Cu13Ba crystallizes in the cubic Fm-3c space group. Ba(1) is bonded in a 24-coordinate geometry to twenty-four equivalent Cu(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to twelve equivalent Cu(2) atoms to form a mixture of corner and face-sharing CuCu12 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Ba(1), one Cu(1), and nine equivalent Cu(2) atoms to form distorted CuBa2Cu10 cuboctahedra that share  a cornercorner with one Cu(1)Cu12 cuboctahedra, corners with twenty-seven equivalent Cu(2)Ba2Cu10 cuboctahedra, edges with eight equivalent Cu(2)Ba2Cu10 cuboctahedra, faces with two equivalent Cu(1)Cu12 cuboctahedra, and faces with twenty-three equivalent Cu(2)Ba2Cu10 cuboctahedra.
Cu13Ba crystallizes in the cubic Fm-3c space group. Ba(1) is bonded in a 24-coordinate geometry to twenty-four equivalent Cu(2) atoms. All Ba(1)-Cu(2) bond lengths are 3.40 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to twelve equivalent Cu(2) atoms to form a mixture of corner and face-sharing CuCu12 cuboctahedra. All Cu(1)-Cu(2) bond lengths are 2.47 Å. In the second Cu site, Cu(2) is bonded to two equivalent Ba(1), one Cu(1), and nine equivalent Cu(2) atoms to form distorted CuBa2Cu10 cuboctahedra that share  a cornercorner with one Cu(1)Cu12 cuboctahedra, corners with twenty-seven equivalent Cu(2)Ba2Cu10 cuboctahedra, edges with eight equivalent Cu(2)Ba2Cu10 cuboctahedra, faces with two equivalent Cu(1)Cu12 cuboctahedra, and faces with twenty-three equivalent Cu(2)Ba2Cu10 cuboctahedra. There are a spread of Cu(2)-Cu(2) bond distances ranging from 2.49-2.66 Å.