Cu10Sn3 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the hexagonal P6_3 space group. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted q6 geometry to one Cu(4); one Cu(6); three equivalent Cu(2); three equivalent Cu(5); and three Sn(1,1) atoms. In the second Cu site, Cu(2) is bonded to one Cu(1); one Cu(3); one Cu(4); one Cu(6); four equivalent Cu(5); and four Sn(1,1) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(3)Cu6Sn6 cuboctahedra, corners with eight equivalent Cu(5)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(3)Cu6Sn6 cuboctahedra, edges with two equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu6Sn6 cuboctahedra, faces with four equivalent Cu(5)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(2)Cu8Sn4 cuboctahedra. In the third Cu site, Cu(3) is bonded to three equivalent Cu(2); three equivalent Cu(5); and six Sn(1,1) atoms to form CuCu6Sn6 cuboctahedra that share corners with six equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with six equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu6Sn6 cuboctahedra, faces with six equivalent Cu(2)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(5)Cu8Sn4 cuboctahedra. In the fourth Cu site, Cu(4) is bonded in a 11-coordinate geometry to one Cu(1); one Cu(6); three equivalent Cu(2); three equivalent Cu(5); and three Sn(1,1) atoms. In the fifth Cu site, Cu(5) is bonded to one Cu(1); one Cu(3); one Cu(4); one Cu(6); four equivalent Cu(2); and four Sn(1,1) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(3)Cu6Sn6 cuboctahedra, corners with eight equivalent Cu(2)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(3)Cu6Sn6 cuboctahedra, edges with two equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu6Sn6 cuboctahedra, faces with four equivalent Cu(2)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(5)Cu8Sn4 cuboctahedra. In the sixth Cu site, Cu(6) is bonded in a distorted q6 geometry to one Cu(1); one Cu(4); three equivalent Cu(2); three equivalent Cu(5); and three Sn(1,1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 13-coordinate geometry to one Cu(1), one Cu(4), one Cu(6), two equivalent Cu(3), four equivalent Cu(2), and four equivalent Cu(5) atoms. In the second Sn site, Sn(1) is bonded in a 13-coordinate geometry to one Cu(1), one Cu(4), one Cu(6), two equivalent Cu(3), four equivalent Cu(2), and four equivalent Cu(5) atoms.
Cu10Sn3 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the hexagonal P6_3 space group. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted q6 geometry to one Cu(4); one Cu(6); three equivalent Cu(2); three equivalent Cu(5); and three Sn(1,1) atoms. The Cu(1)-Cu(4) bond length is 2.60 Å. The Cu(1)-Cu(6) bond length is 2.74 Å. All Cu(1)-Cu(2) bond lengths are 2.59 Å. All Cu(1)-Cu(5) bond lengths are 2.58 Å. All Cu(1)-Sn(1,1) bond lengths are 2.80 Å. In the second Cu site, Cu(2) is bonded to one Cu(1); one Cu(3); one Cu(4); one Cu(6); four equivalent Cu(5); and four Sn(1,1) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(3)Cu6Sn6 cuboctahedra, corners with eight equivalent Cu(5)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(3)Cu6Sn6 cuboctahedra, edges with two equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(2)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu6Sn6 cuboctahedra, faces with four equivalent Cu(5)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(2)Cu8Sn4 cuboctahedra. The Cu(2)-Cu(3) bond length is 2.61 Å. The Cu(2)-Cu(4) bond length is 2.62 Å. The Cu(2)-Cu(6) bond length is 2.57 Å. There are a spread of Cu(2)-Cu(5) bond distances ranging from 2.64-2.86 Å. There are a spread of Cu(2)-Sn(1,1) bond distances ranging from 2.66-2.92 Å. In the third Cu site, Cu(3) is bonded to three equivalent Cu(2); three equivalent Cu(5); and six Sn(1,1) atoms to form CuCu6Sn6 cuboctahedra that share corners with six equivalent Cu(2)Cu8Sn4 cuboctahedra, corners with six equivalent Cu(5)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with three equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu6Sn6 cuboctahedra, faces with six equivalent Cu(2)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(5)Cu8Sn4 cuboctahedra. All Cu(3)-Cu(5) bond lengths are 2.63 Å. There are three shorter (2.95 Å) and three longer (3.04 Å) Cu(3)-Sn(1,1) bond lengths. In the fourth Cu site, Cu(4) is bonded in a 11-coordinate geometry to one Cu(1); one Cu(6); three equivalent Cu(2); three equivalent Cu(5); and three Sn(1,1) atoms. The Cu(4)-Cu(6) bond length is 2.59 Å. All Cu(4)-Cu(5) bond lengths are 2.62 Å. All Cu(4)-Sn(1,1) bond lengths are 2.69 Å. In the fifth Cu site, Cu(5) is bonded to one Cu(1); one Cu(3); one Cu(4); one Cu(6); four equivalent Cu(2); and four Sn(1,1) atoms to form distorted CuCu8Sn4 cuboctahedra that share corners with two equivalent Cu(3)Cu6Sn6 cuboctahedra, corners with eight equivalent Cu(2)Cu8Sn4 cuboctahedra,  an edgeedge with one Cu(3)Cu6Sn6 cuboctahedra, edges with two equivalent Cu(2)Cu8Sn4 cuboctahedra, edges with six equivalent Cu(5)Cu8Sn4 cuboctahedra, faces with two equivalent Cu(3)Cu6Sn6 cuboctahedra, faces with four equivalent Cu(2)Cu8Sn4 cuboctahedra, and faces with six equivalent Cu(5)Cu8Sn4 cuboctahedra. The Cu(5)-Cu(6) bond length is 2.60 Å. There are a spread of Cu(5)-Sn(1,1) bond distances ranging from 2.66-2.93 Å. In the sixth Cu site, Cu(6) is bonded in a distorted q6 geometry to one Cu(1); one Cu(4); three equivalent Cu(2); three equivalent Cu(5); and three Sn(1,1) atoms. All Cu(6)-Sn(1,1) bond lengths are 2.80 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 13-coordinate geometry to one Cu(1), one Cu(4), one Cu(6), two equivalent Cu(3), four equivalent Cu(2), and four equivalent Cu(5) atoms. In the second Sn site, Sn(1) is bonded in a 13-coordinate geometry to one Cu(1), one Cu(4), one Cu(6), two equivalent Cu(3), four equivalent Cu(2), and four equivalent Cu(5) atoms.