X‐ray Absorption Spectroscopy Studies of the Room‐Temperature Ferromagnetic Fe‐Doped 6H–BaTiO<sub>3</sub>

Mikulska, Iuliia; Valant, Matjaž; Arčon, Iztok; Lisjak, Darja

doi:10.1111/jace.13408

Cited by 8 publications

(2 citation statements)

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“…Extended X‐ray absorption spectroscopic (EXAFS) is another powerful technique for probing the local environment of dopant atoms (coordination number, bond parameters, etc.) in perovskite oxides, and like SAED can settle speculation about possible doping sites in the crystal . In addition, doping modifies the valence states in the A/B sites of perovskite oxides, generally resulting in the co‐introduction of lattice oxygen defects in varying concentrations, as will be discussed in the subsequent section.…”

Section: Defect Engineering Of Perovskite Oxidesmentioning

confidence: 99%

Recent Progress in Photocatalytic CO₂ Reduction Over Perovskite Oxides

2017

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Photocatalytic CO 2 reduction has attracted widespread attention in recent years, due its potential to reduce anthropogenic CO 2 emissions from fossil fuel combustion whilst also yielding fuels and valuable chemical feedstocks. Among the various semiconductor photocatalysts capable of driving CO 2 reduction under direct sunlight, perovskite oxides are arguably the most promising due to their high catalytic activity, good stability, long charge diffusion lengths, and compositional flexibility that allows precise bandgap and band edge tuning. This review aims to showcase recent advances in the design of perovskite oxides and their derivatives for photocatalytic CO 2 reduction, placing particular emphasis on structure modulation, defect engineering, and interface construction as rational approaches for enhancing solar-driven CO 2 conversion to CH 4 , CO, and other valuable oxygenates (C x H y O z ).

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Section: Defect Engineering Of Perovskite Oxidesmentioning

confidence: 99%

Recent Progress in Photocatalytic CO₂ Reduction Over Perovskite Oxides

2017

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“…There are few more reports where Fe doping could increase electrocaloric and other electrical properties in BCZTO 38,39 . Fe doping was also well explored in BaTiO 3 ceramics for various viewpoints 40‐46 . BCZTO was reported for UV light active photocatalyst 10 .…”

Section: Introductionmentioning

confidence: 99%

Piezo/pyro/photo‐catalysis activities in Ba_0.85Ca_0.15(Ti_0.9Zr_0.1)_1‐xFe_xO₃ ceramics

Sharma

Vaish

2020

J. Am. Ceram. Soc.

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Ba 0.85 Ca 0.15 (Ti 0.9 Zr 0.1) 1-x Fe x O 3 (x = 0, 0.5, and 1%) ceramics were studied for piezocatalysis, photocatalysis, and pyrocatalysis using dye degradation in the simulated wastewater. The effect of electrical poling was also performed and found a significant impact of poling on all three catalytic reactions. Fe decreased the optical bandgap of Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (BCZTO) to the visible region. Bandgap for x = 0, 0.005, and 0.01 was found to be 3.14 eV, 2.75 eV, and 2.61 eV, respectively. Interestingly, visible light photocatalytic activity was observed after Fe inclusion in BCZTO lattice. These compositions have also demonstrated dye degradation under ultrasonication (piezocatalytsis) and during temporal temperature change (pyrocatalysis). Results indicate promising multicatalysis in BCZTO ceramics which can be tuned using Fe substitution. K E Y W O R D S ferroelectric, multicatalysis, photocatalysis, piezocatalysis, piezoelectric, pyrocatalysis 46 | SHARMA And VAISH From the above-mentioned discussion, it is clear that catalytic reactions can be triggered using ambient mechanical vibrations, thermal energy, or photons. If one material can demonstrate all these catalysis phenomena (piezocatalysis, pyrocatalysis, and photocatalysis), it can be a more effective, versatile, and multifunctional utility. This could be possible after the tuning bandgap of piezoelectric semiconductors. To attempt in the direction of multicatalysis, BCZTO was selected in the present study. BCZTO is a famous piezoelectric material. It has been reported for many piezo/pyro/ferroelectric related applications. 10 To create visible light photocatalytic activity in the BCZTO, Fe +3 (accepter) doping was done in the BCZTO. Such acceptor doping may create vacancies defects and reduce the effective bandgap. In the recent past, Fe was doped in various BaTiO 3 based ceramics for achieving various physical properties such as multiferroic characteristics. Fe substitution decreases tetragonality in BCZTO which was reflected from X-ray diffraction data along with dielectric behavior. 36 Moreover, the ferro-para phase transition was diffused after Fe doping which indicates the breaking of long-range interaction of ferroelectric domains to defects created by Fe. Such relaxer-like behavior was also noticed in an another article where Fe doping could also increase electrostrictive coefficients of the BCZTO. 37 There are few more reports where Fe doping could increase electrocaloric and other electrical properties in BCZTO. 38,39 Fe doping was also well explored in BaTiO 3 ceramics for various viewpoints. 40-46 BCZTO was reported for UV light active photocatalyst. 10 Fe doping can reduce its bandgap for visible light activation of the BCZTO and hence Fe was introduced in the BCZTO as Ba 0.85 Ca 0.15 (Ti 0.9 Zr 0.1) 1-x Fe x O 3. Finally, piezocatalysis, pyrocatalysis, and photocatalysis performance were examined and reported in the subsequent sections.

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Dielectric characteristics of B-site-modified hexagonal-barium titanate

et al. 2015

J Mater Sci: Mater Electron

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X‐ray Absorption Spectroscopy Studies of the Room‐Temperature Ferromagnetic Fe‐Doped 6H–BaTiO₃

Cited by 8 publications

References 36 publications

Recent Progress in Photocatalytic CO₂ Reduction Over Perovskite Oxides

Recent Progress in Photocatalytic CO₂ Reduction Over Perovskite Oxides

Piezo/pyro/photo‐catalysis activities in Ba_0.85Ca_0.15(Ti_0.9Zr_0.1)_1‐xFe_xO₃ ceramics

Dielectric characteristics of B-site-modified hexagonal-barium titanate

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X‐ray Absorption Spectroscopy Studies of the Room‐Temperature Ferromagnetic Fe‐Doped 6H–BaTiO3

Cited by 8 publications

References 36 publications

Recent Progress in Photocatalytic CO2 Reduction Over Perovskite Oxides

Recent Progress in Photocatalytic CO2 Reduction Over Perovskite Oxides

Piezo/pyro/photo‐catalysis activities in Ba0.85Ca0.15(Ti0.9Zr0.1)1‐xFexO3 ceramics

Dielectric characteristics of B-site-modified hexagonal-barium titanate

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X‐ray Absorption Spectroscopy Studies of the Room‐Temperature Ferromagnetic Fe‐Doped 6H–BaTiO₃

Recent Progress in Photocatalytic CO₂ Reduction Over Perovskite Oxides

Recent Progress in Photocatalytic CO₂ Reduction Over Perovskite Oxides

Piezo/pyro/photo‐catalysis activities in Ba_0.85Ca_0.15(Ti_0.9Zr_0.1)_1‐xFe_xO₃ ceramics