Rb3Dy is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Rb(1) is bonded to eight equivalent Rb(1) and four equivalent Dy(1) atoms to form distorted RbRb8Dy4 cuboctahedra that share corners with four equivalent Dy(1)Rb12 cuboctahedra, corners with fourteen equivalent Rb(1)Rb8Dy4 cuboctahedra, edges with six equivalent Dy(1)Rb12 cuboctahedra, edges with twelve equivalent Rb(1)Rb8Dy4 cuboctahedra, faces with four equivalent Dy(1)Rb12 cuboctahedra, and faces with sixteen equivalent Rb(1)Rb8Dy4 cuboctahedra. Dy(1) is bonded to twelve equivalent Rb(1) atoms to form DyRb12 cuboctahedra that share corners with six equivalent Dy(1)Rb12 cuboctahedra, corners with twelve equivalent Rb(1)Rb8Dy4 cuboctahedra, edges with eighteen equivalent Rb(1)Rb8Dy4 cuboctahedra, faces with eight equivalent Dy(1)Rb12 cuboctahedra, and faces with twelve equivalent Rb(1)Rb8Dy4 cuboctahedra.
Rb3Dy is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Rb(1) is bonded to eight equivalent Rb(1) and four equivalent Dy(1) atoms to form distorted RbRb8Dy4 cuboctahedra that share corners with four equivalent Dy(1)Rb12 cuboctahedra, corners with fourteen equivalent Rb(1)Rb8Dy4 cuboctahedra, edges with six equivalent Dy(1)Rb12 cuboctahedra, edges with twelve equivalent Rb(1)Rb8Dy4 cuboctahedra, faces with four equivalent Dy(1)Rb12 cuboctahedra, and faces with sixteen equivalent Rb(1)Rb8Dy4 cuboctahedra. There are a spread of Rb(1)-Rb(1) bond distances ranging from 4.39-4.69 Å. There are two shorter (4.51 Å) and two longer (4.54 Å) Rb(1)-Dy(1) bond lengths. Dy(1) is bonded to twelve equivalent Rb(1) atoms to form DyRb12 cuboctahedra that share corners with six equivalent Dy(1)Rb12 cuboctahedra, corners with twelve equivalent Rb(1)Rb8Dy4 cuboctahedra, edges with eighteen equivalent Rb(1)Rb8Dy4 cuboctahedra, faces with eight equivalent Dy(1)Rb12 cuboctahedra, and faces with twelve equivalent Rb(1)Rb8Dy4 cuboctahedra.