Ho3Pm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to eight equivalent Ho(1) and four equivalent Pm(1) atoms to form HoPm4Ho8 cuboctahedra that share corners with four equivalent Pm(1)Ho12 cuboctahedra; corners with fourteen Ho(1,1)Pm4Ho8 cuboctahedra; edges with six equivalent Pm(1)Ho12 cuboctahedra; edges with twelve equivalent Ho(1)Pm4Ho8 cuboctahedra; faces with four equivalent Pm(1)Ho12 cuboctahedra; and faces with sixteen Ho(1,1)Pm4Ho8 cuboctahedra. In the second Ho site, Ho(1) is bonded to eight Ho(1,1) and four equivalent Pm(1) atoms to form HoPm4Ho8 cuboctahedra that share corners with four equivalent Pm(1)Ho12 cuboctahedra; corners with fourteen Ho(1,1)Pm4Ho8 cuboctahedra; edges with six equivalent Pm(1)Ho12 cuboctahedra; edges with twelve Ho(1,1)Pm4Ho8 cuboctahedra; faces with four equivalent Pm(1)Ho12 cuboctahedra; and faces with sixteen Ho(1,1)Pm4Ho8 cuboctahedra. Pm(1) is bonded to twelve Ho(1,1) atoms to form PmHo12 cuboctahedra that share corners with six equivalent Pm(1)Ho12 cuboctahedra; corners with twelve Ho(1,1)Pm4Ho8 cuboctahedra; edges with eighteen Ho(1,1)Pm4Ho8 cuboctahedra; faces with eight equivalent Pm(1)Ho12 cuboctahedra; and faces with twelve Ho(1,1)Pm4Ho8 cuboctahedra.
Ho3Pm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to eight equivalent Ho(1) and four equivalent Pm(1) atoms to form HoPm4Ho8 cuboctahedra that share corners with four equivalent Pm(1)Ho12 cuboctahedra; corners with fourteen Ho(1,1)Pm4Ho8 cuboctahedra; edges with six equivalent Pm(1)Ho12 cuboctahedra; edges with twelve equivalent Ho(1)Pm4Ho8 cuboctahedra; faces with four equivalent Pm(1)Ho12 cuboctahedra; and faces with sixteen Ho(1,1)Pm4Ho8 cuboctahedra. There are a spread of Ho(1)-Ho(1) bond distances ranging from 3.50-3.68 Å. There are two shorter (3.52 Å) and two longer (3.65 Å) Ho(1)-Pm(1) bond lengths. In the second Ho site, Ho(1) is bonded to eight Ho(1,1) and four equivalent Pm(1) atoms to form HoPm4Ho8 cuboctahedra that share corners with four equivalent Pm(1)Ho12 cuboctahedra; corners with fourteen Ho(1,1)Pm4Ho8 cuboctahedra; edges with six equivalent Pm(1)Ho12 cuboctahedra; edges with twelve Ho(1,1)Pm4Ho8 cuboctahedra; faces with four equivalent Pm(1)Ho12 cuboctahedra; and faces with sixteen Ho(1,1)Pm4Ho8 cuboctahedra. There are a spread of Ho(1)-Ho(1) bond distances ranging from 3.50-3.68 Å. There are two shorter (3.52 Å) and two longer (3.65 Å) Ho(1)-Pm(1) bond lengths. Pm(1) is bonded to twelve Ho(1,1) atoms to form PmHo12 cuboctahedra that share corners with six equivalent Pm(1)Ho12 cuboctahedra; corners with twelve Ho(1,1)Pm4Ho8 cuboctahedra; edges with eighteen Ho(1,1)Pm4Ho8 cuboctahedra; faces with eight equivalent Pm(1)Ho12 cuboctahedra; and faces with twelve Ho(1,1)Pm4Ho8 cuboctahedra.