Materials Data on IrRh by Materials Project

IrRh is alpha La-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are three inequivalent Ir sites. In the first Ir site, Ir is bonded to six equivalent Ir and six equivalent Rh atoms to form IrIr6Rh6 cuboctahedra that share corners with twelve IrIr6Rh6 cuboctahedra, edges with twelve IrIr6Rh6 cuboctahedra, edges with twelve equivalent RhIr6Rh6 cuboctahedra, faces with six equivalent IrIr6Rh6 cuboctahedra, and faces with twelve equivalent RhIr6Rh6 cuboctahedra. All Ir–Ir bond lengths are 2.73 Å. All Ir–Rh bond lengths are 2.73 Å. In the second Ir site, Ir is bonded to six equivalent Ir and six Rh atoms to form IrIr6Rh6 cuboctahedra that share corners with five equivalent RhIr6Rh10 cuboctahedra, corners with twelve IrIr6Rh6 cuboctahedra, edges with ten RhIr6Rh6 cuboctahedra, edges with twelve IrIr6Rh6 cuboctahedra, faces with six equivalent IrIr6Rh6 cuboctahedra, and faces with fifteen RhIr6Rh6 cuboctahedra. All Ir–Ir bond lengths are 2.73 Å. All Ir–Rh bond lengths are 2.73 Å. In the third Ir site, Ir is bonded to six equivalent Ir and six Rh atoms to form IrIr6Rh6 cuboctahedra that share corners with five equivalent RhIr6Rh10 cuboctahedra, corners with twelve IrIr6Rh6 cuboctahedra, edges with ten RhIr6Rh6 cuboctahedra, edges with twelve IrIr6Rh6 cuboctahedra, faces with six equivalent IrIr6Rh6 cuboctahedra, and faces with fifteen RhIr6Rh6 cuboctahedra. All Ir–Ir bond lengths are 2.73 Å. All Ir–Rh bond lengths are 2.73 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded to six Ir and six equivalent Rh atoms to form RhIr6Rh6 cuboctahedra that share corners with twelve RhIr6Rh6 cuboctahedra, edges with twelve IrIr6Rh6 cuboctahedra, edges with twelve RhIr6Rh6 cuboctahedra, faces with six equivalent RhIr6Rh6 cuboctahedra, and faces with twelve IrIr6Rh6 cuboctahedra. All Rh–Rh bond lengths are 2.73 Å. In the second Rh site, Rh is bonded to six Ir and ten equivalent Rh atoms to form RhIr6Rh10 cuboctahedra that share corners with ten IrIr6Rh6 cuboctahedra, corners with twelve RhIr6Rh6 cuboctahedra, edges with eight IrIr6Rh6 cuboctahedra, edges with sixteen RhIr6Rh6 cuboctahedra, faces with sixteen equivalent RhIr6Rh10 cuboctahedra, and faces with eighteen IrIr6Rh6 cuboctahedra. There are a spread of Rh–Rh bond distances ranging from 2.73–5.46 Å.