Ni2O3 crystallizes in the monoclinic Cc space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing NiO4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing NiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ni(2) and two equivalent Ni(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Ni(1) and two equivalent Ni(2) atoms. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ni(1) and one Ni(2) atom.
Ni2O3 crystallizes in the monoclinic Cc space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing NiO4 tetrahedra. The Ni(1)-O(2) bond length is 1.90 Å. The Ni(1)-O(3) bond length is 1.80 Å. There is one shorter (1.87 Å) and one longer (1.88 Å) Ni(1)-O(1) bond length. In the second Ni site, Ni(2) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing NiO4 tetrahedra. The Ni(2)-O(1) bond length is 1.88 Å. The Ni(2)-O(3) bond length is 1.82 Å. There is one shorter (1.88 Å) and one longer (1.89 Å) Ni(2)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ni(2) and two equivalent Ni(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Ni(1) and two equivalent Ni(2) atoms. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ni(1) and one Ni(2) atom.