In-situ Raman spectroscopy of BaTiO3 particles for tetragonal–cubic transformation

Hayashi, Hiromichi; Nakamura, Takashi; Ebina, Takeo

doi:10.1016/j.jpcs.2013.02.010

Cited by 127 publications

(77 citation statements)

References 37 publications

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“…According to literature [49,50] [51]. These results support the conclusion obtained from the XRD data (Fig.1b), and confirm that copper is introduced into the perovskite structure of the sol-gel catalyst.…”

Section: Iii1 Structural Characterization By Xrd and Raman Spectroscsupporting

confidence: 90%

“…As it was previously reported [37], by comparing the FWHM of the (2 0 0) and (1 1 1) XRD peaks, it is possible to determine if a perovskite presents a cubic or a tetragonal structure based on the (2 0 0)/(1 1 1) FWHM ratio. (This value is higher than 1 for a tetragonal perovskite structure due to the (0 0 2) peak of the tetragonal structure can appear overlapped with the (2 0 0) peak [48,49].) In Table 2 it is observed that the FWHM (2 0 0)/(1 1 1) ratio is higher than 1 for all selected catalysts, so, it could be concluded that tetragonal perovskite structure is adopted using the two synthesis methods.…”

Section: Iii1 Structural Characterization By Xrd and Raman Spectroscmentioning

confidence: 88%

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Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

Albaladejo-Fuentes

López-Suárez

Sánchez-Adsuar

et al. 2016

Applied Catalysis A: General

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Highlights-BaTiO3 and BaTi0.8Cu0.2O3 perovskites were synthesized using sol-gel and hydrothermal methods.-The location of copper in the catalyst depends on the synthesis method.-Cu-BTOsg, with Cu incorporated into the structure, presents a high NOx storage capacity.-Cu-BBOH, with CuO highly dispersed on the surface, shows a high activity for NO to NO2 oxidation. This is a previous version of the article published in Applied Catalysis A: General. 2016General. , 519: 7-15. doi:10.1016General. /j.apcata.2016 2 AbstractThe effect of the synthesis method (hydrothermal and sol-gel) on the properties of BaTi0.8Cu0.2O3 perovskites as catalysts for NOx and soot removal has been analyzed. X-ray powder diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), ICP-AES, N2 adsorption at -196ºC, Raman spectroscopy, Field Emission Scanning Electron Microscopy (FESEM) and temperature programmed reduction with hydrogen (H2-TPR) have been used for catalysts characterization.To test their catalytic activity, NOx storage and soot combustion temperature programmed reaction tests have been carried out.The results allow to conclude that the synthesis method determines the position of copper on the perovskite structure and, therefore, the catalytic applications. When the hydrothermal method is used the copper is highly dispersed on the perovskite surface, obtaining a catalyst with a high activity for the NO to NO2 oxidation reaction, which can be used as oxidation catalyst for soot removal. Nevertheless, using the sol-gel method, copper is incorporated into the perovskite structure and, consequently, the catalyst presents a high NOx storage capacity

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Section: Iii1 Structural Characterization By Xrd and Raman Spectroscsupporting

confidence: 90%

Section: Iii1 Structural Characterization By Xrd and Raman Spectroscmentioning

confidence: 88%

Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

Albaladejo-Fuentes

López-Suárez

Sánchez-Adsuar

et al. 2016

Applied Catalysis A: General

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“…Figure 7 presents the Raman spectra for 25 : 2 and 30 : 2 (CW : BT ratio) samples, both calcined at 1100°C. Both samples showed similar spectra consistent with those reported in the literature for BaTiO 3 crystals produced by a solid-state method [39]. The dominant tetragonal phase is confirmed by the presence of a sharp and distinct peak at 303 cm −1 assigned to E(TO) mode, which indicates asymmetry within the TiO 6 Journal of Nanomaterials on a local scale [40].…”

Section: Resultssupporting

confidence: 86%

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

Gomes

Magalhães

Paschoal

et al. 2018

Journal of Nanomaterials

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BaTiO 3 nanoparticles were successfully synthesized by a new coconut water-based sol-gel method using Ba(CH 3 COO) 2 and TiCl 3 as the starting salts. The influence of the amount of coconut water and calcination conditions on the barium titanate crystallization was investigated. The resulting nanoparticles were characterized by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies. The ferroelectric tetragonal single phase of BaTiO 3 was obtained in samples prepared with a ratio of coconut water volume (mL)/BaTiO 3 mass (g) of 25 : 2 and 30 : 2, calcined at 1100°C, which was confirmed by XRD measurements. Crystallites with an average size of about 31 nm for both samples were obtained, and microscopy images revealed the presence of particles in the range of 40 to 60 nm. Raman and FTIR spectra confirmed the dominant tetragonal phase of BaTiO 3 , meanwhile traces of BaCO 3 were identified in FTIR spectra.

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“…45,2º; 51,0 º; 56,1º; 65,8º; 74,9º; for (100), (110), (111), (200), (210), (211), (220) and (310) lattice planes, respectively [42].…”

Section: Textural and Structural Characterizationmentioning

confidence: 99%

“…and BaTiCu3 catalysts (Figure 1b) Hakuta et al [42,45] proposed that by comparing the FWHM of (200) and (111) XRD peaks (Figure 1b), it is possible to determine if a perovskite presents a cubic or a tetragonal structure.…”

mentioning

confidence: 99%

BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

Albaladejo-Fuentes

López-Suárez

Sánchez-Adsuar

et al. 2014

Applied Catalysis A: General

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Please cite this article as: V. Albaladejo-Fuentes, F.E. López-Suárez, M.S. Sánchez-Adsuar, M.J. Illán-Gómez, −x Cu x O 3 perovskites: the effect of copper content in the properties and in the NOx storage capacity., Applied Catalysis A, General (2014), http://dx.doi.org/10.1016/j.apcata. 2014.09.032 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. XRD and Raman spectroscopy results indicate that all the copper containing catalysts present a distortion of the original tetragonal structure due to the incorporation of copper into the lattice.The XPS and H 2 -TPR results reveal that the copper catalysts, except for BaTiCu0.5 catalyst, present two copper species (with different electronic interaction with the perovskite) and active surface oxygen species. Additionally, it seems that the fraction of copper with a strong electronic interaction with the perovskite or incorporated into the perovskite structure increases with the copper content.The active sites created on the BaTi 1-x Cu x O 3 perovskite surface bring to the catalysts activity for the NO to NO 2 oxidation and for the NOx adsorption. The NOx storage capacity increases with the copper content and reaches a limit for the BaTiCu2 catalyst (300 µmol/g, at 420ºC) which is within the range of the values reported for the noble metal-based catalysts.

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In-situ Raman spectroscopy of BaTiO3 particles for tetragonal–cubic transformation

Cited by 127 publications

References 37 publications

Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

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In-situ Raman spectroscopy of BaTiO3 particles for tetragonal–cubic transformation

Cited by 127 publications

References 37 publications

Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

An Eco-Friendly Method of BaTiO3 Nanoparticle Synthesis Using Coconut Water

BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

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An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water