Probing the Local Environment of Ti³⁺ Ions in TiO₂ (Rutile) by ¹⁷O HYSCORE

Abstract

Reduced states in TiO(2) : (17)O hyperfine sublevel correlation spectroscopy was used to monitor the local environment of stable Ti(3+) ions generated in a (17)O-enriched polycrystalline TiO(2) (rutile) sample. A hyperfine interaction of about 8 MHz is found, which is analogous to that observed for molecular Ti(3+) aqua complex cations and suggests a localized nature of the unpaired electron wave function for these centers at 4 K.

Cyan titania nanowires: Spectroscopic study of the origin of the self-doping enhanced photocatalytic activity

“…The EPR signal of the surface states almost vanishes above 150 K. We associate the disappearance of the EPR signals at higher temperatures with the recombination of the electron-hole pairs due to diffusion [73,74]. Similarly, Livraghi et al [75] found that the bulk Ti 3+…”

Ferromagnetic Interactions in Highly Stable, Partially Reduced TiO2: The S=2 State in Anatase

“…The blue or black color of the modified TiO 2 is associated with the presence of excess electrons in the TiO 2 structure . When excess electrons are generated in TiO 2 they are usually stabilized, with different degrees of localization, at Ti sites, forming Ti 3+ units . Ti 3+ ions with 3d 1 electronic configuration may be regarded as “spin‐bearing units” isolated in the diamagnetic TiO 2 host matrix.…”

Nb-doped Ti2O3 Films Deposited Through Grid-Assisted Magnetron Sputtering on Glass Substrate: Electrical and Optical Analysis

“…However, from 500 nm to about 1000 nm, an increase in the absorption coefficient is registered, as seen in Figure 4, which can be correlated with the presence of oxygen vacancies. This absorption band is attributed to Ti 3+ -Ti 4+ charge-transfer 37,38 and is also an additional confirmation of the presence of titanium ions in the Ti 3+ oxidation state. Figure 5 shows the refractive index results as a function of wavelength for the produced Ti 2 O 3 :Nb films.…”