths are 2.76 Å.