LaCu3Al2 crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to four equivalent Cu(2), six equivalent Cu(1), and eight equivalent Al(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded to four equivalent La(1), four equivalent Cu(1), and four equivalent Al(1) atoms to form distorted CuLa4Al4Cu4 cuboctahedra that share corners with eight equivalent Cu(2)La4Al4Cu4 cuboctahedra, corners with eight equivalent Al(1)La4Al2Cu6 cuboctahedra, edges with two equivalent Cu(2)La4Al4Cu4 cuboctahedra, edges with eight equivalent Al(1)La4Al2Cu6 cuboctahedra, faces with two equivalent Cu(2)La4Al4Cu4 cuboctahedra, and faces with eight equivalent Al(1)La4Al2Cu6 cuboctahedra. In the second Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent La(1), two equivalent Cu(2), and four equivalent Al(1) atoms. Al(1) is bonded to four equivalent La(1), two equivalent Cu(2), four equivalent Cu(1), and two equivalent Al(1) atoms to form distorted AlLa4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(2)La4Al4Cu4 cuboctahedra, corners with twelve equivalent Al(1)La4Al2Cu6 cuboctahedra, edges with four equivalent Cu(2)La4Al4Cu4 cuboctahedra, edges with six equivalent Al(1)La4Al2Cu6 cuboctahedra, faces with four equivalent Cu(2)La4Al4Cu4 cuboctahedra, and faces with six equivalent Al(1)La4Al2Cu6 cuboctahedra.
LaCu3Al2 crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to four equivalent Cu(2), six equivalent Cu(1), and eight equivalent Al(1) atoms. All La(1)-Cu(2) bond lengths are 3.40 Å. All La(1)-Cu(1) bond lengths are 3.05 Å. All La(1)-Al(1) bond lengths are 3.35 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded to four equivalent La(1), four equivalent Cu(1), and four equivalent Al(1) atoms to form distorted CuLa4Al4Cu4 cuboctahedra that share corners with eight equivalent Cu(2)La4Al4Cu4 cuboctahedra, corners with eight equivalent Al(1)La4Al2Cu6 cuboctahedra, edges with two equivalent Cu(2)La4Al4Cu4 cuboctahedra, edges with eight equivalent Al(1)La4Al2Cu6 cuboctahedra, faces with two equivalent Cu(2)La4Al4Cu4 cuboctahedra, and faces with eight equivalent Al(1)La4Al2Cu6 cuboctahedra. All Cu(2)-Cu(1) bond lengths are 2.54 Å. All Cu(2)-Al(1) bond lengths are 2.62 Å. In the second Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent La(1), two equivalent Cu(2), and four equivalent Al(1) atoms. All Cu(1)-Al(1) bond lengths are 2.60 Å. Al(1) is bonded to four equivalent La(1), two equivalent Cu(2), four equivalent Cu(1), and two equivalent Al(1) atoms to form distorted AlLa4Al2Cu6 cuboctahedra that share corners with four equivalent Cu(2)La4Al4Cu4 cuboctahedra, corners with twelve equivalent Al(1)La4Al2Cu6 cuboctahedra, edges with four equivalent Cu(2)La4Al4Cu4 cuboctahedra, edges with six equivalent Al(1)La4Al2Cu6 cuboctahedra, faces with four equivalent Cu(2)La4Al4Cu4 cuboctahedra, and faces with six equivalent Al(1)La4Al2Cu6 cuboctahedra. Both Al(1)-Al(1) bond lengths are 2.68 Å.