The nature of the surface of pyrogenic titanium dioxide according to the optical spectroscopy data

The coordination state of titanium atoms on the surface of P25 two-phase pyrogenic titanium dioxide (Degussa) was studied by electron diffuse reflectance spectroscopy. Various methods for processing the complex electronic diffuse reflectance spectrum were considered, and two variants that could be used to obtain both qualitative and quantitative characteristics of titanium-oxygen polyhedra were suggested. Coordination structures characteristic of anatase and rutile were simultaneously present on the surface of P25. The ratio between them (54: 46) substantially differed from that determined by X-ray diffraction.