DyNi4Al crystallizes in the hexagonal P-6m2 space group. Dy(1) is bonded in a 18-coordinate geometry to three equivalent Ni(1), twelve equivalent Ni(2), and three equivalent Al(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to three equivalent Dy(1), six equivalent Ni(2), and three equivalent Al(1) atoms to form NiDy3Al3Ni6 cuboctahedra that share corners with nine equivalent Al(1)Dy3Ni9 cuboctahedra, corners with twelve equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, edges with six equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, faces with two equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, faces with three equivalent Al(1)Dy3Ni9 cuboctahedra, and faces with eighteen equivalent Ni(2)Dy4Al2Ni6 cuboctahedra. In the second Ni site, Ni(2) is bonded to four equivalent Dy(1), two equivalent Ni(1), four equivalent Ni(2), and two equivalent Al(1) atoms to form distorted NiDy4Al2Ni6 cuboctahedra that share corners with four equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, corners with four equivalent Al(1)Dy3Ni9 cuboctahedra, corners with sixteen equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, edges with ten equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, faces with six equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, faces with six equivalent Al(1)Dy3Ni9 cuboctahedra, and faces with ten equivalent Ni(2)Dy4Al2Ni6 cuboctahedra. Al(1) is bonded to three equivalent Dy(1), three equivalent Ni(1), and six equivalent Ni(2) atoms to form distorted AlDy3Ni9 cuboctahedra that share corners with nine equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, corners with twelve equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, edges with six equivalent Al(1)Dy3Ni9 cuboctahedra, faces with two equivalent Al(1)Dy3Ni9 cuboctahedra, faces with three equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, and faces with eighteen equivalent Ni(2)Dy4Al2Ni6 cuboctahedra.
DyNi4Al crystallizes in the hexagonal P-6m2 space group. Dy(1) is bonded in a 18-coordinate geometry to three equivalent Ni(1), twelve equivalent Ni(2), and three equivalent Al(1) atoms. All Dy(1)-Ni(1) bond lengths are 2.90 Å. All Dy(1)-Ni(2) bond lengths are 3.17 Å. All Dy(1)-Al(1) bond lengths are 2.90 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to three equivalent Dy(1), six equivalent Ni(2), and three equivalent Al(1) atoms to form NiDy3Al3Ni6 cuboctahedra that share corners with nine equivalent Al(1)Dy3Ni9 cuboctahedra, corners with twelve equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, edges with six equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, faces with two equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, faces with three equivalent Al(1)Dy3Ni9 cuboctahedra, and faces with eighteen equivalent Ni(2)Dy4Al2Ni6 cuboctahedra. All Ni(1)-Ni(2) bond lengths are 2.40 Å. All Ni(1)-Al(1) bond lengths are 2.90 Å. In the second Ni site, Ni(2) is bonded to four equivalent Dy(1), two equivalent Ni(1), four equivalent Ni(2), and two equivalent Al(1) atoms to form distorted NiDy4Al2Ni6 cuboctahedra that share corners with four equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, corners with four equivalent Al(1)Dy3Ni9 cuboctahedra, corners with sixteen equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, edges with ten equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, faces with six equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, faces with six equivalent Al(1)Dy3Ni9 cuboctahedra, and faces with ten equivalent Ni(2)Dy4Al2Ni6 cuboctahedra. There are two shorter (2.48 Å) and two longer (2.55 Å) Ni(2)-Ni(2) bond lengths. Both Ni(2)-Al(1) bond lengths are 2.43 Å. Al(1) is bonded to three equivalent Dy(1), three equivalent Ni(1), and six equivalent Ni(2) atoms to form distorted AlDy3Ni9 cuboctahedra that share corners with nine equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, corners with twelve equivalent Ni(2)Dy4Al2Ni6 cuboctahedra, edges with six equivalent Al(1)Dy3Ni9 cuboctahedra, faces with two equivalent Al(1)Dy3Ni9 cuboctahedra, faces with three equivalent Ni(1)Dy3Al3Ni6 cuboctahedra, and faces with eighteen equivalent Ni(2)Dy4Al2Ni6 cuboctahedra.