Kinetics and Mechanisms of Phase Transformations Induced by Ball-Milling in Anatase TiO2

Bégin‐Colin, Sylvie; Girot, T.; Caër, G. Le; Mocellin, A.

doi:10.1006/jssc.1999.8491

Cited by 123 publications

(70 citation statements)

References 31 publications

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“…The occurrence of the high-pressure TiO 2 II phase during the milling of crystalline H 2 Ti 3 O 7 or titanate nanotubes was not observed by the experimental techniques employed in this work, although this phase normally occurs during the milling of anatase [40,[49][50][51][52][53]. This is surprising, since in this work we employed exactly the same milling conditions as in our earlier ball-milling experiments performed with anatase TiO 2 [40], in which the appearance of the TiO 2 II phase was already clearly observed.…”

Section: Discussionmentioning

confidence: 70%

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The mechanochemical stability of hydrogen titanate nanostructures

Plodinec¹,

Friščić²,

Iveković³

et al. 2010

Journal of Alloys and Compounds

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The structural stability of some nanostructured titanates was investigated in terms of their subsequent processing and possible applications. With the aim to investigate their mechanochemical stability, we applied high-energy ball milling and studied the resulting induced phase transitions. Hydrogen titanates with two different morphologies, microcrystals and nanotubes, were taken into consideration. The phase-transition sequence was studied by Raman spectroscopy and X-ray powder diffraction, while the morphology and crystal structure, on the nanoscale, were analyzed by high-resolution transmission electron microscopy. During the mechanochemical treatment of both morphologies, the phase transitions from hydrogen titanate to TiO2 anatase and subsequently to TiO2 rutile were observed. In the case of hydrogen trititanate crystals, the phase transition to anatase starts after a longer milling time than in the case of the titanate nanotubes, which is explained by the larger particle size of the crystalline powder. However, the phase transition from anatase to rutile occurred more quickly in the crystalline powder than in the case of the nanotubes.

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Section: Discussionmentioning

confidence: 70%

“…The high-energy mechanochemical treatment of TiO 2 , for example, has been investigated in detail [40,[49][50][51][52][53], where it was shown that high-energy ball milling can be used to induce a phase transition from anatase TiO 2 to the high-pressure TiO 2 II phase. Prolonged ball milling then transformed the TiO 2 II to rutile TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

The mechanochemical stability of hydrogen titanate nanostructures

Plodinec¹,

Friščić²,

Iveković³

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

show abstract

“…The influence of milling on the phase transformation of titania with and without dopants has been widely investigated [141][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156] because of the industrial interest in this material as a photocatalyst. It has been generally reported that the anatase -rutile transformation takes place through the intermediate formation of a non-equilibrium high-pressure phase.…”

Section: Oxidic Compoundsmentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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“…20 Therefore, the brookite phase, which is a metastable phase at ambient pressure and exists at equilibrium only at high pressures, might be formed during milling conditions. 21 The presence of this phase in as-milled samples seems to be rational due to the large amount of root mean square (RMS) microstrain imposed on the powders during milling.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

“…21 According to the relative phase content in the as-milled samples (Table 1), mechanical activation of phase transformation at ambient temperature is a valid argument. According to Table 1, it is proposed that brookite is an essential part of the mechanically activated phase transformation in TiO 2 .…”

Section: This Journal Is ª the Royal Society Of Chemistry 2011mentioning

confidence: 99%

The role of brookite in mechanical activation of anatase-to-rutile transformation of nanocrystalline TiO2: An XRD and Raman spectroscopy investigation

2011

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The mechanism of phase transformation in nanocrystalline TiO 2 powders at ambient temperature during high energy ball milling and the role of brookite phase in anatase-to-rutile phase transformation were investigated by the use of Rietveld analysis of X-ray diffraction patterns and Raman spectroscopy methods. The milling process was performed on a fully anatase phase nanocrystalline TiO 2 powder via a high energy planetary ball mill with different ball-to-powder weight ratios followed by annealing of the as-milled samples. Some transformation from anatase-to-brookite was observed in all as-milled powders by high resolution transmission electron microscopy. It was proposed that brookite occurs at the {112} twin surfaces of anatase phase and therefore promotes anatase-to-rutile phase transformation. Based on the XRD and Raman results, it was proposed that brookite appears as an essential intermediate phase in mechanically induced anatase-to-rutile phase transformation which facilitates the phase transformation at ambient temperatures and also at higher temperatures during the post-annealing step.

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Kinetics and Mechanisms of Phase Transformations Induced by Ball-Milling in Anatase TiO2

Cited by 123 publications

References 31 publications

The mechanochemical stability of hydrogen titanate nanostructures

The mechanochemical stability of hydrogen titanate nanostructures

Hallmarks of mechanochemistry: from nanoparticles to technology

The role of brookite in mechanical activation of anatase-to-rutile transformation of nanocrystalline TiO2: An XRD and Raman spectroscopy investigation

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