Structural and photocatalytic characterization of BaFe2O4 obtained at low temperatures

Dalt, Silvana Da; Sousa, Bruna Berti de; Alves, Annelise Kopp; Bergmann, Carlos Pérez

doi:10.1590/s1516-14392011005000069

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…Barium ferrite is often used in the manufacture of permanent magnets, magnetic storage media, magnetic materials, and pigments. The heightened interest in ferrites is mainly due to the abundance of starting materials and a low production cost …”

Section: Results and Discussionmentioning

confidence: 99%

“…The heightened interest in ferrites is mainly due to the abundance of starting materials and a low production cost. 21 synthesized by both the microwave precipitation method and the direct decomposition method, were evaluated for the coal CLC reaction. Group 2 metal ferrite oxygen carriers showed better reduction and oxidation rates than Fe 2 O 3 for coal CLC.…”

Section: Effect Of Reactormentioning

confidence: 99%

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Novel New Oxygen Carriers for Chemical Looping Combustion of Solid Fuels

Fan

Siriwardane

2014

Energy Fuels

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Several bimetallic oxygen carriers, MFe 2 O 4 (M = Co, Ni, Cu, Mg, Ca, Sr, and Ba) and MnFeO 3 , prepared by the precipitation method in a microwave and the direct decomposition method, were tested for potential use in the application of chemical looping combustion (CLC) of solid fuels. Thermogravimetric analysis (TGA) was used to study their reduction rate, oxidation rate, and cyclic reduction/oxidation properties. Comparative experimental data of novel bimetallic ferrites and pure Fe 2 O 3 and CuO showed that all bimetallic ferrites had better reduction rates than pure Fe 2 O 3 . The Group 2 metal ferrites had better reduction and oxidation rates than transition-metal ferrites. BaFe 2 O 4 was the highest performing among all bimetallic ferrites during both reduction and oxidation reactions. The reduction rate of BaFe 2 O 4 is comparable to that of CuO at higher reaction temperatures (>900°C). A 10 wt % loading of an inert support on the surface of the bimetallic oxygen carriers significantly decreased the particle agglomeration during the cyclic tests, which contributed to a better cyclic reaction performance.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Effect Of Reactormentioning

confidence: 99%

Novel New Oxygen Carriers for Chemical Looping Combustion of Solid Fuels

Fan

Siriwardane

2014

Energy Fuels

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“…Based on the available literature reports of the title ferrite NPs, it could be noted that several polymorphic phases of the barium ferrites have been identified such as BaFe 2 O 4 (Orthorhombic-Cmc2 1 ), Ba 2 Fe 2 O 5 (monoclinic), BaFe 6 O 11 , Ba 3 Fe 2 O 6 (cubic), Ba 7 Fe 4 O 13 (cubic) and BaFe 12 O 19 (hexagonal-P6 3 /mmc) [28]. There are lots of scientific reports available which predominantly report synthesis and characterization of barium monoferrites [29,30] but as of now, to the best of our knowledge, there are only a very few publications that address the crystallographic phase stability and magnetic phase stability at high-pressure and high energy irradiation as well as shocked conditions. Hence, the real applicability of the synthesized material for the above-suggested applications is unclear so that it is identified to be one of the potential research problems which have to be solved before suggesting the materials for the required applications even though it is well suited for certain specific applications.…”

Section: Introductionmentioning

confidence: 99%

Assessment of shock resistance of barium ferrite at dynamic shocked conditions

Sivakumar

Mowlika²,

Dhas³

et al. 2021

J Mater Sci: Mater Electron

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This research work probes into the crystallographic and magnetic structural stability of barium ferrite nanoparticles (BaFe 2 O 4 NPs) at dynamic shock waveexposed conditions. Barium ferrite NPs have been prepared by co-precipitation method and the structural stability of the title ferrite has been scrutinized subsequent to the impact of shock waves (Mach number 2.2) at different counts of shocks viz., 50, 100 and 150, respectively, and their performance on shock resistance has been analyzed by the techniques of X-ray diffraction (XRD), ultraviolet diffused reflectance spectroscopy (UV-DRS), and vibrating sample magnetometry (VSM). Based on the results of the observed analytical measurements, it is substantiated that the test sample has not undergone any of the crystallographic phase transitions even though it has the crystal structure of polymorphism which manifests as the viable witness for the structural stability of the test sample that has been also authenticated by the XRD results. Very few slight changes are observed in the optical and magnetic properties of BaFe 2 O 4 NPs at shocked conditions. More interestingly, the existence of mixed magnetic phase (ferro and anti-ferromagnetic) is witnessed at 50 and 100 shocked conditions because of the shock wave-induced directional disorder of the spin orientations of the test samples which is typically called ''kink behavior''. The observed results reveal that the divalent ferrite NPs of BaFe 2 O 4 have high shock resistance than that of the technologically important ferrites such as ZnFe 2 O 4 and a-Fe 2 O 3 NPs. Hence, the title material could be considered as a prospective candidate for the aerospace device fabrication because of the exceptional stability of its structure against the shock wave impact.

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“…magnetic storage and permanent magnets [11]. Moreover, many works have reported its wide use as photocatalytic [12,13] and pigments [14].…”

Section: Introductionmentioning

confidence: 99%