Preparation and Optical Storage Properties of λ­Ti3O5 Powder

The Ti3O5 powder was prepared by reducing TiO2 nanopartical in H2 atmosphere. The samples were inves- tigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscope (FTIR), scanning electron micro- scope (SEM) and UV-Vis diffusion reflectance spectra (UV-Vis). The results show that, single phase Ti3O5 can be ob- tained by increasing the H2 flow. When H2 flow increases from 0.3 mL/min to 0.8 mL/min, the single phase λ-Ti3O5 can be synthesized using SiO2-coated TiO2 (rutile, nanoparticle) as raw material at 1150℃ for 1 h. While using nano-TiO2 powders without SiO2-coated as raw material, the reduction product is multiphases composed of λ-Ti3O5 and β-Ti3O5. There is a high reflectivity contrast between λ-Ti3O5 and β-Ti3O5. When the multiphases sample is irradi- ated with 532 nm 20 ns-pulsed laser light at room temperature, Ti3O5 will transit from α phase to β phase, which shows a good optical storage performance.