Estimation of Phase Ratio for TiO2Powders by XRD and XAS

The crystallinity and phase ratio of anatase to rutile in TiO 2 were estimated by x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS).Traditionally, the structural characterization of TiO 2 powders has been carried out by XRD techniques, which are comparatively easy in use and analysis.However, materials with amorphous phase, nano-sized or nano-structured crystallinities cannot be fully characterized by XRD because XRD analysis has a limit for abnormal contributions of the nano-crystal such as the surface contribution.From the comparison with the experimental and calculated Ti K-edge XAS spectra, we found the possibility of efficient estimation in the crystalinites and the phase ratio of anatase to rutile for nano-sized TiO 2 mixture.