Cr2O5 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing CrO4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-52°. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra and corners with four equivalent Cr(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Cr(2) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom.
Cr2O5 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing CrO4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-52°. The Cr(1)-O(1) bond length is 1.67 Å. The Cr(1)-O(2) bond length is 1.67 Å. The Cr(1)-O(3) bond length is 1.66 Å. The Cr(1)-O(5) bond length is 1.67 Å. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra and corners with four equivalent Cr(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. The Cr(2)-O(1) bond length is 2.01 Å. The Cr(2)-O(2) bond length is 2.00 Å. The Cr(2)-O(3) bond length is 2.04 Å. The Cr(2)-O(5) bond length is 1.99 Å. There is one shorter (1.79 Å) and one longer (1.87 Å) Cr(2)-O(4) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Cr(2) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom.