LaCu4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the tetragonal I-4m2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to four equivalent Cu(1), four equivalent Cu(6), and eight equivalent Cu(8) atoms. In the second La site, La(2) is bonded in a 14-coordinate geometry to two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), four equivalent Cu(7), and four equivalent Cu(8) atoms. In the third La site, La(3) is bonded in a 16-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), two equivalent Cu(5), two equivalent Cu(6), four equivalent Cu(1), and four equivalent Cu(8) atoms. In the fourth La site, La(4) is bonded in a 16-coordinate geometry to two equivalent Cu(1), two equivalent Cu(4), two equivalent Cu(6), two equivalent Cu(7), two equivalent Cu(8), three equivalent Cu(2), and three equivalent Cu(5) atoms. There are eight inequivalent Cu sites. In the first Cu site, Cu(5) is bonded in a 10-coordinate geometry to one La(3), three equivalent La(4), one Cu(4), two equivalent Cu(1), and three equivalent Cu(5) atoms. In the second Cu site, Cu(6) is bonded in a 9-coordinate geometry to one La(1), one La(3), two equivalent La(4), one Cu(2), two equivalent Cu(1), and two equivalent Cu(8) atoms. In the third Cu site, Cu(7) is bonded to two equivalent La(2), two equivalent La(4), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(8) atoms to form CuLa4Cu8 cuboctahedra that share corners with two equivalent Cu(3)La2Cu10 cuboctahedra, corners with two equivalent Cu(4)La4Cu8 cuboctahedra, corners with two equivalent Cu(7)La4Cu8 cuboctahedra, edges with two equivalent Cu(4)La4Cu8 cuboctahedra, faces with two equivalent Cu(4)La4Cu8 cuboctahedra, faces with four equivalent Cu(3)La2Cu10 cuboctahedra, and faces with four equivalent Cu(7)La4Cu8 cuboctahedra. In the fourth Cu site, Cu(8) is bonded in a 10-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Cu(1), one Cu(3), one Cu(4), one Cu(6), one Cu(7), and one Cu(8) atom. In the fifth Cu site, Cu(1) is bonded in a 11-coordinate geometry to one La(1), two equivalent La(3), two equivalent La(4), two equivalent Cu(5), two equivalent Cu(6), and two equivalent Cu(8) atoms. In the sixth Cu site, Cu(2) is bonded in a 10-coordinate geometry to one La(2), three equivalent La(4), one Cu(6), two equivalent Cu(7), and three equivalent Cu(2) atoms. In the seventh Cu site, Cu(3) is bonded to one La(2), one La(3), two equivalent Cu(7), two equivalent Cu(8), three equivalent Cu(3), and three equivalent Cu(4) atoms to form CuLa2Cu10 cuboctahedra that share  a cornercorner with one Cu(3)La2Cu10 cuboctahedra,  a cornercorner with one Cu(4)La4Cu8 cuboctahedra, corners with two equivalent Cu(7)La4Cu8 cuboctahedra, faces with three equivalent Cu(3)La2Cu10 cuboctahedra, faces with four equivalent Cu(4)La4Cu8 cuboctahedra, and faces with four equivalent Cu(7)La4Cu8 cuboctahedra. In the eighth Cu site, Cu(4) is bonded to one La(2), one La(3), two equivalent La(4), one Cu(5), two equivalent Cu(7), two equivalent Cu(8), and three equivalent Cu(3) atoms to form CuLa4Cu8 cuboctahedra that share  a cornercorner with one Cu(3)La2Cu10 cuboctahedra, corners with two equivalent Cu(7)La4Cu8 cuboctahedra, edges with two equivalent Cu(7)La4Cu8 cuboctahedra, faces with two equivalent Cu(7)La4Cu8 cuboctahedra, faces with four equivalent Cu(3)La2Cu10 cuboctahedra, and faces with four equivalent Cu(4)La4Cu8 cuboctahedra.
LaCu4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the tetragonal I-4m2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to four equivalent Cu(1), four equivalent Cu(6), and eight equivalent Cu(8) atoms. All La(1)-Cu(1) bond lengths are 3.08 Å. All La(1)-Cu(6) bond lengths are 2.93 Å. All La(1)-Cu(8) bond lengths are 3.43 Å. In the second La site, La(2) is bonded in a 14-coordinate geometry to two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), four equivalent Cu(7), and four equivalent Cu(8) atoms. Both La(2)-Cu(2) bond lengths are 3.04 Å. Both La(2)-Cu(3) bond lengths are 3.16 Å. Both La(2)-Cu(4) bond lengths are 3.28 Å. All La(2)-Cu(7) bond lengths are 3.23 Å. All La(2)-Cu(8) bond lengths are 3.01 Å. In the third La site, La(3) is bonded in a 16-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), two equivalent Cu(5), two equivalent Cu(6), four equivalent Cu(1), and four equivalent Cu(8) atoms. Both La(3)-Cu(3) bond lengths are 3.21 Å. Both La(3)-Cu(4) bond lengths are 3.11 Å. Both La(3)-Cu(5) bond lengths are 3.04 Å. Both La(3)-Cu(6) bond lengths are 3.17 Å. All La(3)-Cu(1) bond lengths are 3.27 Å. All La(3)-Cu(8) bond lengths are 3.05 Å. In the fourth La site, La(4) is bonded in a 16-coordinate geometry to two equivalent Cu(1), two equivalent Cu(4), two equivalent Cu(6), two equivalent Cu(7), two equivalent Cu(8), three equivalent Cu(2), and three equivalent Cu(5) atoms. Both La(4)-Cu(1) bond lengths are 3.28 Å. Both La(4)-Cu(4) bond lengths are 3.24 Å. Both La(4)-Cu(6) bond lengths are 3.09 Å. Both La(4)-Cu(7) bond lengths are 3.27 Å. Both La(4)-Cu(8) bond lengths are 2.99 Å. There are two shorter (3.09 Å) and one longer (3.25 Å) La(4)-Cu(2) bond length. There are two shorter (3.03 Å) and one longer (3.27 Å) La(4)-Cu(5) bond length. There are eight inequivalent Cu sites. In the first Cu site, Cu(5) is bonded in a 10-coordinate geometry to one La(3), three equivalent La(4), one Cu(4), two equivalent Cu(1), and three equivalent Cu(5) atoms. The Cu(5)-Cu(4) bond length is 2.60 Å. Both Cu(5)-Cu(1) bond lengths are 2.52 Å. There are two shorter (2.50 Å) and one longer (2.76 Å) Cu(5)-Cu(5) bond length. In the second Cu site, Cu(6) is bonded in a 9-coordinate geometry to one La(1), one La(3), two equivalent La(4), one Cu(2), two equivalent Cu(1), and two equivalent Cu(8) atoms. The Cu(6)-Cu(2) bond length is 2.52 Å. Both Cu(6)-Cu(1) bond lengths are 2.69 Å. Both Cu(6)-Cu(8) bond lengths are 2.46 Å. In the third Cu site, Cu(7) is bonded to two equivalent La(2), two equivalent La(4), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(8) atoms to form CuLa4Cu8 cuboctahedra that share corners with two equivalent Cu(3)La2Cu10 cuboctahedra, corners with two equivalent Cu(4)La4Cu8 cuboctahedra, corners with two equivalent Cu(7)La4Cu8 cuboctahedra, edges with two equivalent Cu(4)La4Cu8 cuboctahedra, faces with two equivalent Cu(4)La4Cu8 cuboctahedra, faces with four equivalent Cu(3)La2Cu10 cuboctahedra, and faces with four equivalent Cu(7)La4Cu8 cuboctahedra. Both Cu(7)-Cu(2) bond lengths are 2.54 Å. Both Cu(7)-Cu(3) bond lengths are 2.49 Å. Both Cu(7)-Cu(4) bond lengths are 2.65 Å. Both Cu(7)-Cu(8) bond lengths are 2.56 Å. In the fourth Cu site, Cu(8) is bonded in a 10-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Cu(1), one Cu(3), one Cu(4), one Cu(6), one Cu(7), and one Cu(8) atom. The Cu(8)-Cu(1) bond length is 2.43 Å. The Cu(8)-Cu(3) bond length is 2.41 Å. The Cu(8)-Cu(4) bond length is 2.60 Å. The Cu(8)-Cu(8) bond length is 2.87 Å. In the fifth Cu site, Cu(1) is bonded in a 11-coordinate geometry to one La(1), two equivalent La(3), two equivalent La(4), two equivalent Cu(5), two equivalent Cu(6), and two equivalent Cu(8) atoms. In the sixth Cu site, Cu(2) is bonded in a 10-coordinate geometry to one La(2), three equivalent La(4), one Cu(6), two equivalent Cu(7), and three equivalent Cu(2) atoms. There are two shorter (2.48 Å) and one longer (2.76 Å) Cu(2)-Cu(2) bond length. In the seventh Cu site, Cu(3) is bonded to one La(2), one La(3), two equivalent Cu(7), two equivalent Cu(8), three equivalent Cu(3), and three equivalent Cu(4) atoms to form CuLa2Cu10 cuboctahedra that share  a cornercorner with one Cu(3)La2Cu10 cuboctahedra,  a cornercorner with one Cu(4)La4Cu8 cuboctahedra, corners with two equivalent Cu(7)La4Cu8 cuboctahedra, faces with three equivalent Cu(3)La2Cu10 cuboctahedra, faces with four equivalent Cu(4)La4Cu8 cuboctahedra, and faces with four equivalent Cu(7)La4Cu8 cuboctahedra. There are two shorter (2.45 Å) and one longer (2.52 Å) Cu(3)-Cu(3) bond length. There is one shorter (2.53 Å) and two longer (2.59 Å) Cu(3)-Cu(4) bond lengths. In the eighth Cu site, Cu(4) is bonded to one La(2), one La(3), two equivalent La(4), one Cu(5), two equivalent Cu(7), two equivalent Cu(8), and three equivalent Cu(3) atoms to form CuLa4Cu8 cuboctahedra that share  a cornercorner with one Cu(3)La2Cu10 cuboctahedra, corners with two equivalent Cu(7)La4Cu8 cuboctahedra, edges with two equivalent Cu(7)La4Cu8 cuboctahedra, faces with two equivalent Cu(7)La4Cu8 cuboctahedra, faces with four equivalent Cu(3)La2Cu10 cuboctahedra, and faces with four equivalent Cu(4)La4Cu8 cuboctahedra.