Cr2O3 is Corundum-like structured and crystallizes in the trigonal R-3 space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to six equivalent O(1) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles are 42°. In the second Cr site, Cr(2) is bonded to six equivalent O(1) atoms to form a mixture of edge, corner, and face-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles are 53°. In the third Cr site, Cr(3) is bonded to six equivalent O(1) atoms to form a mixture of corner and face-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 42-53°. O(1) is bonded to one Cr(1), one Cr(3), and two equivalent Cr(2) atoms to form a mixture of edge and corner-sharing OCr4 trigonal pyramids.
Cr2O3 is Corundum-like structured and crystallizes in the trigonal R-3 space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to six equivalent O(1) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles are 42°. All Cr(1)-O(1) bond lengths are 2.00 Å. In the second Cr site, Cr(2) is bonded to six equivalent O(1) atoms to form a mixture of edge, corner, and face-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are three shorter (1.97 Å) and three longer (2.02 Å) Cr(2)-O(1) bond lengths. In the third Cr site, Cr(3) is bonded to six equivalent O(1) atoms to form a mixture of corner and face-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 42-53°. All Cr(3)-O(1) bond lengths are 2.01 Å. O(1) is bonded to one Cr(1), one Cr(3), and two equivalent Cr(2) atoms to form a mixture of edge and corner-sharing OCr4 trigonal pyramids.