ErPm3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Er(1) is bonded to twelve equivalent Pm(1) atoms to form ErPm12 cuboctahedra that share corners with twelve equivalent Er(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Er4 cuboctahedra, faces with six equivalent Er(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Er4 cuboctahedra. Pm(1) is bonded to four equivalent Er(1) and eight equivalent Pm(1) atoms to form PmPm8Er4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Er4 cuboctahedra, edges with eight equivalent Er(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Er4 cuboctahedra, faces with four equivalent Er(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Er4 cuboctahedra.
ErPm3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Er(1) is bonded to twelve equivalent Pm(1) atoms to form ErPm12 cuboctahedra that share corners with twelve equivalent Er(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Er4 cuboctahedra, faces with six equivalent Er(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Er4 cuboctahedra. All Er(1)-Pm(1) bond lengths are 3.62 Å. Pm(1) is bonded to four equivalent Er(1) and eight equivalent Pm(1) atoms to form PmPm8Er4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Er4 cuboctahedra, edges with eight equivalent Er(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Er4 cuboctahedra, faces with four equivalent Er(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Er4 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.62 Å.