The Raman microprobe spectra of natural brookite crystals from Switzerland and Brazil and a synthetic brookite powder exhibit a characteristic intense band at 153 cm−1. In contrast, anatase has a band of similar intensity at 144 cm−1 and rutile lacks a strong band in this region. ...
A transition temperature of 550 °C has been found for nano-TiO2 to irreversibly transform from brookite to anatase by plotting the Raman peak shifts against the annealing temperatures. The W-H underestimation on the strain in the brookite phase gives W-H/Raman factor of 3.10 ± 0.05...
ofbrooklteandanatase,wasdividedintotwofeaturesbyfittingtechnique,whicharerelatedtothespectraofthemseparately.UV,VisspectrashowthattheUVabsorptionofthesuperfineanataseparticlesarebetterthanthatofbrookiteandrutile.Whilecommercialanatase(sized～2O"m)haseven1owerUVabsorptionthanthatofnanosizedbrookiteandrutileobtainedby...
However, the brookite phase TiO2 spectrum has many more bands than the middle spectrum, and the peak positions are not a good match (6). Therefore, we can reasonably conclude that the sample is primarily anatase TiO2 with some rutile TiO2 present. Figure 2: Raman spectrum obtained from a ...
Visspectra show thatthe UV absorption of the superfine anatase particles are better than thatof brookiteandrutile.W hilecommercialanatase (sized～ 2Om)haseven1ower UV absorption than thatofnanosized brookiteand rutile obtained by this 收蓓 日期 :1999一O4-07{咎破穑收到 日期;1999—05—3i 上海...
Nanosized TiO2 was prepared using the sol–gel procedure. The prepared powder was thermally treated up to 1000°C. X-ray diffraction (XRD) measurements showed that the starting powder and the samples obtained after heating this powder up to 500°C were mixtures of anatase, as the dominant ...
rutileanataseUV pulse laserRaman spectroscopyThe TiO_2 coatings were prepared by simple sol-gel method and modified by UV pulsed laser. TiO_2, also know as titania, is a ceramic compound, existing in numerous polymorphic forms, mainly as tetragonal rutile and anatase, and rhomboidal brookite. ...
Rezaee M, Khoie SMM, Liu KH (2011) The role of brookite in mechanical activation of anatase-to-rutile transformation of nanocrystalline TiO2: an XRD and Raman spectroscopy investigation. Cryst Eng Comm 13:5055-5061Rezaee M, Mousavi Khoie SM, Liu KH. The role of brookite in mechanical acti...
The TiO2 thin film spectrum is split into one spectrum for the amorphous phase and spectra for each crystalline phase (anatase, rutile, and brookite) being divided into first‐order scattering and a phase background (including second‐order scattering). Moreover, if the substrate is luminescent,...
The Raman spectroscopy method was used for structural characterization of TiO2 thin films prepared by atomic layer deposition (ALD) and pulsed laser deposition (PLD) on fused silica and single-crystal silicon and sapphire substrates. Using ALD, anatase thin films were grown on silica and silicon ...