Tm3Y is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to eight equivalent Tm(1) and four equivalent Y(1) atoms to form TmY4Tm8 cuboctahedra that share corners with four equivalent Y(1)Tm12 cuboctahedra; corners with fourteen equivalent Tm(1)Y4Tm8 cuboctahedra; edges with six equivalent Y(1)Tm12 cuboctahedra; edges with twelve equivalent Tm(1)Y4Tm8 cuboctahedra; faces with four equivalent Y(1)Tm12 cuboctahedra; and faces with sixteen Tm(1,1)Y4Tm8 cuboctahedra. In the second Tm site, Tm(1) is bonded to eight equivalent Tm(1) and four equivalent Y(1) atoms to form TmY4Tm8 cuboctahedra that share corners with four equivalent Y(1)Tm12 cuboctahedra; corners with fourteen Tm(1,1)Y4Tm8 cuboctahedra; edges with six equivalent Y(1)Tm12 cuboctahedra; edges with twelve equivalent Tm(1)Y4Tm8 cuboctahedra; faces with four equivalent Y(1)Tm12 cuboctahedra; and faces with sixteen Tm(1,1)Y4Tm8 cuboctahedra. Y(1) is bonded to twelve Tm(1,1) atoms to form YTm12 cuboctahedra that share corners with six equivalent Y(1)Tm12 cuboctahedra; corners with twelve Tm(1,1)Y4Tm8 cuboctahedra; edges with eighteen Tm(1,1)Y4Tm8 cuboctahedra; faces with eight equivalent Y(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1)Y4Tm8 cuboctahedra.
Tm3Y is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to eight equivalent Tm(1) and four equivalent Y(1) atoms to form TmY4Tm8 cuboctahedra that share corners with four equivalent Y(1)Tm12 cuboctahedra; corners with fourteen equivalent Tm(1)Y4Tm8 cuboctahedra; edges with six equivalent Y(1)Tm12 cuboctahedra; edges with twelve equivalent Tm(1)Y4Tm8 cuboctahedra; faces with four equivalent Y(1)Tm12 cuboctahedra; and faces with sixteen Tm(1,1)Y4Tm8 cuboctahedra. There are a spread of Tm(1)-Tm(1) bond distances ranging from 3.45-3.63 Å. There are two shorter (3.47 Å) and two longer (3.60 Å) Tm(1)-Y(1) bond lengths. In the second Tm site, Tm(1) is bonded to eight equivalent Tm(1) and four equivalent Y(1) atoms to form TmY4Tm8 cuboctahedra that share corners with four equivalent Y(1)Tm12 cuboctahedra; corners with fourteen Tm(1,1)Y4Tm8 cuboctahedra; edges with six equivalent Y(1)Tm12 cuboctahedra; edges with twelve equivalent Tm(1)Y4Tm8 cuboctahedra; faces with four equivalent Y(1)Tm12 cuboctahedra; and faces with sixteen Tm(1,1)Y4Tm8 cuboctahedra. There are a spread of Tm(1)-Tm(1) bond distances ranging from 3.45-3.63 Å. There are two shorter (3.47 Å) and two longer (3.60 Å) Tm(1)-Y(1) bond lengths. Y(1) is bonded to twelve Tm(1,1) atoms to form YTm12 cuboctahedra that share corners with six equivalent Y(1)Tm12 cuboctahedra; corners with twelve Tm(1,1)Y4Tm8 cuboctahedra; edges with eighteen Tm(1,1)Y4Tm8 cuboctahedra; faces with eight equivalent Y(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1)Y4Tm8 cuboctahedra.