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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on AlCrO3 by Materials Project

CrAlO3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cr3+ is bonded to five O2- atoms to form CrO5 trigonal bipyramids that share corners with six equivalent AlO6 octahedra and corners with six equivalent CrO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 64°. There is three shorter (1.84 Å) and two longer (2.04 Å) Cr–O bond length. Al3+ is bonded to six equivalent O2- atoms to form distorted AlO6 octahedra that share corners with six equivalent CrO5 trigonal bipyramids and edges with six equivalent AlO6 octahedra. All Al–O bond lengths are 2.04 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Cr3+ atoms. In the second O2- site, O2- is bonded to one Cr3+ and three equivalent Al3+ atoms to form a mixture of corner and edge-sharing OAl3Cr tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCrO3 by Materials Project

CrAlO3 is (Cubic) Perovskite structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six equivalent CrO6 octahedra and faces with eight equivalent AlO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. There is two shorter (1.86 Å) and four longer (1.91 Å) Cr–O bond length. Al3+ is bonded to twelve O2- atoms to form distorted AlO12 cuboctahedra that share corners with twelve equivalent AlO12 cuboctahedra, faces with six equivalent AlO12 cuboctahedra, and faces with eight equivalent CrO6 octahedra. There are eight shorter (2.67 Å) and four longer (2.71 Å) Al–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Cr3+ and four equivalent Al3+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Cr3+ and four equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗