LiTm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Li(1) is bonded to twelve equivalent Tm(1) atoms to form LiTm12 cuboctahedra that share corners with six equivalent Li(1)Tm12 cuboctahedra, corners with twelve equivalent Tm(1)Li4Tm8 cuboctahedra, edges with eighteen equivalent Tm(1)Li4Tm8 cuboctahedra, faces with eight equivalent Li(1)Tm12 cuboctahedra, and faces with twelve equivalent Tm(1)Li4Tm8 cuboctahedra. Tm(1) is bonded to four equivalent Li(1) and eight equivalent Tm(1) atoms to form distorted TmLi4Tm8 cuboctahedra that share corners with four equivalent Li(1)Tm12 cuboctahedra, corners with fourteen equivalent Tm(1)Li4Tm8 cuboctahedra, edges with six equivalent Li(1)Tm12 cuboctahedra, edges with twelve equivalent Tm(1)Li4Tm8 cuboctahedra, faces with four equivalent Li(1)Tm12 cuboctahedra, and faces with sixteen equivalent Tm(1)Li4Tm8 cuboctahedra.
LiTm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Li(1) is bonded to twelve equivalent Tm(1) atoms to form LiTm12 cuboctahedra that share corners with six equivalent Li(1)Tm12 cuboctahedra, corners with twelve equivalent Tm(1)Li4Tm8 cuboctahedra, edges with eighteen equivalent Tm(1)Li4Tm8 cuboctahedra, faces with eight equivalent Li(1)Tm12 cuboctahedra, and faces with twelve equivalent Tm(1)Li4Tm8 cuboctahedra. There are six shorter (3.37 Å) and six longer (3.45 Å) Li(1)-Tm(1) bond lengths. Tm(1) is bonded to four equivalent Li(1) and eight equivalent Tm(1) atoms to form distorted TmLi4Tm8 cuboctahedra that share corners with four equivalent Li(1)Tm12 cuboctahedra, corners with fourteen equivalent Tm(1)Li4Tm8 cuboctahedra, edges with six equivalent Li(1)Tm12 cuboctahedra, edges with twelve equivalent Tm(1)Li4Tm8 cuboctahedra, faces with four equivalent Li(1)Tm12 cuboctahedra, and faces with sixteen equivalent Tm(1)Li4Tm8 cuboctahedra. There are a spread of Tm(1)-Tm(1) bond distances ranging from 3.39-3.48 Å.