Sm is alpha Samarium structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to six equivalent Sm(1) and six equivalent Sm(2) atoms to form a mixture of edge, corner, and face-sharing SmSm12 cuboctahedra. In the second Sm site, Sm(2) is bonded to three equivalent Sm(1) and nine equivalent Sm(2) atoms to form a mixture of edge, corner, and face-sharing SmSm12 cuboctahedra.
Sm is alpha Samarium structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to six equivalent Sm(1) and six equivalent Sm(2) atoms to form a mixture of edge, corner, and face-sharing SmSm12 cuboctahedra. All Sm(1)-Sm(1) bond lengths are 3.66 Å. All Sm(1)-Sm(2) bond lengths are 3.60 Å. In the second Sm site, Sm(2) is bonded to three equivalent Sm(1) and nine equivalent Sm(2) atoms to form a mixture of edge, corner, and face-sharing SmSm12 cuboctahedra. There are three shorter (3.62 Å) and six longer (3.66 Å) Sm(2)-Sm(2) bond lengths.