Materials Data on AlRhO3 by Materials Project

Abstract

RhAlO3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Rh3+ is bonded to six equivalent O2- atoms to form RhO6 octahedra that share corners with six equivalent AlO5 trigonal bipyramids and edges with six equivalent RhO6 octahedra. All Rh–O bond lengths are 2.09 Å. Al3+ is bonded to five O2- atoms to form AlO5 trigonal bipyramids that share corners with six equivalent RhO6 octahedra and corners with six equivalent AlO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 61°. There is three shorter (1.82 Å) and two longer (1.95 Å) Al–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Rh3+ and one Al3+ atom to form a mixture of distorted edge and corner-sharing OAlRh3 tetrahedra. In the second O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Al3+ atoms.