Yb3Cu6Sn5 crystallizes in the orthorhombic Immm space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to four equivalent Cu(2) and eight equivalent Sn(1) atoms to form distorted YbCu4Sn8 cuboctahedra that share edges with two equivalent Sn(2)Yb4Cu8 cuboctahedra and faces with two equivalent Yb(1)Cu4Sn8 cuboctahedra. In the second Yb site, Yb(2) is bonded in a 14-coordinate geometry to two equivalent Cu(1), four equivalent Cu(2), two equivalent Sn(2), and six equivalent Sn(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 10-coordinate geometry to two equivalent Yb(2), four equivalent Cu(2), two equivalent Sn(1), and two equivalent Sn(2) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to one Yb(1), two equivalent Yb(2), two equivalent 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 10-coordinate geometry to two equivalent Yb(1), three equivalent Yb(2), one Cu(1), three equivalent Cu(2), and one Sn(1) atom. In the second Sn site, Sn(2) is bonded to four equivalent Yb(2), four equivalent Cu(1), and four equivalent Cu(2) atoms to form SnYb4Cu8 cuboctahedra that share edges with two equivalent Yb(1)Cu4Sn8 cuboctahedra and faces with two equivalent Sn(2)Yb4Cu8 cuboctahedra.
Yb3Cu6Sn5 crystallizes in the orthorhombic Immm space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to four equivalent Cu(2) and eight equivalent Sn(1) atoms to form distorted YbCu4Sn8 cuboctahedra that share edges with two equivalent Sn(2)Yb4Cu8 cuboctahedra and faces with two equivalent Yb(1)Cu4Sn8 cuboctahedra. All Yb(1)-Cu(2) bond lengths are 3.12 Å. All Yb(1)-Sn(1) bond lengths are 3.43 Å. In the second Yb site, Yb(2) is bonded in a 14-coordinate geometry to two equivalent Cu(1), four equivalent Cu(2), two equivalent Sn(2), and six equivalent Sn(1) atoms. Both Yb(2)-Cu(1) bond lengths are 3.04 Å. All Yb(2)-Cu(2) bond lengths are 3.18 Å. Both Yb(2)-Sn(2) bond lengths are 3.20 Å. There are four shorter (3.17 Å) and two longer (3.40 Å) Yb(2)-Sn(1) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 10-coordinate geometry to two equivalent Yb(2), four equivalent Cu(2), two equivalent Sn(1), and two equivalent Sn(2) atoms. All Cu(1)-Cu(2) bond lengths are 2.63 Å. Both Cu(1)-Sn(1) bond lengths are 2.65 Å. Both Cu(1)-Sn(2) bond lengths are 2.89 Å. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to one Yb(1), two equivalent Yb(2), two equivalent Cu(1), one Sn(2), and three equivalent Sn(1) atoms. The Cu(2)-Sn(2) bond length is 2.61 Å. There are two shorter (2.60 Å) and one longer (2.73 Å) Cu(2)-Sn(1) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Yb(1), three equivalent Yb(2), one Cu(1), three equivalent Cu(2), and one Sn(1) atom. The Sn(1)-Sn(1) bond length is 3.01 Å. In the second Sn site, Sn(2) is bonded to four equivalent Yb(2), four equivalent Cu(1), and four equivalent Cu(2) atoms to form SnYb4Cu8 cuboctahedra that share edges with two equivalent Yb(1)Cu4Sn8 cuboctahedra and faces with two equivalent Sn(2)Yb4Cu8 cuboctahedra.