Sm3Co4Sn13 crystallizes in the cubic Pm-3n space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Co(1) and twelve equivalent Sn(2) atoms. Co(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Sn(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1), two equivalent Co(1), one Sn(1), and three equivalent Sn(2) atoms. In the second Sn site, Sn(1) is bonded in a cuboctahedral geometry to twelve equivalent Sn(2) atoms.
Sm3Co4Sn13 crystallizes in the cubic Pm-3n space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Co(1) and twelve equivalent Sn(2) atoms. All Sm(1)-Co(1) bond lengths are 3.37 Å. There are four shorter (3.30 Å) and eight longer (3.39 Å) Sm(1)-Sn(2) bond lengths. Co(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Sn(2) atoms. All Co(1)-Sn(2) bond lengths are 2.59 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1), two equivalent Co(1), one Sn(1), and three equivalent Sn(2) atoms. The Sn(2)-Sn(1) bond length is 3.26 Å. There is one shorter (3.02 Å) and two longer (3.18 Å) Sn(2)-Sn(2) bond lengths. In the second Sn site, Sn(1) is bonded in a cuboctahedral geometry to twelve equivalent Sn(2) atoms.