Rh2O3 is Corundum-like structured and crystallizes in the orthorhombic Pbca space group. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to one O(3), two equivalent O(1), and three equivalent O(2) atoms to form a mixture of face, edge, and corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles range from 45-62°. In the second Rh site, Rh(2) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of face, edge, and corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Rh(1) and two equivalent Rh(2) atoms to form a mixture of distorted edge and corner-sharing ORh4 trigonal pyramids. In the second O site, O(2) is bonded to one Rh(2) and three equivalent Rh(1) atoms to form a mixture of distorted edge and corner-sharing ORh4 trigonal pyramids. In the third O site, O(3) is bonded to one Rh(1) and three equivalent Rh(2) atoms to form a mixture of distorted edge and corner-sharing ORh4 tetrahedra.
Rh2O3 is Corundum-like structured and crystallizes in the orthorhombic Pbca space group. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to one O(3), two equivalent O(1), and three equivalent O(2) atoms to form a mixture of face, edge, and corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles range from 45-62°. The Rh(1)-O(3) bond length is 2.05 Å. There is one shorter (2.01 Å) and one longer (2.07 Å) Rh(1)-O(1) bond length. There are two shorter (2.03 Å) and one longer (2.05 Å) Rh(1)-O(2) bond length. In the second Rh site, Rh(2) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of face, edge, and corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. The Rh(2)-O(2) bond length is 2.08 Å. There is one shorter (2.02 Å) and one longer (2.11 Å) Rh(2)-O(1) bond length. There are a spread of Rh(2)-O(3) bond distances ranging from 2.03-2.13 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Rh(1) and two equivalent Rh(2) atoms to form a mixture of distorted edge and corner-sharing ORh4 trigonal pyramids. In the second O site, O(2) is bonded to one Rh(2) and three equivalent Rh(1) atoms to form a mixture of distorted edge and corner-sharing ORh4 trigonal pyramids. In the third O site, O(3) is bonded to one Rh(1) and three equivalent Rh(2) atoms to form a mixture of distorted edge and corner-sharing ORh4 tetrahedra.