Titanium oxide (Ti3O5) is a metal oxide that is used in a wide range of applications such as optical lens coatings, semiconductor devices and solar cells. Titanium oxide can be prepared by laser ablation or electrochemical impedance spectroscopy (EIS). It is also a pigment, commonly found in paints, plastics and paper.

Ti?O? crystallises in the orthorhombic Cmcm space group.Ti3? bonds with six O2 atoms to form a mixture of twisted edges and co-angled TiO? octahedra. The tilting angles of the split-angle octahedra range from 31-54°. Ti?? bonds with six O2 atoms in a 6-coordinate geometry. the distances of the Ti-O bonding range from 1.93 to 2.16 ?. At the first O2- site, the O2- bonds are formed with two equivalent Ti3? atoms and two equivalent Ti3? atoms. Ti?? atoms, forming a mixture of twisted edges and co-angled OTi? trigonal pyramids. At the second O2- site, O2- is bonded to one Ti?? atom and two equivalent Ti3? atoms in a twisted T-shaped geometry. At the third O2- site, O2- is bonded to a Ti?? atom and three equivalent Ti3? atoms to form a hybrid twisted edge-shared OTi? trigonal pyramid.