Materials Data on Tm3Al by Materials Project
Tm3Al is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Tm is bonded to eight equivalent Tm and four equivalent Al atoms to form distorted TmTm8Al4 cuboctahedra that share corners with four equivalent AlTm12 cuboctahedra, corners with fourteen equivalent TmTm8Al4 cuboctahedra, edges with six equivalent AlTm12 cuboctahedra, edges with twelve equivalent TmTm8Al4 cuboctahedra, faces with four equivalent AlTm12 cuboctahedra, and faces with sixteen equivalent TmTm8Al4 cuboctahedra. There are a spread of Tm–Tm bond distances ranging from 3.23–3.49 Å. There are two shorter (3.24 Å) and two longer (3.36 Å) Tm–Al bond lengths. Al is bonded to twelve equivalent Tm atoms to form AlTm12 cuboctahedra that share corners with six equivalent AlTm12 cuboctahedra, corners with twelve equivalent TmTm8Al4 cuboctahedra, edges with eighteen equivalent TmTm8Al4 cuboctahedra, faces with eight equivalent AlTm12 cuboctahedra, and faces with twelve equivalent TmTm8Al4 cuboctahedra.