HoPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ho(1) is bonded to twelve equivalent Pm(1) atoms to form HoPm12 cuboctahedra that share corners with six equivalent Ho(1)Pm12 cuboctahedra, corners with twelve equivalent Pm(1)Pm8Ho4 cuboctahedra, edges with eighteen equivalent Pm(1)Pm8Ho4 cuboctahedra, faces with eight equivalent Ho(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Ho4 cuboctahedra. Pm(1) is bonded to four equivalent Ho(1) and eight equivalent Pm(1) atoms to form PmPm8Ho4 cuboctahedra that share corners with four equivalent Ho(1)Pm12 cuboctahedra, corners with fourteen equivalent Pm(1)Pm8Ho4 cuboctahedra, edges with six equivalent Ho(1)Pm12 cuboctahedra, edges with twelve equivalent Pm(1)Pm8Ho4 cuboctahedra, faces with four equivalent Ho(1)Pm12 cuboctahedra, and faces with sixteen equivalent Pm(1)Pm8Ho4 cuboctahedra.
HoPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ho(1) is bonded to twelve equivalent Pm(1) atoms to form HoPm12 cuboctahedra that share corners with six equivalent Ho(1)Pm12 cuboctahedra, corners with twelve equivalent Pm(1)Pm8Ho4 cuboctahedra, edges with eighteen equivalent Pm(1)Pm8Ho4 cuboctahedra, faces with eight equivalent Ho(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Ho4 cuboctahedra. There are six shorter (3.58 Å) and six longer (3.69 Å) Ho(1)-Pm(1) bond lengths. Pm(1) is bonded to four equivalent Ho(1) and eight equivalent Pm(1) atoms to form PmPm8Ho4 cuboctahedra that share corners with four equivalent Ho(1)Pm12 cuboctahedra, corners with fourteen equivalent Pm(1)Pm8Ho4 cuboctahedra, edges with six equivalent Ho(1)Pm12 cuboctahedra, edges with twelve equivalent Pm(1)Pm8Ho4 cuboctahedra, faces with four equivalent Ho(1)Pm12 cuboctahedra, and faces with sixteen equivalent Pm(1)Pm8Ho4 cuboctahedra. There are a spread of Pm(1)-Pm(1) bond distances ranging from 3.60-3.72 Å.