Cu3Sn is beta-derived structured and crystallizes in the orthorhombic Cmcm space group. There are twelve inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two Cu(6,6); two equivalent Cu(7); four equivalent Cu(10); two equivalent Sn(1); and two equivalent Sn(5) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(4)Cu12 cuboctahedra; corners with four Cu(6,6)Cu8Sn4 cuboctahedra; corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra; corners with four equivalent Sn(5)Cu12 cuboctahedra;  an edgeedge with one Cu(2)Cu8Sn4 cuboctahedra;  an edgeedge with one Sn(1)Cu12 cuboctahedra; edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra; edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra; edges with four equivalent Cu(4)Cu8Sn4 cuboctahedra; edges with six Cu(6,6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra; faces with two Cu(6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra; faces with two equivalent Sn(1)Cu12 cuboctahedra; faces with two equivalent Sn(2)Cu12 cuboctahedra; faces with two equivalent Sn(5)Cu12 cuboctahedra; faces with four equivalent Cu(10)Cu8Sn4 cuboctahedra; and faces with four equivalent Cu(5)Cu8Sn4 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Cu(7), two equivalent Cu(8), four equivalent Cu(9), two equivalent Sn(2), and two equivalent Sn(4) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(4)Cu12 cuboctahedra,  an edgeedge with one Cu(1)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with five equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(8)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with two equivalent Sn(3)Cu12 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Cu(4)Cu8Sn4 cuboctahedra, and faces with four equivalent Cu(9)Cu8Sn4 cuboctahedra. In the third Cu site, Cu(3) is bonded to two equivalent Cu(9), six equivalent Cu(8), and four equivalent Sn(3) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(3)Cu12 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra, edges with five equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Sn(3)Cu12 cuboctahedra, faces with six equivalent Cu(3)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra. In the fourth Cu site, Cu(4) is bonded to two equivalent Cu(10), two equivalent Cu(9), four equivalent Cu(7), two equivalent Sn(2), and two equivalent Sn(4) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(2)Cu12 cuboctahedra,  an edgeedge with one Cu(3)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(5)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(1)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(8)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with two equivalent Sn(5)Cu12 cuboctahedra, faces with four equivalent Cu(2)Cu8Sn4 cuboctahedra, and faces with four equivalent Cu(7)Cu8Sn4 cuboctahedra. In the fifth Cu site, Cu(5) is bonded to two equivalent Cu(10), six equivalent Cu(6), two equivalent Sn(1), and two equivalent Sn(5) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(6)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(1)Cu12 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(5)Cu12 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with four equivalent Sn(1)Cu12 cuboctahedra, edges with six equivalent Cu(6)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(1)Cu12 cuboctahedra, faces with two equivalent Sn(5)Cu12 cuboctahedra, faces with four equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with four equivalent Cu(5)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(6)Cu8Sn4 cuboctahedra. In the sixth Cu site, Cu(6) is bonded to one Cu(1), three equivalent Cu(5), four equivalent Cu(6), one Sn(5), and three equivalent Sn(1) atoms to form CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(1)Cu12 cuboctahedra; corners with two equivalent Sn(5)Cu12 cuboctahedra; corners with six Cu(6,6)Cu8Sn4 cuboctahedra;  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(1)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra; edges with three equivalent Sn(1)Cu12 cuboctahedra; edges with three equivalent Sn(5)Cu12 cuboctahedra; edges with five equivalent Cu(10)Cu8Sn4 cuboctahedra;  a faceface with one Cu(1)Cu8Sn4 cuboctahedra;  a faceface with one Sn(5)Cu12 cuboctahedra; faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra; faces with three equivalent Cu(5)Cu8Sn4 cuboctahedra; faces with three equivalent Sn(1)Cu12 cuboctahedra; and faces with ten Cu(6,6,6)Cu8Sn4 cuboctahedra. In the seventh Cu site, Cu(6) is bonded to one Cu(1), three equivalent Cu(5), four equivalent Cu(6), one Sn(5), and three equivalent Sn(1) atoms to form CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with six equivalent Cu(6)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(1)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with three equivalent Sn(1)Cu12 cuboctahedra, edges with three equivalent Sn(5)Cu12 cuboctahedra, edges with five equivalent Cu(10)Cu8Sn4 cuboctahedra,  a faceface with one Cu(1)Cu8Sn4 cuboctahedra,  a faceface with one Sn(5)Cu12 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with three equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with three equivalent Sn(1)Cu12 cuboctahedra, and faces with ten equivalent Cu(6)Cu8Sn4 cuboctahedra. In the eighth Cu site, Cu(6) is bonded to one Cu(1), three equivalent Cu(5), four equivalent Cu(6), one Sn(5), and three equivalent Sn(1) atoms to form CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(1)Cu12 cuboctahedra; corners with two equivalent Sn(5)Cu12 cuboctahedra; corners with six Cu(6,6)Cu8Sn4 cuboctahedra;  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(1)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra; edges with three equivalent Sn(1)Cu12 cuboctahedra; edges with three equivalent Sn(5)Cu12 cuboctahedra; edges with five equivalent Cu(10)Cu8Sn4 cuboctahedra;  a faceface with one Cu(1)Cu8Sn4 cuboctahedra;  a faceface with one Sn(5)Cu12 cuboctahedra; faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra; faces with three equivalent Cu(5)Cu8Sn4 cuboctahedra; faces with three equivalent Sn(1)Cu12 cuboctahedra; and faces with ten Cu(6,6,6)Cu8Sn4 cuboctahedra. In the ninth Cu site, Cu(7) is bonded to one Cu(1), one Cu(2), two equivalent Cu(10), two equivalent Cu(4), two equivalent Cu(7), one Sn(4), one Sn(5), and two equivalent Sn(2) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(6)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with six equivalent Cu(7)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(1)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(2)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(6)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(4)Cu12 cuboctahedra,  an edgeedge with one Sn(5)Cu12 cuboctahedra, edges with two equivalent Cu(4)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(1)Cu12 cuboctahedra, edges with two equivalent Sn(2)Cu12 cuboctahedra, edges with four equivalent Cu(9)Cu8Sn4 cuboctahedra,  a faceface with one Cu(1)Cu8Sn4 cuboctahedra,  a faceface with one Cu(2)Cu8Sn4 cuboctahedra,  a faceface with one Sn(4)Cu12 cuboctahedra,  a faceface with one Sn(5)Cu12 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with four equivalent Cu(7)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(10)Cu8Sn4 cuboctahedra. In the tenth Cu site, Cu(8) is bonded to one Cu(2), two equivalent Cu(8), two equivalent Cu(9), three equivalent Cu(3), one Sn(4), and three equivalent Sn(3) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with six equivalent Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(2)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(4)Cu12 cuboctahedra, edges with two equivalent Cu(4)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(2)Cu12 cuboctahedra, edges with three equivalent Cu(3)Cu8Sn4 cuboctahedra, edges with three equivalent Sn(3)Cu12 cuboctahedra, edges with four equivalent Cu(8)Cu8Sn4 cuboctahedra,  a faceface with one Cu(2)Cu8Sn4 cuboctahedra,  a faceface with one Sn(4)Cu12 cuboctahedra, faces with three equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with three equivalent Sn(3)Cu12 cuboctahedra, faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(9)Cu8Sn4 cuboctahedra. In the eleventh Cu site, Cu(9) is bonded to one Cu(3), one Cu(4), two equivalent Cu(2), two equivalent Cu(8), two equivalent Cu(9), one Sn(2), one Sn(3), and two equivalent Sn(4) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with six equivalent Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(10)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with two equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(4)Cu12 cuboctahedra, edges with three equivalent Cu(3)Cu8Sn4 cuboctahedra, edges with three equivalent Sn(3)Cu12 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra,  a faceface with one Cu(3)Cu8Sn4 cuboctahedra,  a faceface with one Cu(4)Cu8Sn4 cuboctahedra,  a faceface with one Sn(2)Cu12 cuboctahedra,  a faceface with one Sn(3)Cu12 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Cu(9)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra. In the twelfth Cu site, Cu(10) is bonded to one Cu(4), one Cu(5), two equivalent Cu(1), two equivalent Cu(10), two equivalent Cu(7), one Sn(1), one Sn(2), and two equivalent Sn(5) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(6)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with six equivalent Cu(10)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(5)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(1)Cu12 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with two equivalent Cu(1)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(4)Cu12 cuboctahedra, edges with two equivalent Sn(5)Cu12 cuboctahedra, edges with five equivalent Cu(6)Cu8Sn4 cuboctahedra,  a faceface with one Cu(4)Cu8Sn4 cuboctahedra,  a faceface with one Cu(5)Cu8Sn4 cuboctahedra,  a faceface with one Sn(1)Cu12 cuboctahedra,  a faceface with one Sn(2)Cu12 cuboctahedra, faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(6)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(5)Cu12 cuboctahedra, faces with four equivalent Cu(10)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(7)Cu8Sn4 cuboctahedra. There are five inequivalent Sn sites. In the first Sn site, Sn(3) is bonded to two equivalent Cu(9), four equivalent Cu(3), and six equivalent Cu(8) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with four equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with five equivalent Sn(4)Cu12 cuboctahedra, edges with six equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with four equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra, and faces with six equivalent Sn(3)Cu12 cuboctahedra. In the second Sn site, Sn(4) is bonded to two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(7), two equivalent Cu(8), and four equivalent Cu(9) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with four equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(5)Cu12 cuboctahedra, edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with five equivalent Sn(3)Cu12 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(8)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Cu(9)Cu8Sn4 cuboctahedra, and faces with four equivalent Sn(2)Cu12 cuboctahedra. In the third Sn site, Sn(5) is bonded to two equivalent Cu(1); two equivalent Cu(5); two Cu(6,6); two equivalent Cu(7); and four equivalent Cu(10) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(1)Cu12 cuboctahedra; corners with two equivalent Sn(5)Cu12 cuboctahedra; corners with four equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with four Cu(6,6)Cu8Sn4 cuboctahedra; corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra;  an edgeedge with one Cu(5)Cu8Sn4 cuboctahedra;  an edgeedge with one Sn(4)Cu12 cuboctahedra; edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra; edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra; edges with four equivalent Sn(2)Cu12 cuboctahedra; edges with six Cu(6,6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(5)Cu8Sn4 cuboctahedra; faces with two Cu(6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra; faces with two equivalent Sn(5)Cu12 cuboctahedra; faces with four equivalent Cu(10)Cu8Sn4 cuboctahedra; and faces with four equivalent Sn(1)Cu12 cuboctahedra. In the fourth Sn site, Sn(1) is bonded to two equivalent Cu(1), two equivalent Cu(10), two equivalent Cu(5), and six equivalent Cu(6) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(6)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(1)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(6)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with four equivalent Sn(1)Cu12 cuboctahedra, faces with four equivalent Sn(5)Cu12 cuboctahedra, and faces with six equivalent Cu(6)Cu8Sn4 cuboctahedra. In the fifth Sn site, Sn(2) is bonded to two equivalent Cu(10), two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(9), and four equivalent Cu(7) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(1)Cu12 cuboctahedra,  an edgeedge with one Sn(3)Cu12 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with four equivalent Sn(5)Cu12 cuboctahedra, faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with four equivalent Cu(7)Cu8Sn4 cuboctahedra, and faces with four equivalent Sn(4)Cu12 cuboctahedra.
Cu3Sn is beta-derived structured and crystallizes in the orthorhombic Cmcm space group. There are twelve inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two Cu(6,6); two equivalent Cu(7); four equivalent Cu(10); two equivalent Sn(1); and two equivalent Sn(5) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(4)Cu12 cuboctahedra; corners with four Cu(6,6)Cu8Sn4 cuboctahedra; corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra; corners with four equivalent Sn(5)Cu12 cuboctahedra;  an edgeedge with one Cu(2)Cu8Sn4 cuboctahedra;  an edgeedge with one Sn(1)Cu12 cuboctahedra; edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra; edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra; edges with four equivalent Cu(4)Cu8Sn4 cuboctahedra; edges with six Cu(6,6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra; faces with two Cu(6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra; faces with two equivalent Sn(1)Cu12 cuboctahedra; faces with two equivalent Sn(2)Cu12 cuboctahedra; faces with two equivalent Sn(5)Cu12 cuboctahedra; faces with four equivalent Cu(10)Cu8Sn4 cuboctahedra; and faces with four equivalent Cu(5)Cu8Sn4 cuboctahedra. Both Cu(1)-Cu(6,6) bond lengths are 2.98 Å. Both Cu(1)-Cu(7) bond lengths are 2.61 Å. All Cu(1)-Cu(10) bond lengths are 2.66 Å. Both Cu(1)-Sn(1) bond lengths are 2.75 Å. Both Cu(1)-Sn(5) bond lengths are 2.82 Å. In the second Cu site, Cu(2) is bonded to two equivalent Cu(7), two equivalent Cu(8), four equivalent Cu(9), two equivalent Sn(2), and two equivalent Sn(4) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(4)Cu12 cuboctahedra,  an edgeedge with one Cu(1)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with five equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(8)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with two equivalent Sn(3)Cu12 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Cu(4)Cu8Sn4 cuboctahedra, and faces with four equivalent Cu(9)Cu8Sn4 cuboctahedra. Both Cu(2)-Cu(7) bond lengths are 2.98 Å. Both Cu(2)-Cu(8) bond lengths are 2.59 Å. All Cu(2)-Cu(9) bond lengths are 2.66 Å. Both Cu(2)-Sn(2) bond lengths are 2.76 Å. Both Cu(2)-Sn(4) bond lengths are 2.83 Å. In the third Cu site, Cu(3) is bonded to two equivalent Cu(9), six equivalent Cu(8), and four equivalent Sn(3) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(3)Cu12 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra, edges with five equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Sn(3)Cu12 cuboctahedra, faces with six equivalent Cu(3)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra. Both Cu(3)-Cu(9) bond lengths are 2.58 Å. There are four shorter (2.66 Å) and two longer (3.00 Å) Cu(3)-Cu(8) bond lengths. There are two shorter (2.77 Å) and two longer (2.83 Å) Cu(3)-Sn(3) bond lengths. In the fourth Cu site, Cu(4) is bonded to two equivalent Cu(10), two equivalent Cu(9), four equivalent Cu(7), two equivalent Sn(2), and two equivalent Sn(4) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(2)Cu12 cuboctahedra,  an edgeedge with one Cu(3)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(5)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(1)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(8)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with two equivalent Sn(5)Cu12 cuboctahedra, faces with four equivalent Cu(2)Cu8Sn4 cuboctahedra, and faces with four equivalent Cu(7)Cu8Sn4 cuboctahedra. Both Cu(4)-Cu(10) bond lengths are 2.59 Å. Both Cu(4)-Cu(9) bond lengths are 3.01 Å. All Cu(4)-Cu(7) bond lengths are 2.66 Å. Both Cu(4)-Sn(2) bond lengths are 2.83 Å. Both Cu(4)-Sn(4) bond lengths are 2.77 Å. In the fifth Cu site, Cu(5) is bonded to two equivalent Cu(10), six equivalent Cu(6), two equivalent Sn(1), and two equivalent Sn(5) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(6)Cu8Sn4 cuboctahedra, corners with four equivalent Sn(1)Cu12 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(5)Cu12 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with four equivalent Sn(1)Cu12 cuboctahedra, edges with six equivalent Cu(6)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(1)Cu12 cuboctahedra, faces with two equivalent Sn(5)Cu12 cuboctahedra, faces with four equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with four equivalent Cu(5)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(6)Cu8Sn4 cuboctahedra. Both Cu(5)-Cu(10) bond lengths are 2.97 Å. There are two shorter (2.57 Å) and four longer (2.64 Å) Cu(5)-Cu(6) bond lengths. Both Cu(5)-Sn(1) bond lengths are 2.83 Å. Both Cu(5)-Sn(5) bond lengths are 2.77 Å. In the sixth Cu site, Cu(6) is bonded to one Cu(1), three equivalent Cu(5), four equivalent Cu(6), one Sn(5), and three equivalent Sn(1) atoms to form CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(1)Cu12 cuboctahedra; corners with two equivalent Sn(5)Cu12 cuboctahedra; corners with six Cu(6,6)Cu8Sn4 cuboctahedra;  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(1)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra; edges with three equivalent Sn(1)Cu12 cuboctahedra; edges with three equivalent Sn(5)Cu12 cuboctahedra; edges with five equivalent Cu(10)Cu8Sn4 cuboctahedra;  a faceface with one Cu(1)Cu8Sn4 cuboctahedra;  a faceface with one Sn(5)Cu12 cuboctahedra; faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra; faces with three equivalent Cu(5)Cu8Sn4 cuboctahedra; faces with three equivalent Sn(1)Cu12 cuboctahedra; and faces with ten Cu(6,6,6)Cu8Sn4 cuboctahedra. There is one shorter (2.57 Å) and two longer (2.64 Å) Cu(6)-Cu(5) bond lengths. There are a spread of Cu(6)-Cu(6) bond distances ranging from 2.63-2.96 Å. The Cu(6)-Sn(5) bond length is 2.77 Å. There are two shorter (2.77 Å) and one longer (2.80 Å) Cu(6)-Sn(1) bond length. In the seventh Cu site, Cu(6) is bonded to one Cu(1), three equivalent Cu(5), four equivalent Cu(6), one Sn(5), and three equivalent Sn(1) atoms to form CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with six equivalent Cu(6)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(1)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with three equivalent Sn(1)Cu12 cuboctahedra, edges with three equivalent Sn(5)Cu12 cuboctahedra, edges with five equivalent Cu(10)Cu8Sn4 cuboctahedra,  a faceface with one Cu(1)Cu8Sn4 cuboctahedra,  a faceface with one Sn(5)Cu12 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with three equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with three equivalent Sn(1)Cu12 cuboctahedra, and faces with ten equivalent Cu(6)Cu8Sn4 cuboctahedra. There are a spread of Cu(6)-Cu(6) bond distances ranging from 2.63-2.96 Å. The Cu(6)-Sn(5) bond length is 2.77 Å. There are two shorter (2.77 Å) and one longer (2.80 Å) Cu(6)-Sn(1) bond length. In the eighth Cu site, Cu(6) is bonded to one Cu(1), three equivalent Cu(5), four equivalent Cu(6), one Sn(5), and three equivalent Sn(1) atoms to form CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra; corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(1)Cu12 cuboctahedra; corners with two equivalent Sn(5)Cu12 cuboctahedra; corners with six Cu(6,6)Cu8Sn4 cuboctahedra;  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(1)Cu8Sn4 cuboctahedra; edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra; edges with three equivalent Sn(1)Cu12 cuboctahedra; edges with three equivalent Sn(5)Cu12 cuboctahedra; edges with five equivalent Cu(10)Cu8Sn4 cuboctahedra;  a faceface with one Cu(1)Cu8Sn4 cuboctahedra;  a faceface with one Sn(5)Cu12 cuboctahedra; faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra; faces with three equivalent Cu(5)Cu8Sn4 cuboctahedra; faces with three equivalent Sn(1)Cu12 cuboctahedra; and faces with ten Cu(6,6,6)Cu8Sn4 cuboctahedra. The Cu(6)-Cu(1) bond length is 2.98 Å. There is one shorter (2.57 Å) and two longer (2.64 Å) Cu(6)-Cu(5) bond lengths. There are a spread of Cu(6)-Cu(6) bond distances ranging from 2.63-2.96 Å. The Cu(6)-Sn(5) bond length is 2.77 Å. There are two shorter (2.77 Å) and one longer (2.80 Å) Cu(6)-Sn(1) bond length. In the ninth Cu site, Cu(7) is bonded to one Cu(1), one Cu(2), two equivalent Cu(10), two equivalent Cu(4), two equivalent Cu(7), one Sn(4), one Sn(5), and two equivalent Sn(2) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(6)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with six equivalent Cu(7)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(1)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(2)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(6)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(4)Cu12 cuboctahedra,  an edgeedge with one Sn(5)Cu12 cuboctahedra, edges with two equivalent Cu(4)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(1)Cu12 cuboctahedra, edges with two equivalent Sn(2)Cu12 cuboctahedra, edges with four equivalent Cu(9)Cu8Sn4 cuboctahedra,  a faceface with one Cu(1)Cu8Sn4 cuboctahedra,  a faceface with one Cu(2)Cu8Sn4 cuboctahedra,  a faceface with one Sn(4)Cu12 cuboctahedra,  a faceface with one Sn(5)Cu12 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with four equivalent Cu(7)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(10)Cu8Sn4 cuboctahedra. Both Cu(7)-Cu(10) bond lengths are 2.63 Å. There is one shorter (2.81 Å) and one longer (2.83 Å) Cu(7)-Cu(7) bond length. The Cu(7)-Sn(4) bond length is 2.77 Å. The Cu(7)-Sn(5) bond length is 2.74 Å. Both Cu(7)-Sn(2) bond lengths are 2.75 Å. In the tenth Cu site, Cu(8) is bonded to one Cu(2), two equivalent Cu(8), two equivalent Cu(9), three equivalent Cu(3), one Sn(4), and three equivalent Sn(3) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with six equivalent Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(2)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(7)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(4)Cu12 cuboctahedra, edges with two equivalent Cu(4)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(2)Cu12 cuboctahedra, edges with three equivalent Cu(3)Cu8Sn4 cuboctahedra, edges with three equivalent Sn(3)Cu12 cuboctahedra, edges with four equivalent Cu(8)Cu8Sn4 cuboctahedra,  a faceface with one Cu(2)Cu8Sn4 cuboctahedra,  a faceface with one Sn(4)Cu12 cuboctahedra, faces with three equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with three equivalent Sn(3)Cu12 cuboctahedra, faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(9)Cu8Sn4 cuboctahedra. There is one shorter (2.78 Å) and one longer (2.86 Å) Cu(8)-Cu(8) bond length. Both Cu(8)-Cu(9) bond lengths are 2.62 Å. The Cu(8)-Sn(4) bond length is 2.76 Å. There are two shorter (2.75 Å) and one longer (2.77 Å) Cu(8)-Sn(3) bond length. In the eleventh Cu site, Cu(9) is bonded to one Cu(3), one Cu(4), two equivalent Cu(2), two equivalent Cu(8), two equivalent Cu(9), one Sn(2), one Sn(3), and two equivalent Sn(4) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with six equivalent Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(10)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with two equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(4)Cu12 cuboctahedra, edges with three equivalent Cu(3)Cu8Sn4 cuboctahedra, edges with three equivalent Sn(3)Cu12 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra,  a faceface with one Cu(3)Cu8Sn4 cuboctahedra,  a faceface with one Cu(4)Cu8Sn4 cuboctahedra,  a faceface with one Sn(2)Cu12 cuboctahedra,  a faceface with one Sn(3)Cu12 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Cu(9)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra. There is one shorter (2.78 Å) and one longer (2.86 Å) Cu(9)-Cu(9) bond length. The Cu(9)-Sn(2) bond length is 2.76 Å. The Cu(9)-Sn(3) bond length is 2.76 Å. Both Cu(9)-Sn(4) bond lengths are 2.75 Å. In the twelfth Cu site, Cu(10) is bonded to one Cu(4), one Cu(5), two equivalent Cu(1), two equivalent Cu(10), two equivalent Cu(7), one Sn(1), one Sn(2), and two equivalent Sn(5) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(6)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(9)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with six equivalent Cu(10)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(4)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(5)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(1)Cu12 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with two equivalent Cu(1)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with two equivalent Sn(4)Cu12 cuboctahedra, edges with two equivalent Sn(5)Cu12 cuboctahedra, edges with five equivalent Cu(6)Cu8Sn4 cuboctahedra,  a faceface with one Cu(4)Cu8Sn4 cuboctahedra,  a faceface with one Cu(5)Cu8Sn4 cuboctahedra,  a faceface with one Sn(1)Cu12 cuboctahedra,  a faceface with one Sn(2)Cu12 cuboctahedra, faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(6)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(5)Cu12 cuboctahedra, faces with four equivalent Cu(10)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(7)Cu8Sn4 cuboctahedra. There is one shorter (2.75 Å) and one longer (2.89 Å) Cu(10)-Cu(10) bond length. The Cu(10)-Sn(1) bond length is 2.77 Å. The Cu(10)-Sn(2) bond length is 2.76 Å. Both Cu(10)-Sn(5) bond lengths are 2.75 Å. There are five inequivalent Sn sites. In the first Sn site, Sn(3) is bonded to two equivalent Cu(9), four equivalent Cu(3), and six equivalent Cu(8) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(3)Cu12 cuboctahedra, corners with four equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with five equivalent Sn(4)Cu12 cuboctahedra, edges with six equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with four equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with six equivalent Cu(8)Cu8Sn4 cuboctahedra, and faces with six equivalent Sn(3)Cu12 cuboctahedra. In the second Sn site, Sn(4) is bonded to two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(7), two equivalent Cu(8), and four equivalent Cu(9) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(1)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(4)Cu12 cuboctahedra, corners with four equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(8)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(5)Cu12 cuboctahedra, edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with five equivalent Sn(3)Cu12 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(8)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(4)Cu12 cuboctahedra, faces with four equivalent Cu(9)Cu8Sn4 cuboctahedra, and faces with four equivalent Sn(2)Cu12 cuboctahedra. In the third Sn site, Sn(5) is bonded to two equivalent Cu(1); two equivalent Cu(5); two Cu(6,6); two equivalent Cu(7); and four equivalent Cu(10) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(2)Cu8Sn4 cuboctahedra; corners with two equivalent Sn(1)Cu12 cuboctahedra; corners with two equivalent Sn(5)Cu12 cuboctahedra; corners with four equivalent Cu(1)Cu8Sn4 cuboctahedra; corners with four Cu(6,6)Cu8Sn4 cuboctahedra; corners with four equivalent Cu(7)Cu8Sn4 cuboctahedra;  an edgeedge with one Cu(5)Cu8Sn4 cuboctahedra;  an edgeedge with one Sn(4)Cu12 cuboctahedra; edges with two equivalent Cu(7)Cu8Sn4 cuboctahedra; edges with four equivalent Cu(10)Cu8Sn4 cuboctahedra; edges with four equivalent Sn(2)Cu12 cuboctahedra; edges with six Cu(6,6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(5)Cu8Sn4 cuboctahedra; faces with two Cu(6,6)Cu8Sn4 cuboctahedra; faces with two equivalent Cu(7)Cu8Sn4 cuboctahedra; faces with two equivalent Sn(5)Cu12 cuboctahedra; faces with four equivalent Cu(10)Cu8Sn4 cuboctahedra; and faces with four equivalent Sn(1)Cu12 cuboctahedra. In the fourth Sn site, Sn(1) is bonded to two equivalent Cu(1), two equivalent Cu(10), two equivalent Cu(5), and six equivalent Cu(6) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(1)Cu12 cuboctahedra, corners with two equivalent Sn(5)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(6)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(1)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(2)Cu12 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(6)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with four equivalent Sn(1)Cu12 cuboctahedra, faces with four equivalent Sn(5)Cu12 cuboctahedra, and faces with six equivalent Cu(6)Cu8Sn4 cuboctahedra. In the fifth Sn site, Sn(2) is bonded to two equivalent Cu(10), two equivalent Cu(2), two equivalent Cu(4), two equivalent Cu(9), and four equivalent Cu(7) atoms to form SnCu12 cuboctahedra that share corners with two equivalent Cu(3)Cu8Sn4 cuboctahedra, corners with two equivalent Cu(5)Cu8Sn4 cuboctahedra, corners with two equivalent Sn(2)Cu12 cuboctahedra, corners with four equivalent Cu(10)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(4)Cu8Sn4 cuboctahedra, corners with four equivalent Cu(9)Cu8Sn4 cuboctahedra,  an edgeedge with one Sn(1)Cu12 cuboctahedra,  an edgeedge with one Sn(3)Cu12 cuboctahedra, edges with two equivalent Cu(10)Cu8Sn4 cuboctahedra, edges with two equivalent Cu(9)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(7)Cu8Sn4 cuboctahedra, edges with four equivalent Cu(8)Cu8Sn4 cuboctahedra, edges with four equivalent Sn(5)Cu12 cuboctahedra, faces with two equivalent Cu(1)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(10)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(4)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(9)Cu8Sn4 cuboctahedra, faces with two equivalent Sn(2)Cu12 cuboctahedra, faces with four equivalent Cu(7)Cu8Sn4 cuboctahedra, and faces with four equivalent Sn(4)Cu12 cuboctahedra.