Raman study of phase transformation of TiO2 rutile single …

High pressure X-ray diffraction [10], [11], [12] and Raman spectroscopy [13], [14] studies have revealed that rutile and anatase transform to a columbite structure at high pressure. Recently phase of TiO 2 from anatase to rutile is studied by UV Raman spectroscopy excited by 325 and 244 nm lasers [15]. High fluence neutron irradiation and ...

Anatase vs. Rutile — What's the Difference?

Key Differences. Anatase and rutile are crystalline forms of titanium dioxide, differing primarily in structure and physical properties. Anatase has a tetragonal structure, making it less dense and providing a higher surface area, beneficial for photocatalytic activities. Rutile, with its more compact tetragonal structure, is denser and ...

Rutile‐to‐anatase reverse phase transformation …

This report is on the reverse phase transformation of TiO 2 from rutile to anatase in a highly alkaline medium at relatively low temperature (<250°C) via a simple hydrothermal approach. A reverse …

Titanium Dioxide (Anatase and Rutile): Surface Chemistry, …

Controlled Phase Transformation and Crystal Growth of Titanium Dioxide from Anatase/Silica Core/Shell Particles. Inorganic Chemistry 2023, 62 (30), 12166-12174.

Anatase : Properties, Formation, Uses » Geology Science

Anatase is one of the three primary mineral forms of titanium dioxide (TiO2), the other two being rutile and brookite. It is a tetragonal mineral and a polymorph of TiO2, meaning that it shares the same chemical composition with rutile but has a different crystal structure. Anatase is named after the Greek word "anatasis," which means extension, in …

Synthesis of anatase and rutile mixed phase titanium …

The anatase and rutile planes of TiO 2 nanoparticles made with 0.6 M of Ti precursors exhibit the same XRD peak intensity. This can be attributed to TiO 2 crystal phase transformation from rutile to anatase with increase in titanium precursor. Anatase is more stable at low temperature and transfers to rutile phase at high temperature.

Review of the Anatase to Rutile Phase Transformation

Abstract and Figures. Titanium dioxide, TiO2, is an important photocatalytic material that exists as two main polymorphs, anatase and rutile. The presence of either or both of these phases impacts ...

Review of the anatase to rutile phase transformation

Anatase to rutile phase transformation is initiated at low temperature under the influence of pre-existing rutile. The materialization and amalgamation of …

(PDF) Study of the anatase to rutile transformation kinetics of the

The apparent activation energy of anatase to rutile transformation and the average size of titanium dioxide crystallites were determined for the unmodifi ed TiO2 and TiO2 modifi ed with P, K, Al ...

In situ TEM investigation of the oxide/metal interface during …

This phase transformation—known as the anatase-to-rutile transformation (ART)—has been reported to occur over a wide range of temperatures from 400 to 1000°C [11, 31, 32]. Previous studies have established that the ART in NTs is limited when annealing is carried out in a reducing atmosphere, as these annealing conditions …

Anatase–rutile phase transformation of titanium dioxide bulk …

The anatase–rutile phase transformation of TiO 2 bulk material is investigated using a density functional theory (DFT) approach in this study. According to the calculations employing the Perdew–Burke–Ernzerhof (PBE) exchange–correlation functional with the Vanderbilt ultrasoft pseudopotential, it is suggested that the anatase phase is …

Anatase‐to‐Rutile Transformation in Titania Powders

The anatase to rutile transformation is influenced by the factors such as heating temperature, heating time and the states of particles of anatase TiO2. In the calcination of metatitanic acid, the ...

Review of the anatase to rutile phase transformation

the anatase to rutile transformation, and the principles of controlling phase composition through the inhibition or promotion of the transformation of anatase to rutile. Titania polymorphs Titanium dioxide, the only naturally occurring oxide of titanium at atmospheric pressure, exhibits three poly-morphs: rutile, anatase, and brookite [1–7].

Silicon impurity release and surface transformation of TiO2 anatase …

The XRD data and TEM images show that crystallinity and morphology for the 5, 10 nm anatase and 10 × 40 nm rutile were in accordance with the nominal parameters reported by the vendor (Liu et al., 2011).However, the 30 × 40 nm "rutile" comprised a mixture of both anatase and rutile, while the 50 nm TiO 2 was mainly anatase rather …

Influence of calcination temperature on anatase to rutile …

@article{Wetchakun2012InfluenceOC, title={Influence of calcination temperature on anatase to rutile phase transformation in TiO2 nanoparticles synthesized by the modified sol–gel method}, author={Natda Wetchakun and Burapat Incessungvorn and Khatcharin Wetchakun and Sukon Phanichphant}, journal={Materials Letters}, …

Formation of rutile nuclei at anatase {112} twin interfaces …

Subsequent transformation of bulk anatase involves rupture of 7 of the 24 Ti-O bonds per unit cell and cooperative displacement of Ti and O. As the transformation advances into the bulk material, adjacent slabs of anatase octahedra are destabilized, resulting in rapid progression of the transformation of bulk anatase to rutile.

Engineering of anatase/rutile TiO2 heterophase junction via …

In this work, an anatase/rutile-TiO 2 (AR-TiO 2) heterophase junction with appropriate carbon content was successfully fabricated via an in-situ phase transformation process. The phase transformation started from the inner core of the nanoparticles and the area of phase interface between anatase and rutile was carefully controlled by …

Spectroscopic Investigation of the Anatase-to-Rutile Transformation …

However, some researchers reported the temperature range for the transformation of amorphous TiO 2 to anatase as 500-800 • C [20] and for the anatase-to-rutile transformation as 570-900 • C ...

Heating-Induced Transformation of Anatase TiO

Anatase TiO2 nanocrystals (NCs) play a vital role in photocatalytic applications due to their high catalytic activity and in gas-sensing applications due to their high chemical sensitivity. Here, we report the transformation at elevated temperature of anatase nanorods (NRs) with a length of 25 nm into rock-salt TiO nanoparticles with an …

Understanding the surface reduction of nano rutile and anatase …

Which has a higher surface reduction activity between anatase and rutile? The answer remains unknown so far in the literature. Anatase is metastable to transform irreversibly to rutile at elevated temperatures. [[18], [19], [20]] Structurally, both anatase and rutile are constructed from distorted [TiO 6] octahedral structure unit. [21]

Parametric crystalline characterization of Anatase/Rutile …

In this study, a structural characterization parametrization for atomic feature detection was utilized to study Anatase–Rutile polymorphs of Titania and Anatase phase transformation to Rutile. The MD simulation elucidated that visible transformation is detected between 900 and 1200 K, which corresponds well to experimental results at …

Spectroscopic Investigation of the Anatase-to-Rutile Transformation …

Among the three major phases in titania, anatase is reported to be a better photocatalytically active phase. Anatase to rutile transformations, under normal conditions, usually occurs at a temperatue range of 600−700 °C. Various chemical additives have previously been employed to extend the anatase transition to higher temperatures. …

New approach of modifying the anatase to rutile transition temperature

In pure synthetic titanium dioxide, the anatase to rutile phase transition usually occurs between the temperatures of 600 °C and 700 °C. The phase transition temperature can be altered by various methods, including modifying the precursor or by adding dopant or modifier to the TiO 2 sample. In an attempt to investigate the phase …

Amorphous-to-crystalline transition of thin-film TiO

TiO 2 is an important material that finds application as a catalyst, photocatalyst, electrode, antibacterial agent, and gas sensor [1, 2].The three most common polymorphs, rutile, anatase, and brookite, have different properties. For example, anatase is most commonly used as a catalyst [], but rutile is known as the ground state form [], …

Phase evolution, morphological, optical and …

In this paper, we report anatase and rutile titanium oxide (TiO 2) nanoparticulate thin films fabricated on silica and Indium Tin Oxide (ITO) substrates using femtosecond pulsed laser...

The effect of tin dioxide (SnO2) on the anatase-rutile phase

In other words, phase transformation between anatase and rutile, and their ratio in titania layers have a significant influence on the pearlescent appearance of mica-titania pigments [9]. Furthermore, rutile is known to have a lower photocatalytic activity than anatase, implying that rutile transformation is more desirable to achieve prevention ...

The critical size mechanism for the anatase to rutile transformation in

A critical particle size mechanism for anatase to rutile transformation occurs because the surface free energy of anatase is lower than that of rutile—the reverse of the bulk situation. 26 An R c value of 450 Å was measured here and, of the materials prepared, only those containing silica dopants and very high zirconia loadings showed an ...