Na10YbSn12 crystallizes in the cubic I-43m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to four equivalent Sn(1) atoms to form corner-sharing NaSn4 tetrahedra. In the second Na site, Na(2) is bonded in a 9-coordinate geometry to one Yb(1) and nine equivalent Sn(1) atoms. Yb(1) is bonded in a 16-coordinate geometry to four equivalent Na(2) and twelve equivalent Sn(1) atoms. Sn(1) is bonded in a 9-coordinate geometry to two equivalent Na(1), three equivalent Na(2), one Yb(1), and three equivalent Sn(1) atoms.
Na10YbSn12 crystallizes in the cubic I-43m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to four equivalent Sn(1) atoms to form corner-sharing NaSn4 tetrahedra. All Na(1)-Sn(1) bond lengths are 3.22 Å. In the second Na site, Na(2) is bonded in a 9-coordinate geometry to one Yb(1) and nine equivalent Sn(1) atoms. The Na(2)-Yb(1) bond length is 3.73 Å. There are three shorter (3.44 Å) and six longer (3.50 Å) Na(2)-Sn(1) bond lengths. Yb(1) is bonded in a 16-coordinate geometry to four equivalent Na(2) and twelve equivalent Sn(1) atoms. All Yb(1)-Sn(1) bond lengths are 3.43 Å. Sn(1) is bonded in a 9-coordinate geometry to two equivalent Na(1), three equivalent Na(2), one Yb(1), and three equivalent Sn(1) atoms. There is one shorter (2.88 Å) and two longer (2.97 Å) Sn(1)-Sn(1) bond lengths.