Structure and properties of plasma sprayed BaTiO3 coatings: Spray parameters versus structure and photocatalytic activity

Ctibor, Pavel; Ageorges, Hélène; Štengl, Václav; Murafa, Nataliya; Píš, Igor; Zahoranová, Tatiana; Nehasil, V.; Pala, Zdeněk

doi:10.1016/j.ceramint.2011.04.003

Cited by 23 publications

(11 citation statements)

References 31 publications

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“…4) are a characteristic sign of the tetragonal structure. The tetragonal BT phase was the single constituent of the feedstock powder [23]. The intensity ratio of individual peaks of the feedstock as well as of the coatings is very similar to patterns reported in the literature [24].…”

Section: Phase Analysis By Xrdsupporting

confidence: 67%

“…Probably due to the presence of hydrogen species [23], the current-voltage characteristic has a similar character as in the case of amorphous BT [25].…”

Section: Electric Measurementsmentioning

confidence: 92%

“…This temperature is 75 1C above the theoretical temperature of the t-c phase transformation. At all frequencies [23,24] there is a monotonous increase of the permittivity with temperature. The permittivity values exhibit a pronounced increase when the temperature is above room temperature.…”

Section: Electric Measurementsmentioning

confidence: 95%

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Phase stabilization in plasma sprayed BaTiO3

Ctibor

Seiner

Sedláček

et al. 2013

Ceramics International

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This paper presents a comparison of properties of BaTiO 3 ceramics prepared by two different production methods: gas-stabilized plasma spraying (GSP) and spark plasma sintering (SPS). Samples of both materials were evaluated by various techniques, the goal being to detect the Curie temperature of the ferroelectric transformation between the tetragonal and the cubic phase. All tests, resonant ultrasound spectroscopy, dielectric measurements, differential scanning calorimetry and temperature-resolved X-ray diffraction (XRD), used in combination, proved the absence of this transformation in the case of GSP coating up to 500 1C. Similarly, the tetragonal-toorthorhombic transition temperature is shifted downwards, this transition probably taking place in a small fraction of the volume of coating. The SPS samples exhibit several anomalies, such as a strong anisotropy of relative permittivity, but their phase transformations were detected in the usual temperature ranges.

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Section: Phase Analysis By Xrdsupporting

confidence: 67%

“…Probably due to the presence of hydrogen species [23], the current-voltage characteristic has a similar character as in the case of amorphous BT [25].…”

Section: Electric Measurementsmentioning

confidence: 92%

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Phase stabilization in plasma sprayed BaTiO3

Ctibor

Seiner

Sedláček

et al. 2013

Ceramics International

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“…The presence of s and p states inside the band gap was attributed to the formation of clusters (TiO 6 or TiO 5 ) which decrease the band gap emission [10,11]. BT has tetragonal structure at 393 K and phase transition occurs at 1730 K [12]. Hu et al reported the deposition of BT [5] and Ba 0.9 Sr 0.1 TiO 3 films [13] with different film thickness.…”

Section: Introductionmentioning

confidence: 99%

Thickness dependence of structural, optical and luminescence properties of BaTiO3 thin films prepared by RF magnetron sputtering

Maneeshya¹,

Anitha²,

Thomas³

et al. 2015

J Mater Sci: Mater Electron

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BaTiO 3 thin films were deposited onto quartz substrates by RF magnetron sputtering. X-ray diffraction pattern showed the formation of BT thin films with a tetragonal structure with orientations along (101) plane. Average crystallite size increased from 12.52 to 14.87 nm as the film thickness increased from 207 to 554 nm. With the increase in film thickness, the structural disorder decreases and the crystalline quality of the films gradually improved. The film exhibited good adherence to the substrate and are crack free. X-ray photoelectron spectroscopy revealed the presence of barium, titanium and oxygen in BT film. An average transmittance of [80 % was observed for all the films. This high transmittance BT films in the visible region is suitable for various electro-optic applications. The transmittance spectra showed high UV-shielding properties. Optical band gap was found to decrease from 4.55 to 3.70 eV with increase of film thickness, whereas the refractive index was found to increase. The refractive index of the BT films can be tuned between 2.11 and 2.21 at 550 nm. The real and imaginary dielectric constants with increase in film thickness were investigated. The low dissipation factor of BT thin films makes it a promising material for frequency agile applications. The emission spectra of BT thin films consist of near band edge excitonic UV emission and defect related emission in the visible range. The PL emission bands in UV and visible region of BT thin films make them suitable for electro-optic devices and light emitters.

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“…Numerous papers have demonstrated the photocatalytic activity of supported coatings in water solutions using model dyes, in particular methylene blue [19,20], as well as the pink dye Rhodamine B [15], according to more or less standardised methods. Other researchers have preferred the use of model organic or inorganic gaseous molecules such as acetone [21], acetaldehyde [15], ethanol [11], NO x [22], or even SO 2 [23]. However, no study has been found in which any of these plasma-sprayed photocatalytic coatings have been used to treat wastewater from a real industrial environment.…”

Section: Introductionmentioning

confidence: 99%

Application of plasma-sprayed TiO2 coatings for industrial (tannery) wastewater treatment

Bordes

Vicent

Moreno

et al. 2015

Ceramics International

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Fine-structured photocatalytic TiO 2 coatings were deposited by atmospheric plasma spraying (APS) on austenitic stainless steel coupons. One commercial spray-dried nanostructured TiO 2 powder and five spray-dried powders obtained from suspensions containing mixtures of submicrometric and nanometric TiO 2 particles were used as feedstock materials. Coating microstructure and phase composition were characterised using FEG-SEM and XRD techniques. The photocatalytic activity of the coatings was determined by measuring the degradation of methylene blue dye in aqueous solution.The experimental data were observed to follow a pseudo-first-order kinetic. The kinetic constants displayed a clear relationship with coating anatase content. 2The photocatalytic decontamination capability of one of these APS coatings was subsequently investigated by treating an industrial tannery wastewater. The photocatalytic experiments with these TiO 2 coated coupons were carried out in a selfdesigned reactor. Partial degradation of the pollutants was observed, owing to a decrease in Total Organic Carbon (TOC), in addition to a significant decolouration effect, mainly relating to the removal of aromatic organic compounds typically present in tannery wastewater. The results demonstrate the potential use of plasma-sprayed photocatalytic TiO 2 coatings in tannery wastewater treatment.

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Structure and properties of plasma sprayed BaTiO3 coatings: Spray parameters versus structure and photocatalytic activity

Cited by 23 publications

References 31 publications

Phase stabilization in plasma sprayed BaTiO3

Phase stabilization in plasma sprayed BaTiO3

Thickness dependence of structural, optical and luminescence properties of BaTiO3 thin films prepared by RF magnetron sputtering

Application of plasma-sprayed TiO2 coatings for industrial (tannery) wastewater treatment

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