Materials Data on SmRh3 by Materials Project

SmRh3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 12-coordinate geometry to twelve Rh atoms. There are a spread of Sm–Rh bond distances ranging from 3.05–3.35 Å. In the second Sm site, Sm is bonded in a distorted hexagonal planar geometry to eighteen Rh atoms. There are six shorter (3.07 Å) and twelve longer (3.43 Å) Sm–Rh bond lengths. There are four inequivalent Rh sites. In the first Rh site, Rh is bonded to five Sm and seven Rh atoms to form a mixture of distorted corner, edge, and face-sharing RhSm5Rh7 cuboctahedra. There are a spread of Rh–Rh bond distances ranging from 2.65–2.72 Å. In the second Rh site, Rh is bonded in a 12-coordinate geometry to three equivalent Sm and six equivalent Rh atoms. In the third Rh site, Rh is bonded in a 12-coordinate geometry to three equivalent Sm and six equivalent Rh atoms. In the fourth Rh site, Rh is bonded to six equivalent Sm and six equivalent Rh atoms to form RhSm6Rh6 cuboctahedra that share corners with twelve equivalent RhSm5Rh7 cuboctahedra, edges with six equivalent RhSm6Rh6 cuboctahedra, and faces with eighteen equivalent RhSm5Rh7 cuboctahedra.