Niobium-titanium oxide powders obtained by laser-induced synthesis: Microstructure and structure evolution from diffraction data

Depero, Laura E.; Sangaletti, L.; Allieri, Brigida; Bontempi, Elza; Salari, R.; Zocchi, M.; Casale, C.; Notaro, M.

doi:10.1557/jmr.1998.0226

Cited by 59 publications

(31 citation statements)

References 29 publications

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“…3͒. The ratio between anatase and rutile extracted from XRD spectra was computed with the empirical relationship used by Depero et al 19 R͑T ͒ϭ0.679…”

Section: Resultsmentioning

confidence: 99%

“…12-14 The effect of Nb doping in titania and its importance for oxygen sensors has recently been highlighted by several articles, [15][16][17][18][19] indicating higher device sensitivity 20 at lower working temperatures. 21,22 Likewise, recent studies have shown the feasibility of using Nb/TiO 2 as surface conductance CO sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Although many articles mention the influence of Nb on strain, grain size evolution, and anatase-to-rutile transformation, as well as the consequences for sensing devices, 17,19,20,25,26 little systematic research has been carried out in this field. Therefore, our work provides useful data for the technological improvement of TiO 2 -based gas sensor devices, as well as for the scientific understanding of the anatase-to-rutile transformation and the role of Nb doping in these mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Arbiol

Cerdá

Dezanneau

et al. 2002

Journal of Applied Physics

313

184

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We study the influence of Nb doping on the TiO 2 anatase-to-rutile phase transition, using combined transmission electron microscopy, Raman spectroscopy, x-ray diffraction and selected area electron diffraction analysis. This approach enabled anatase-to-rutile phase transition hindering to be clearly observed for low Nb-doped TiO 2 samples. Moreover, there was clear grain growth inhibition in the samples containing Nb. The use of high resolution transmission electron microscopy with our samples provides an innovative perspective compared with previous research on this issue. Our analysis shows that niobium is segregated from the anatase structure before and during the phase transformation, leading to the formation of NbO nanoclusters on the surface of the TiO 2 rutile nanoparticles.

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“…3͒. The ratio between anatase and rutile extracted from XRD spectra was computed with the empirical relationship used by Depero et al 19 R͑T ͒ϭ0.679…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Arbiol

Cerdá

Dezanneau

et al. 2002

Journal of Applied Physics

313

184

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“…[31] The percentage of rutile is estimated as 93.1 and 52.4 % for Nb:TiO 2 -01 and Nb:TiO 2 -20 samples, respectively.…”

Section: Resultsmentioning

confidence: 96%

Improvement of Solar Energy Conversion with Nb‐Incorporated TiO₂ Hierarchical Microspheres

et al. 2013

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Niobium-modified TiO2 hierarchical spherical micrometer-size particles, which consist of many nanowires, are synthesized by solvothermal synthesis and studied as photoelectrodes for water photo-oxidation and dye-sensitized solar cell (DSSC) applications. Incorporation of Nb leads to a rutile-to-anatase TiO2 phase transition in the TiO2 hierarchical spheres (HSs), with the anatase percentage increasing from 0% for the pristine TiO2 HSs to 47.6% for the 1.82 at.% Nb-incorporated TiO2 sample. Incorporation of Nb leads to significant improvements in water photo-oxidation with the photocurrents reaching 70.5 μA cm(-2) at 1.23 V versus the reversible hydrogen electrode, compared with 28.3 μA cm(-2) for the pristine TiO2 sample. The photoconversion efficiency of Nb:TiO2 HS-based DSSCs reaches 6.09±0.15% at 0.25 at.% Nb, significantly higher than that for the pristine TiO2 HS cells (3.99±0.02%). In addition, the incident-photon-to-current efficiency spectra for DSSCs show that employing TiO2 and Nb:TiO2 HSs provides better light harvesting, especially of long-wavelength photons, than anatase TiO2 nanoparticle-based DSSCs.

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“…TiNb 2 O 7 can be synthesized by a variety of processes such as solid state synthesis [6], laser-induced pyrolysis [7], hydrothermal crystallization [8], and evaporation-induced self-assembly (EISA) [1].…”

Section: Introductionmentioning

confidence: 99%

Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction

Choi¹,

Ali²,

Choi³

et al. 2017

Archives of Metallurgy and Materials

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Although TiNb 2 O 7 is regarded as a material with high application potential in lithium-ion batteries (LIBs) and solid-oxide fuel cells (SOFCs), it has been difficult to find suitable cost-effective conditions for synthesizing it on a commercial scale. In this study, TiNb 2 O 7 compounds were synthesized by a solid state synthesis process. For stoichiometrically precise synthesis of the TiNb 2 O 7 phase, the starting materials, TiO 2 and Nb 2 O 5 were taken in a 1:1 molar ratio. Activation energy and reaction kinetics of the system were investigated at various synthesis temperatures (800,1000,1200, and 1400°C) and for various holding durations (1,5,10, and 20 h). Furthermore, change in the product morphology and particle size distribution were also evaluated as a function of synthesis temperature and duration. Additionally, quantitative phase analysis was conducted using the Rietveld refinement method. It was found that increases in the synthesis temperature and holding time lead to increase in the mean particle size from 1 to 4.5 μm. The reaction rate constant for the synthesis reaction was also calculated.

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Niobium-titanium oxide powders obtained by laser-induced synthesis: Microstructure and structure evolution from diffraction data

Cited by 59 publications

References 29 publications

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Improvement of Solar Energy Conversion with Nb‐Incorporated TiO₂ Hierarchical Microspheres

Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction

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Niobium-titanium oxide powders obtained by laser-induced synthesis: Microstructure and structure evolution from diffraction data

Cited by 59 publications

References 29 publications

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Improvement of Solar Energy Conversion with Nb‐Incorporated TiO2 Hierarchical Microspheres

Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction

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Product

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Improvement of Solar Energy Conversion with Nb‐Incorporated TiO₂ Hierarchical Microspheres