Ba3Dy is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ba(1) is bonded to eight equivalent Ba(1) and four equivalent Dy(1) atoms to form distorted BaBa8Dy4 cuboctahedra that share corners with four equivalent Dy(1)Ba12 cuboctahedra, corners with fourteen equivalent Ba(1)Ba8Dy4 cuboctahedra, edges with six equivalent Dy(1)Ba12 cuboctahedra, edges with twelve equivalent Ba(1)Ba8Dy4 cuboctahedra, faces with four equivalent Dy(1)Ba12 cuboctahedra, and faces with sixteen equivalent Ba(1)Ba8Dy4 cuboctahedra. Dy(1) is bonded to twelve equivalent Ba(1) atoms to form DyBa12 cuboctahedra that share corners with six equivalent Dy(1)Ba12 cuboctahedra, corners with twelve equivalent Ba(1)Ba8Dy4 cuboctahedra, edges with eighteen equivalent Ba(1)Ba8Dy4 cuboctahedra, faces with eight equivalent Dy(1)Ba12 cuboctahedra, and faces with twelve equivalent Ba(1)Ba8Dy4 cuboctahedra.
Ba3Dy is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ba(1) is bonded to eight equivalent Ba(1) and four equivalent Dy(1) atoms to form distorted BaBa8Dy4 cuboctahedra that share corners with four equivalent Dy(1)Ba12 cuboctahedra, corners with fourteen equivalent Ba(1)Ba8Dy4 cuboctahedra, edges with six equivalent Dy(1)Ba12 cuboctahedra, edges with twelve equivalent Ba(1)Ba8Dy4 cuboctahedra, faces with four equivalent Dy(1)Ba12 cuboctahedra, and faces with sixteen equivalent Ba(1)Ba8Dy4 cuboctahedra. There are a spread of Ba(1)-Ba(1) bond distances ranging from 4.06-4.35 Å. There are two shorter (4.10 Å) and two longer (4.21 Å) Ba(1)-Dy(1) bond lengths. Dy(1) is bonded to twelve equivalent Ba(1) atoms to form DyBa12 cuboctahedra that share corners with six equivalent Dy(1)Ba12 cuboctahedra, corners with twelve equivalent Ba(1)Ba8Dy4 cuboctahedra, edges with eighteen equivalent Ba(1)Ba8Dy4 cuboctahedra, faces with eight equivalent Dy(1)Ba12 cuboctahedra, and faces with twelve equivalent Ba(1)Ba8Dy4 cuboctahedra.