Synthesis and characterization of FeTiO3 ceramics

Gambhire, A.B.; Lande, Machhindra K.; Rathod, Sandip B.; Arbad, Balasaheb R.; Vidhate, Kaluram N.; Gholap, R.S.; Patil, K.R.

doi:10.1016/j.arabjc.2011.05.012

Cited by 36 publications

(17 citation statements)

References 21 publications

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“…Considering that anatase TiO 2 crystallizes at 300 °C, higher temperatures (550 and 750 °C) along with oxygen-containing atmosphere is suggested to facilitate Ti diffusion and substitution in hematite matrix. The Ti 2p feature of our doped sample bears similarity with that of Fe 2 TiO 5 (an Fe–Ti–O semiconductor with 2.2 eV band gap) and FeTiO 3 (Figure c,d). , Relatively weak orbital-hybridization energy of Ti 2p–O 1s can be altered by nearest Fe–O bonding, thereby resulting in low-binding-energy shift. The meticulous comparative analysis of surface chemical states of TiO 2 and Ti:Fe 2 O 3 imply an inference, where Fe–Ti–O nanocomposites are primary phase in Τi:Fe 2 O 3 film rather than TiO 2 –Fe 2 O 3 structure.…”

Section: Results and Discussionsupporting

confidence: 56%

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Guo

Mishra

et al. 2018

ACS Appl. Nano Mater.

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Hematite (α-Fe 2 O 3 )-based photoanode for photoelectrochemical water oxidation has been intensively studied for decades. Doping with isovalent or aliovalent ions is one way to mitigate several intrinsic drawbacks of bare hematite. While addition of Ti in the bulk has been reported for improving photoresponse, several aspects of effects of Ti impregnation have not been justified. In this work, Ti:Fe 2 O 3 nanoellipsoids synthesized by a facile one-pot hydrothermal process present improved photoelectrochemical response. Tuned symmetry of Fe−O and Fe−Fe (Fe−Ti) with less recombination during charge transportation, tuned electron configuration of O 2p -Fe 4s4p hybridization in Ti-adjoining regime with enhanced electron relaxation within Fe 2 O 3 lattice, suppressed O 2 /H 2 O back reaction (reduction of O 2 ), and inhibit formation of surface defects during hydrothermal synthesis were attested by X-ray absorption spectroscopy, Mott−Schottky analysis, and photoelectrochemical impedance spectroscopy. Additionally, Ti:Fe 2 O 3 showed enhanced light absorption. Hydrogen evolution rate of 11.76 μmol h −1 cm −2 under illumination was observed while using Ti:Fe 2 O 3 as the working electrode. Additional experiments on Mn 4+ and In 3+ incorporation showed mixed effects. This study provides insights and clarification toward "Ti-doping" of the hematite photoanode for solar hydrogen production from water.

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Section: Results and Discussionsupporting

confidence: 56%

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Guo

Mishra

et al. 2018

ACS Appl. Nano Mater.

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“…76‐2372). The average size of the crystal structure of FT500 sample was ∼36 nm, determined using the Scherrer equation [21].…”

Section: Resultsmentioning

confidence: 99%

“…It also shows unique magnetic [16] and semiconducting properties, with a bandgap of 2.54–2.58 eV [17, 18]. Previously, the synthesis of FeTiO 3 nanoparticles was reportedly carried out using chemical and citrate gel methods [19]; hydrothermal [20], sol–gel [21], liquid mix, and H 2 /H 2 O 2 reduction processes [22]; solid‐state reaction [23]; and ball milling [16] methods. As we seen from this Letter, it has promising electrochemical properties relevant to the area of energy storage.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of FeTiO ₃ perovskite nanomaterials for electrochemical energy storage application

Srither

Dhineshbabu

2019

Micro & Nano Letters

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In this study, ilmenite [iron titanate (FeTiO 3)] perovskite nanoparticles were synthesised by wet chemical method and sintered at two temperatures, namely 350°C (FT350) and 500°C (FT500). The phase structure, crystallinity, microstructure, particle size, and purity of the sintered samples were extensively studied. Electrochemical measurements such as cyclic voltammetric studies, electrochemical impedance spectroscopy (EIS), and discharge measurements were carried out. The results of the cyclic voltammetric studies showed that sample prepared at 500°C delivers high specific capacitance (42 F g −1), which is significantly greater as compared to that of 350°C sample. Moreover, the results of the EIS study show that 500°C delivers better capacitance than 350°C. The FeTiO 3 samples sintered at 350 and 500°C used as cathodes in a novel Mg/FeTiO 3 cell delivered a discharge capacity of 129 and 90 mA h g −1 , respectively. According to the study's data, for the first time it has confirmed that FeTiO 3 is suitable for using it as a cathode material in Mg/FeTiO 3 primary cell. The discharge capacity of 500°C was found to be 70% higher when compared to 350°C. Thus, the proposed results show that the electrochemical behaviour of the sintered sample 500°C is superior to that of 350°C.

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“…The gap between the α-channel and β-channel is~0.30 eV. The experimental band gap is 2.54-2.58 eV [43]. The underestimation is due the inadequate description of self-interaction in different functionals, including GGA-PBE [44].…”

Section: Electronic Structures Of Doped Fetio 3 Complexesmentioning

confidence: 98%

Theoretical Modeling of Defects, Dopants, and Diffusion in the Mineral Ilmenite

et al. 2019

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The iron titanium oxide ilmenite (FeTiO3) is a technologically and economically important mineral in the industrial preparation of titanium-based pigments and spintronic devices. In this study, atomistic simulation techniques based on classical pair potentials are used to examine the energetics of the intrinsic and extrinsic defects and diffusion of Fe2+ ions in FeTiO3. It is calculated that the cation anti-site (Fe‒Ti) cluster is the most dominant defect, suggesting that a small amount of cations exchange their positions, forming a disordered structure. The formation of Fe Frenkel is highly endoergic and calculated to be the second most stable defect process. The Fe2+ ions migrate in the ab plane with the activation energy of 0.52 eV, inferring fast ion diffusion. Mn2+ and Ge4+ ions are found to be the prominent isovalent dopants at the Fe and Ti site, respectively. The formation of additional Fe2+ ions and O vacancies was considered by substituting trivalent dopants (Al3+, Mn3+, Ga3+, Sc3+, In3+, Yb3+, Y3+, Ga3+, and La3+) at the Ti site. Though Ga3+ is found to be the candidate dopant, its solution enthalpy is >3 eV, suggesting that the formation is not significant at operating temperatures.

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Synthesis and characterization of FeTiO3 ceramics

Cited by 36 publications

References 21 publications

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Synthesis and characterisation of FeTiO ₃ perovskite nanomaterials for electrochemical energy storage application

Theoretical Modeling of Defects, Dopants, and Diffusion in the Mineral Ilmenite

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Synthesis and characterization of FeTiO3 ceramics

Cited by 36 publications

References 21 publications

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe2O3: How Does Ti4+ Improve Photoelectrochemical Activity?

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe2O3: How Does Ti4+ Improve Photoelectrochemical Activity?

Synthesis and characterisation of FeTiO 3 perovskite nanomaterials for electrochemical energy storage application

Theoretical Modeling of Defects, Dopants, and Diffusion in the Mineral Ilmenite

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Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Synthesis and characterisation of FeTiO ₃ perovskite nanomaterials for electrochemical energy storage application