SmNi3Sn2 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. In the second Sm site, Sm(2) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Ni(2), and six equivalent Sn(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), two equivalent Ni(2), and four equivalent Sn(1) atoms. In the second Ni site, Ni(2) is bonded to four equivalent Sm(2), four equivalent Ni(1), and four equivalent Sn(1) atoms to form a mixture of corner and face-sharing NiSm4Ni4Sn4 cuboctahedra. Sn(1) is bonded in a 8-coordinate geometry to two equivalent Sm(2), two equivalent Ni(2), and four equivalent Ni(1) atoms.
SmNi3Sn2 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. All Sm(1)-Ni(1) bond lengths are 3.07 Å. In the second Sm site, Sm(2) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Ni(2), and six equivalent Sn(1) atoms. All Sm(2)-Ni(1) bond lengths are 3.20 Å. All Sm(2)-Ni(2) bond lengths are 3.44 Å. All Sm(2)-Sn(1) bond lengths are 3.25 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), two equivalent Ni(2), and four equivalent Sn(1) atoms. Both Ni(1)-Ni(2) bond lengths are 2.63 Å. All Ni(1)-Sn(1) bond lengths are 2.60 Å. In the second Ni site, Ni(2) is bonded to four equivalent Sm(2), four equivalent Ni(1), and four equivalent Sn(1) atoms to form a mixture of corner and face-sharing NiSm4Ni4Sn4 cuboctahedra. All Ni(2)-Sn(1) bond lengths are 2.66 Å. Sn(1) is bonded in a 8-coordinate geometry to two equivalent Sm(2), two equivalent Ni(2), and four equivalent Ni(1) atoms.