LiEu3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Li(1) is bonded to four equivalent Eu(2) and eight equivalent Eu(1) atoms to form LiEu12 cuboctahedra that share corners with four equivalent Li(1)Eu12 cuboctahedra, corners with eight equivalent Eu(2)Li4Eu8 cuboctahedra, edges with eight equivalent Li(1)Eu12 cuboctahedra, edges with sixteen equivalent Eu(1)Li4Eu8 cuboctahedra, faces with four equivalent Li(1)Eu12 cuboctahedra, faces with six equivalent Eu(2)Li4Eu8 cuboctahedra, and faces with eight equivalent Eu(1)Li4Eu8 cuboctahedra. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to four equivalent Li(1), four equivalent Eu(1), and four equivalent Eu(2) atoms to form EuLi4Eu8 cuboctahedra that share corners with twelve equivalent Eu(1)Li4Eu8 cuboctahedra, edges with eight equivalent Li(1)Eu12 cuboctahedra, edges with eight equivalent Eu(1)Li4Eu8 cuboctahedra, edges with eight equivalent Eu(2)Li4Eu8 cuboctahedra, faces with four equivalent Li(1)Eu12 cuboctahedra, faces with four equivalent Eu(2)Li4Eu8 cuboctahedra, and faces with ten equivalent Eu(1)Li4Eu8 cuboctahedra. In the second Eu site, Eu(2) is bonded to four equivalent Li(1) and eight equivalent Eu(1) atoms to form distorted EuLi4Eu8 cuboctahedra that share corners with four equivalent Eu(2)Li4Eu8 cuboctahedra, corners with eight equivalent Li(1)Eu12 cuboctahedra, edges with eight equivalent Eu(2)Li4Eu8 cuboctahedra, edges with sixteen equivalent Eu(1)Li4Eu8 cuboctahedra, faces with four equivalent Eu(2)Li4Eu8 cuboctahedra, faces with six equivalent Li(1)Eu12 cuboctahedra, and faces with eight equivalent Eu(1)Li4Eu8 cuboctahedra.
LiEu3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Li(1) is bonded to four equivalent Eu(2) and eight equivalent Eu(1) atoms to form LiEu12 cuboctahedra that share corners with four equivalent Li(1)Eu12 cuboctahedra, corners with eight equivalent Eu(2)Li4Eu8 cuboctahedra, edges with eight equivalent Li(1)Eu12 cuboctahedra, edges with sixteen equivalent Eu(1)Li4Eu8 cuboctahedra, faces with four equivalent Li(1)Eu12 cuboctahedra, faces with six equivalent Eu(2)Li4Eu8 cuboctahedra, and faces with eight equivalent Eu(1)Li4Eu8 cuboctahedra. All Li(1)-Eu(2) bond lengths are 3.68 Å. All Li(1)-Eu(1) bond lengths are 3.87 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to four equivalent Li(1), four equivalent Eu(1), and four equivalent Eu(2) atoms to form EuLi4Eu8 cuboctahedra that share corners with twelve equivalent Eu(1)Li4Eu8 cuboctahedra, edges with eight equivalent Li(1)Eu12 cuboctahedra, edges with eight equivalent Eu(1)Li4Eu8 cuboctahedra, edges with eight equivalent Eu(2)Li4Eu8 cuboctahedra, faces with four equivalent Li(1)Eu12 cuboctahedra, faces with four equivalent Eu(2)Li4Eu8 cuboctahedra, and faces with ten equivalent Eu(1)Li4Eu8 cuboctahedra. All Eu(1)-Eu(1) bond lengths are 3.68 Å. All Eu(1)-Eu(2) bond lengths are 3.87 Å. In the second Eu site, Eu(2) is bonded to four equivalent Li(1) and eight equivalent Eu(1) atoms to form distorted EuLi4Eu8 cuboctahedra that share corners with four equivalent Eu(2)Li4Eu8 cuboctahedra, corners with eight equivalent Li(1)Eu12 cuboctahedra, edges with eight equivalent Eu(2)Li4Eu8 cuboctahedra, edges with sixteen equivalent Eu(1)Li4Eu8 cuboctahedra, faces with four equivalent Eu(2)Li4Eu8 cuboctahedra, faces with six equivalent Li(1)Eu12 cuboctahedra, and faces with eight equivalent Eu(1)Li4Eu8 cuboctahedra.