Effect of grain size on structural transitions in anatase<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ti</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: A Raman spectroscopy study at high pressure

Hearne, G. R.; Zhao, Jianhua; Dawe, A. M.; Pischedda, V.; Maaza, M.; Nieuwoudt, Michél K.; Kibasomba, Pierre M.; Nemraoui, O.; Comins, J. D.; Witcomb, M. J.

doi:10.1103/physrevb.70.134102

Cited by 165 publications

(112 citation statements)

References 41 publications

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“…The phase transition of anatase nanotubes is similar to the pressure-induced amorphization of ultrafine anatase nanocrystals. [19][20][21] This means that the anatase structure transforms into an amorphous or highly disordered baddeleyite form upon compression. Upon decompression, several broad peaks are observed, which are different from those of the high pressure form (∼ 35.3 GPa).…”

Section: Methodsmentioning

confidence: 99%

“…High pressure provides a potential route for preparing nanostructured amorphous materials from the corresponding crystal nanomaterials by using their pressure-induced amorphization. TiO 2 nanomaterials show unique size-and morphology-dependent phase transition behaviors under high pressure, especially for their pressure-induced amorphization in ultrafine nanoparticles [19][20][21] and nanostructures. 13 This motivates us to study the phase transition behaviors and synthesize amorphous TiO 2 nanotubes under high pressure.…”

Section: Introductionmentioning

confidence: 99%

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High pressure synthesis of amorphous TiO2 nanotubes

Liu

Wang

et al. 2015

AIP Advances

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Amorphous TiO2 nanotubes with diameters of 8-10 nm and length of several nanometers were synthesized by high pressure treatment of anatase TiO2 nanotubes. The structural phase transitions of anatase TiO2 nanotubes were investigated by using in-situ high-pressure synchrotron X-ray diffraction (XRD) method. The starting anatase structure is stable up to ∼20GPa, and transforms into a high-density amorphous (HDA) form at higher pressure. Pressure-modified high- to low-density transition was observed in the amorphous form upon decompression. The pressure-induced amorphization and polyamorphism are in good agreement with the previous results in ultrafine TiO2 nanoparticles and nanoribbons. The relationship between the LDA form and α-PbO2 phase was revealed by high-resolution transmission electron microscopy (HRTEM) study. In addition, the bulk modulus (B0 = 158 GPa) of the anatase TiO2 nanotubes is smaller than those of the corresponding bulks and nanoparticles (180-240 GPa). We suggest that the unique open-ended nanotube morphology and nanosize play important roles in the high pressure phase transition of TiO2 nanotubes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High pressure synthesis of amorphous TiO2 nanotubes

Liu

Wang

et al. 2015

AIP Advances

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“…The transformation of polycrystalline anatase into TiO 2 -II was found at 2.6 GPa [24], 7 GPa [25] and 5 GPa [26]. The transformation of TiO 2 -II into the MI structure occurred at 10 GPa [26], 12 -15 GPa [26], and 13 -17 GPa [11]. A number of experimental studies [21,23,27] showed a transformation of nano-and fine-grained polycrystalline anatase into MI at pressures ≥ 13 GPa.…”

Section: Introductionmentioning

confidence: 99%

“…E. g., a decrease in crystallite size apparently stabilizes anatase up to higher pressures: Anatase single crystals transform into TiO 2 -II at 2.5 GPa [11] and 4.5 GPa [23]. The transformation of polycrystalline anatase into TiO 2 -II was found at 2.6 GPa [24], 7 GPa [25] and 5 GPa [26]. The transformation of TiO 2 -II into the MI structure occurred at 10 GPa [26], 12 -15 GPa [26], and 13 -17 GPa [11].…”

Section: Introductionmentioning

confidence: 99%

Compression Behavior of Zr-doped Nanoanatase

Holbig

Dubrovinsky

Steinle‐Neumann

et al. 2006

Zeitschrift Für Naturforschung B

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The compression behavior of Zr-doped nano anatase Ti 0.90 Zr 0.10 O 2 synthesized by the sol-gel method was studied using a diamond anvil cell (DAC) up to ∼ 13 GPa. The compressibility parallel to the a axis decreases strongly at ∼ 4 GPa and other structural parameters also change with pressure. The parameters of the third order Birch-Murnaghan equation of state were fitted to: V 0 = 139.6(0)Å 3 , K 0 = 213(9) GPa and K = 17.9(2). Ab initio electronic structure simulations indicate that the Zr atoms cluster in the crystal. The effects of chemical substitution as well as of microstructure, especially the crystallite size, on the mechanical properties are discussed.

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“…3. The position of peaks inherent to the vibrational modes of TiO 2 (TC model) coincide with vibrational modes for TiO 2 anatase modification ( Table 5) that were found using the group-theoretical analysis [30] and presented by Rigy [31]. The forms and spectral positions of vibrational modes for doped with metal and undoped TiO 2 nanotubes are close to each other (Fig.…”

Section: Raman Scatteringmentioning

confidence: 75%

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

Kulish¹

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Fe/TiO 2 , Mn/TiO 2 , Zn/TiO 2 , Cd/TiO 2 , Ni/TiO 2 titania nanotubes were synthesized by the method of direct hydrothermal synthesis. Their properties have been investigated using X-ray phase analysis and X-ray fluorescent analysis, high-resolution transmission electron microscopy, luminescent spectroscopy and Raman scattering. It has been ascertained that the Fe/TiO 2 , Mn/TiO 2 , Zn/TiO 2 , TiO 2 titania nanotubes possess the structure of Na 2 Ti 2 O 4 (OH) 2 . The structure of Cd/TiO 2 titania, probably, is mixture of anatase and rutile phases. We have found that Fe, Mn, Zn, Cd, Ni does not form solid solution with TiO 2 , and these metals are located in interlayer space. The mechanism of nanotube formation has been briefly discussed.

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Effect of grain size on structural transitions in anataseTiO2: A Raman spectroscopy study at high pressure

Cited by 165 publications

References 41 publications

High pressure synthesis of amorphous TiO2 nanotubes

High pressure synthesis of amorphous TiO2 nanotubes

Compression Behavior of Zr-doped Nanoanatase

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

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