Ac3Yb is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Ac(1) is bonded to eight equivalent Ac(1) and four equivalent Yb(1) atoms to form AcAc8Yb4 cuboctahedra that share corners with twelve equivalent Ac(1)Ac8Yb4 cuboctahedra, edges with eight equivalent Yb(1)Ac12 cuboctahedra, edges with sixteen equivalent Ac(1)Ac8Yb4 cuboctahedra, faces with four equivalent Yb(1)Ac12 cuboctahedra, and faces with fourteen equivalent Ac(1)Ac8Yb4 cuboctahedra. Yb(1) is bonded to twelve equivalent Ac(1) atoms to form YbAc12 cuboctahedra that share corners with twelve equivalent Yb(1)Ac12 cuboctahedra, edges with twenty-four equivalent Ac(1)Ac8Yb4 cuboctahedra, faces with six equivalent Yb(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Yb4 cuboctahedra.
Ac3Yb is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Ac(1) is bonded to eight equivalent Ac(1) and four equivalent Yb(1) atoms to form AcAc8Yb4 cuboctahedra that share corners with twelve equivalent Ac(1)Ac8Yb4 cuboctahedra, edges with eight equivalent Yb(1)Ac12 cuboctahedra, edges with sixteen equivalent Ac(1)Ac8Yb4 cuboctahedra, faces with four equivalent Yb(1)Ac12 cuboctahedra, and faces with fourteen equivalent Ac(1)Ac8Yb4 cuboctahedra. All Ac(1)-Ac(1) bond lengths are 3.94 Å. All Ac(1)-Yb(1) bond lengths are 3.94 Å. Yb(1) is bonded to twelve equivalent Ac(1) atoms to form YbAc12 cuboctahedra that share corners with twelve equivalent Yb(1)Ac12 cuboctahedra, edges with twenty-four equivalent Ac(1)Ac8Yb4 cuboctahedra, faces with six equivalent Yb(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Yb4 cuboctahedra.