Yb3Cu4Sn4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Sn(1), and four equivalent Sn(2) atoms. In the second Yb site, Yb(2) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted edge-sharing YbSn6 octahedra. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Yb(1), one Cu(1), one Sn(2), and three equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Yb(2), two equivalent Yb(1), and six equivalent Cu(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Yb(2), four equivalent Yb(1), two equivalent Cu(1), and one Sn(2) atom.
Yb3Cu4Sn4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Sn(1), and four equivalent Sn(2) atoms. There are two shorter (3.17 Å) and four longer (3.22 Å) Yb(1)-Cu(1) bond lengths. Both Yb(1)-Sn(1) bond lengths are 3.15 Å. All Yb(1)-Sn(2) bond lengths are 3.30 Å. In the second Yb site, Yb(2) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted edge-sharing YbSn6 octahedra. Both Yb(2)-Sn(1) bond lengths are 3.19 Å. All Yb(2)-Sn(2) bond lengths are 3.11 Å. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Yb(1), one Cu(1), one Sn(2), and three equivalent Sn(1) atoms. The Cu(1)-Cu(1) bond length is 2.65 Å. The Cu(1)-Sn(2) bond length is 2.62 Å. There are two shorter (2.71 Å) and one longer (2.75 Å) Cu(1)-Sn(1) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Yb(2), two equivalent Yb(1), and six equivalent Cu(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Yb(2), four equivalent Yb(1), two equivalent Cu(1), and one Sn(2) atom. The Sn(2)-Sn(2) bond length is 2.81 Å.