SmNi3Sn2 crystallizes in the hexagonal P-62m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 18-coordinate geometry to three equivalent Ni(2), six equivalent Ni(1), three equivalent Sn(1), and six equivalent Sn(2) atoms. In the second Sm site, Sm(2) is bonded in a 12-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 10-coordinate geometry to one Sm(2), two equivalent Sm(1), one Ni(1), two equivalent Ni(2), two equivalent Sn(1), and two equivalent Sn(2) atoms. In the second Ni site, Ni(2) is bonded to two equivalent Sm(1), two equivalent Sm(2), four equivalent Ni(1), two equivalent Sn(1), and two equivalent Sn(2) atoms to form a mixture of distorted corner and face-sharing NiSm4Ni4Sn4 cuboctahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(2), and four equivalent Ni(1) atoms. In the second Sn site, Sn(2) is bonded in a 10-coordinate geometry to four equivalent Sm(1), two equivalent Ni(2), and four equivalent Ni(1) atoms.
SmNi3Sn2 crystallizes in the hexagonal P-62m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 18-coordinate geometry to three equivalent Ni(2), six equivalent Ni(1), three equivalent Sn(1), and six equivalent Sn(2) atoms. All Sm(1)-Ni(2) bond lengths are 3.31 Å. All Sm(1)-Ni(1) bond lengths are 3.20 Å. All Sm(1)-Sn(1) bond lengths are 3.53 Å. All Sm(1)-Sn(2) bond lengths are 3.45 Å. In the second Sm site, Sm(2) is bonded in a 12-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 3.02 Å. All Sm(2)-Ni(2) bond lengths are 3.48 Å. All Sm(2)-Sn(1) bond lengths are 3.20 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to one Sm(2), two equivalent Sm(1), one Ni(1), two equivalent Ni(2), two equivalent Sn(1), and two equivalent Sn(2) atoms. The Ni(1)-Ni(1) bond length is 2.69 Å. Both Ni(1)-Ni(2) bond lengths are 2.72 Å. Both Ni(1)-Sn(1) bond lengths are 2.54 Å. There is one shorter (2.51 Å) and one longer (2.62 Å) Ni(1)-Sn(2) bond length. In the second Ni site, Ni(2) is bonded to two equivalent Sm(1), two equivalent Sm(2), four equivalent Ni(1), two equivalent Sn(1), and two equivalent Sn(2) atoms to form a mixture of distorted corner and face-sharing NiSm4Ni4Sn4 cuboctahedra. Both Ni(2)-Sn(1) bond lengths are 2.59 Å. Both Ni(2)-Sn(2) bond lengths are 2.69 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), two equivalent Ni(2), and four equivalent Ni(1) atoms. In the second Sn site, Sn(2) is bonded in a 10-coordinate geometry to four equivalent Sm(1), two equivalent Ni(2), and four equivalent Ni(1) atoms.