Cu10Sn3 crystallizes in the trigonal P-31m space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one Cu(2), two equivalent Cu(1), and two equivalent Sn(1) atoms. In the second Cu site, Cu(2) is bonded in a 6-coordinate geometry to three equivalent Cu(1) and three equivalent Cu(3) atoms. In the third Cu site, Cu(3) is bonded in a 5-coordinate geometry to one Cu(2), two equivalent Cu(4), two equivalent Sn(1), and two equivalent Sn(2) atoms. In the fourth Cu site, Cu(4) is bonded in a 6-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), and two equivalent Sn(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 6-coordinate geometry to three equivalent Cu(1), three equivalent Cu(3), and one Sn(2) atom. In the second Sn site, Sn(2) is bonded in a 14-coordinate geometry to six equivalent Cu(3), six equivalent Cu(4), and two equivalent Sn(1) atoms.
Cu10Sn3 crystallizes in the trigonal P-31m space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one Cu(2), two equivalent Cu(1), and two equivalent Sn(1) atoms. The Cu(1)-Cu(2) bond length is 2.48 Å. Both Cu(1)-Cu(1) bond lengths are 2.49 Å. Both Cu(1)-Sn(1) bond lengths are 2.65 Å. In the second Cu site, Cu(2) is bonded in a 6-coordinate geometry to three equivalent Cu(1) and three equivalent Cu(3) atoms. All Cu(2)-Cu(3) bond lengths are 2.47 Å. In the third Cu site, Cu(3) is bonded in a 5-coordinate geometry to one Cu(2), two equivalent Cu(4), two equivalent Sn(1), and two equivalent Sn(2) atoms. Both Cu(3)-Cu(4) bond lengths are 2.48 Å. Both Cu(3)-Sn(1) bond lengths are 2.62 Å. Both Cu(3)-Sn(2) bond lengths are 3.21 Å. In the fourth Cu site, Cu(4) is bonded in a 6-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), and two equivalent Sn(2) atoms. Both Cu(4)-Cu(4) bond lengths are 2.54 Å. Both Cu(4)-Sn(2) bond lengths are 2.78 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 6-coordinate geometry to three equivalent Cu(1), three equivalent Cu(3), and one Sn(2) atom. The Sn(1)-Sn(2) bond length is 2.93 Å. In the second Sn site, Sn(2) is bonded in a 14-coordinate geometry to six equivalent Cu(3), six equivalent Cu(4), and two equivalent Sn(1) atoms.