Pm3Y is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Pm(1) is bonded to eight equivalent Pm(1) and four equivalent Y(1) atoms to form PmPm8Y4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Y4 cuboctahedra, edges with eight equivalent Y(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Y4 cuboctahedra, faces with four equivalent Y(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Y4 cuboctahedra. Y(1) is bonded to twelve equivalent Pm(1) atoms to form YPm12 cuboctahedra that share corners with twelve equivalent Y(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Y4 cuboctahedra, faces with six equivalent Y(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Y4 cuboctahedra.
Pm3Y is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Pm(1) is bonded to eight equivalent Pm(1) and four equivalent Y(1) atoms to form PmPm8Y4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Y4 cuboctahedra, edges with eight equivalent Y(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Y4 cuboctahedra, faces with four equivalent Y(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Y4 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.64 Å. All Pm(1)-Y(1) bond lengths are 3.64 Å. Y(1) is bonded to twelve equivalent Pm(1) atoms to form YPm12 cuboctahedra that share corners with twelve equivalent Y(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Y4 cuboctahedra, faces with six equivalent Y(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Y4 cuboctahedra.