X-ray photoelectron spectroscopy study of Bi4Ti3O12 ferroelectric ceramics

Jovalekić, Čedomir; Pavlović, Marko; Osmokrović, P.; Atanasoska, Lj.

doi:10.1063/1.120961

Cited by 173 publications

(77 citation statements)

References 10 publications

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“…18 The formation of oxygen vacancies in BLSFs results from the fragility of the Bi-O bonds, 19 which results in nominal valence states for bismuth lower than 3 + . 20 An oxygen vacancy hopping mechanism is responsible for dielectric relaxation, which is therefore a thermally activated process and exponentially dependent on temperature. The losses increased with increasing temperature.…”

Section: A Crystal Structurementioning

confidence: 99%

The effect of Nd substitution on the electrical properties of Bi3NbTiO9 Aurivillius phase ceramics

Hong-tao

Yan

Reece

2009

Journal of Applied Physics

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Effect of lattice occupation behavior of Li+ cations on microstructure and electrical properties of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics J. Appl. Phys. 109, 054102 (2011) The effect of Nd substitution on the microstructures and electrical properties of Aurivillius phase ferroelectric Bi 3 NbTiO 9 -based ceramics has been studied. All of the Bi 3−x Nd x NbTiO 9 ͑0 Յ x Յ 1͒ ceramics are ferroelectrics. The Curie point T C decreased with increasing Nd doping content x. The Bi 3−x Nd x NbTiO 9 ceramics exhibited a sharp ferroelectric-paraelectric phase transition at small x values ͑x Յ 0.6͒, whereas a diffuse phase transition was observed at higher x values ͑x Ն 0.8͒. Both the piezoelectric constant d 33 and the dc electrical resistivity of Bi 3 NbTiO 9 ceramics were greatly enhanced by Nd substitution on the A sites. The improved properties can be attributed to the fact that Nd substitution depressed the generation of oxygen vacancies. A combination of high d 33 values, high resistivity, and high T C points ͑Ͼ700°C͒ suggests that the Bi 3−x Nd x NbTiO 9 ceramics with x Յ 0.6 could be good candidates for high-temperature piezoelectric applications.

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Section: A Crystal Structurementioning

confidence: 99%

The effect of Nd substitution on the electrical properties of Bi3NbTiO9 Aurivillius phase ceramics

Hong-tao

Yan

Reece

2009

Journal of Applied Physics

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“…The line shape of the O 1s core level photoemission spectra of the thin films is shown in Figures 8(a)-8(f), and it is important to remark that two peaks are clearly observed. The first peak located at the low binding energy 529.8 eV can be assigned to the Ti-O bond while the second peak located at 532.5 eV can be attributed to the oxygen bonded to bismuth [17,18]. Jovalekić et al have reported that oxygen atom in a stronger Ti-O bond carries a higher effective negative charge than in a weaker Bi-O bond [17].…”

Section: Elemental Compositionmentioning

confidence: 99%

“…The first peak located at the low binding energy 529.8 eV can be assigned to the Ti-O bond while the second peak located at 532.5 eV can be attributed to the oxygen bonded to bismuth [17,18]. Jovalekić et al have reported that oxygen atom in a stronger Ti-O bond carries a higher effective negative charge than in a weaker Bi-O bond [17]. This correlation between the effective charge of oxygen atom and the binding energy of oxygen core electrons agrees with previous reports [17,18].…”

Section: Elemental Compositionmentioning

confidence: 99%

“…Jovalekić et al have reported that oxygen atom in a stronger Ti-O bond carries a higher effective negative charge than in a weaker Bi-O bond [17]. This correlation between the effective charge of oxygen atom and the binding energy of oxygen core electrons agrees with previous reports [17,18]. Table 2 shows the optical band gap (Eg) values determined using the KubelkaMunk method; this was done by transforming the reflectance spectra of the samples with different Bi contents to the Kubelka-Munk function, F(R), and then plotting (F(R) E) 1/2 versus E, considering a direct allowed transition band gap.…”

Section: Elemental Compositionmentioning

confidence: 99%

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Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO₂ Thin Films Obtained by Sol Gel

Solís-Casados

Escobar‐Alarcón

Alvarado-Pérez

et al. 2018

International Journal of Photoenergy

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The synthesis of Bi-modified TiO 2 thin films, with different Bi contents, is reported. The obtained materials were characterized by energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (RS), X-ray diffraction (XRD), photoluminescence (PL), and diffuse reflectance spectroscopy (DRS), in order to obtain information on their chemical composition, vibrational features, and optical properties, respectively. Compositional characterization reveals that the bismuth content can be varied in an easy way from 0.5 to 25.4 at. %. Raman results show that the starting material corresponds to the anatase phase of crystalline TiO 2 , and Bi addition promotes the formation of bismuth titanates, Bi 2 Ti 2 O 7 at Bi contents of 10.4 at. % and the Bi 4 Ti 3 O 12 at Bi contents of 21.5 and 25.4 at. %. Optical measurements reveal that the band gap narrows from 3.3 eV to values as low as 2.7 eV. The photocatalytic activity was tested in the degradation reaction of the Malachite Green carbinol base dye (MG) as a model molecule under simulated sunlight, where the most relevant result is that photocatalytic formulations containing bismuth showed higher catalytic activity than pure TiO 2 . The higher photocatalytic activity of MG degradation of 67% reached by the photocatalytic formulation of 21.5 at. % of bismuth is attributed to the presence of the crystalline phase perovskite-type bismuth titanate, Bi 4 Ti 3 O 12 .

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“…9͒ exhibits a severe fatigue failure. From recent x-ray photoelectron spectroscopy ͑XPS͒ studies of BT ceramics, 10 and ͑001͒ epitaxial thin films of SBT and BIT. 11 Park et al 11 argued that the difference in oxygen stability in the perovskite layer between SBT and BT, should be related to their distinct fatigue resistance, in addition to the universally accepted role of the ͑Bi 2 O 2 ͒ 2+ layer.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric fatigue endurance of Bi4−xLaxTi3O12 thin films explained in terms of x-ray photoelectron spectroscopy

Simões

Riccardi

Cavalcante

et al. 2007

Journal of Applied Physics

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The nature of defects in polycrystalline Bi 4−x La x Ti 3 O 12 ͑BLT͒ thin films with x = 0.00, 0.25, 0.50, and 0.75 was evaluated by x-ray photoemission spectroscopy measurements. The influence of oxygen vacancies and substitution of Bi for La atoms were discussed. In the BLT thin films, it was found that the oxygen ions at the metal-oxygen octahedral were much more stable than those at the ͓Bi 2 O 2 ͔ layers. On the other hand, for Bi 4 Ti 3 O 12 ͑BIT͒ thin film, oxygen vacancies could be induced both at the titanium-oxygen octahedral and at the ͓Bi 2 O 2 ͔ layers. The oxygen-vacancy defect pairs determined in BIT and Bi 3.75 La 0.25 Ti 3 O 12 ͑BLT025͒ can pin the polarization of surrounding lattices leading to fatigue of capacitors. Meanwhile, the concentration of similar defect pairs is relatively low in heavily doped BIT films and then good fatigue resistance is observed.

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X-ray photoelectron spectroscopy study of Bi4Ti3O12 ferroelectric ceramics

Cited by 173 publications

References 10 publications

The effect of Nd substitution on the electrical properties of Bi3NbTiO9 Aurivillius phase ceramics

The effect of Nd substitution on the electrical properties of Bi3NbTiO9 Aurivillius phase ceramics

Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO₂ Thin Films Obtained by Sol Gel

Ferroelectric fatigue endurance of Bi4−xLaxTi3O12 thin films explained in terms of x-ray photoelectron spectroscopy

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X-ray photoelectron spectroscopy study of Bi4Ti3O12 ferroelectric ceramics

Cited by 173 publications

References 10 publications

The effect of Nd substitution on the electrical properties of Bi3NbTiO9 Aurivillius phase ceramics

The effect of Nd substitution on the electrical properties of Bi3NbTiO9 Aurivillius phase ceramics

Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO2 Thin Films Obtained by Sol Gel

Ferroelectric fatigue endurance of Bi4−xLaxTi3O12 thin films explained in terms of x-ray photoelectron spectroscopy

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Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO₂ Thin Films Obtained by Sol Gel