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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ir3Rh by Materials Project

Ir3Rh is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Ir sites. In the first Ir site, Ir is bonded to eight Ir and four equivalent Rh atoms to form IrIr8Rh4 cuboctahedra that share corners with twelve equivalent IrIr8Rh4 cuboctahedra, edges with eight equivalent RhIr12 cuboctahedra, edges with sixteen IrIr8Rh4 cuboctahedra, faces with four equivalent RhIr12 cuboctahedra, and faces with fourteen IrIr8Rh4 cuboctahedra. All Ir–Ir bond lengths are 2.74 Å. All Ir–Rh bond lengths are 2.74 Å. In the second Ir site, Ir is bonded to eight equivalent Ir and four equivalent Rh atoms to form IrIr8Rh4 cuboctahedra that share corners with four equivalent IrIr8Rh4 cuboctahedra, corners with eight equivalent RhIr12 cuboctahedra, edges with twenty-four IrIr8Rh4 cuboctahedra, faces with six equivalent RhIr12 cuboctahedra, and faces with twelve IrIr8Rh4 cuboctahedra. All Ir–Rh bond lengths are 2.74 Å. Rh is bonded to twelve Ir atoms to form RhIr12 cuboctahedra that share corners with four equivalent RhIr12 cuboctahedra, corners with eight equivalent IrIr8Rh4 cuboctahedra, edges with eight equivalent RhIr12 cuboctahedra, edges with sixteen equivalent IrIr8Rh4 cuboctahedra, faces with four equivalent RhIr12 cuboctahedra, and faces with fourteen IrIr8Rh4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

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.

36 MATERIALS SCIENCE↗