Dy3Ni8Al crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 12-coordinate geometry to nine equivalent Ni(1) and three equivalent Al(1) atoms. In the second Dy site, Dy(2) is bonded in a distorted hexagonal planar geometry to three equivalent Ni(2), three equivalent Ni(3), and twelve equivalent Ni(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Dy(2), three equivalent Dy(1), one Ni(2), one Ni(3), four equivalent Ni(1), and one Al(1) atom to form distorted NiDy5AlNi6 cuboctahedra that share corners with two equivalent Al(1)Dy6Ni6 cuboctahedra, corners with fifteen equivalent Ni(1)Dy5AlNi6 cuboctahedra, edges with eight equivalent Ni(1)Dy5AlNi6 cuboctahedra, faces with three equivalent Al(1)Dy6Ni6 cuboctahedra, and faces with eleven equivalent Ni(1)Dy5AlNi6 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent Dy(2) and six equivalent Ni(1) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to three equivalent Dy(2) and six equivalent Ni(1) atoms. Al(1) is bonded to six equivalent Dy(1) and six equivalent Ni(1) atoms to form distorted AlDy6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)Dy5AlNi6 cuboctahedra, edges with six equivalent Al(1)Dy6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)Dy5AlNi6 cuboctahedra.
Dy3Ni8Al crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 12-coordinate geometry to nine equivalent Ni(1) and three equivalent Al(1) atoms. There are six shorter (2.84 Å) and three longer (3.08 Å) Dy(1)-Ni(1) bond lengths. All Dy(1)-Al(1) bond lengths are 3.01 Å. In the second Dy site, Dy(2) is bonded in a distorted hexagonal planar geometry to three equivalent Ni(2), three equivalent Ni(3), and twelve equivalent Ni(1) atoms. All Dy(2)-Ni(2) bond lengths are 2.92 Å. All Dy(2)-Ni(3) bond lengths are 2.92 Å. All Dy(2)-Ni(1) bond lengths are 3.22 Å. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Dy(2), three equivalent Dy(1), one Ni(2), one Ni(3), four equivalent Ni(1), and one Al(1) atom to form distorted NiDy5AlNi6 cuboctahedra that share corners with two equivalent Al(1)Dy6Ni6 cuboctahedra, corners with fifteen equivalent Ni(1)Dy5AlNi6 cuboctahedra, edges with eight equivalent Ni(1)Dy5AlNi6 cuboctahedra, faces with three equivalent Al(1)Dy6Ni6 cuboctahedra, and faces with eleven equivalent Ni(1)Dy5AlNi6 cuboctahedra. The Ni(1)-Ni(2) bond length is 2.46 Å. The Ni(1)-Ni(3) bond length is 2.48 Å. There are two shorter (2.49 Å) and two longer (2.57 Å) Ni(1)-Ni(1) bond lengths. The Ni(1)-Al(1) bond length is 2.49 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent Dy(2) and six equivalent Ni(1) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to three equivalent Dy(2) and six equivalent Ni(1) atoms. Al(1) is bonded to six equivalent Dy(1) and six equivalent Ni(1) atoms to form distorted AlDy6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)Dy5AlNi6 cuboctahedra, edges with six equivalent Al(1)Dy6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)Dy5AlNi6 cuboctahedra.