DyCu4Al crystallizes in the hexagonal P-6m2 space group. Dy(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Al(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Dy(1), six equivalent Cu(2), and three equivalent Al(1) atoms to form CuDy3Al3Cu6 cuboctahedra that share corners with nine equivalent Al(1)Dy3Cu9 cuboctahedra, corners with twelve equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, edges with six equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, faces with two equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, faces with three equivalent Al(1)Dy3Cu9 cuboctahedra, and faces with eighteen equivalent Cu(2)Dy4Al2Cu6 cuboctahedra. In the second Cu site, Cu(2) is bonded to four equivalent Dy(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuDy4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, corners with four equivalent Al(1)Dy3Cu9 cuboctahedra, corners with sixteen equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, edges with ten equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, faces with six equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, faces with six equivalent Al(1)Dy3Cu9 cuboctahedra, and faces with ten equivalent Cu(2)Dy4Al2Cu6 cuboctahedra. Al(1) is bonded to three equivalent Dy(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted AlDy3Cu9 cuboctahedra that share corners with nine equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, corners with twelve equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, edges with six equivalent Al(1)Dy3Cu9 cuboctahedra, faces with two equivalent Al(1)Dy3Cu9 cuboctahedra, faces with three equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)Dy4Al2Cu6 cuboctahedra.
DyCu4Al crystallizes in the hexagonal P-6m2 space group. Dy(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Al(1) atoms. All Dy(1)-Cu(1) bond lengths are 2.98 Å. All Dy(1)-Cu(2) bond lengths are 3.28 Å. All Dy(1)-Al(1) bond lengths are 2.98 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Dy(1), six equivalent Cu(2), and three equivalent Al(1) atoms to form CuDy3Al3Cu6 cuboctahedra that share corners with nine equivalent Al(1)Dy3Cu9 cuboctahedra, corners with twelve equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, edges with six equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, faces with two equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, faces with three equivalent Al(1)Dy3Cu9 cuboctahedra, and faces with eighteen equivalent Cu(2)Dy4Al2Cu6 cuboctahedra. All Cu(1)-Cu(2) bond lengths are 2.51 Å. All Cu(1)-Al(1) bond lengths are 2.98 Å. In the second Cu site, Cu(2) is bonded to four equivalent Dy(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuDy4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, corners with four equivalent Al(1)Dy3Cu9 cuboctahedra, corners with sixteen equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, edges with ten equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, faces with six equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, faces with six equivalent Al(1)Dy3Cu9 cuboctahedra, and faces with ten equivalent Cu(2)Dy4Al2Cu6 cuboctahedra. There are two shorter (2.57 Å) and two longer (2.59 Å) Cu(2)-Cu(2) bond lengths. Both Cu(2)-Al(1) bond lengths are 2.52 Å. Al(1) is bonded to three equivalent Dy(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted AlDy3Cu9 cuboctahedra that share corners with nine equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, corners with twelve equivalent Cu(2)Dy4Al2Cu6 cuboctahedra, edges with six equivalent Al(1)Dy3Cu9 cuboctahedra, faces with two equivalent Al(1)Dy3Cu9 cuboctahedra, faces with three equivalent Cu(1)Dy3Al3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)Dy4Al2Cu6 cuboctahedra.