Tuning the optical, structural and multiferroic properties of Bismuth Ferrite (BiFeO3) Nanoparticles by Doping with Ba

Dubey, Astita; Castillo, Marianela Escobar; Shvartsman, Vladimir V.; Salamon, Soma; Wende, Heiko

doi:10.1109/isaf43169.2019.9034963

Cited by 6 publications

(11 citation statements)

References 16 publications

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“…Further doping of 1–5% Ba does not alter the magnetic transition temperature. Moreover, we found that doping by 5% Ba also does not affect the Néel temperature . Hence, we can conclude from the calorimetric data that the magnetic state of BFO is more strongly affected by Mn doping, than by Ba for this moderate doping, since Mn directly affects the exchange coupling (Fe–O–Mn), whereas Ba could affect it but indirectly and does not in this case.…”

Section: Resultsmentioning

confidence: 64%

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Effect of Mn and Ba Codoping on a Magnetic Spin Cycloid of Multiferroic Bismuth Ferrite Nanoparticles

et al. 2020

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Bismuth ferrite (BFO) is the drosophila of research in multiferroic materials due to its simultaneous magnetic and electric ordering at room temperature. The unfortunate detail is its antiferromagnetic ordering, which practically cancels magnetization and magnetoelectric coupling of the crystals. To induce finite coupling, dopants have been introduced with a certain success so far. Nanoparticles (NPs) can additionally constrain the formation of the magnetic cycloid in BFO due to size confinement. Doping nanoparticles can thus potentially provide a sizeable magnetization of BFO, making applications in computer memories and hyperthermia cancer treatment feasible. We show that the codoping of BFO NPs by Ba and Mn balances the electrochemical equilibrium, reduces the particle size, and shifts the magnetic phase transition to lower temperatures. The ferroelectric properties are retained and the remanent magnetization is increased by 1 order of magnitude: Bi 0.95 Ba 0.05 Fe 0.95 Mn 0.05 O 3 possesses a remanent magnetization of 0.277 Am 2 /kg. Our Mossbauer studies reveal that two effects drive this increase: partial destruction of the spin cycloid due to Mn and increased spin canting due to Ba doping inducing local stress fields. This dopant combination and particular concentration improve the effective magnetization value exceptionally well.

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Section: Resultsmentioning

confidence: 64%

“…Upon Ba codoping, χ initially decreases slightly but then grows as shown in Figure C. For comparison, we have included only 5% Ba-doped BFO data in Figure C,D. The saturation magnetization of the high H c ferromagnetic contribution is much larger for doped NPs as compared to pristine BFO, but is almost independent of the Ba concentration.…”

Section: Resultsmentioning

confidence: 97%

Effect of Mn and Ba Codoping on a Magnetic Spin Cycloid of Multiferroic Bismuth Ferrite Nanoparticles

et al. 2020

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“…To further increase the magnetization of BFO NPs, the ionic substitution at Bi and Fe sites has been found to be the most effective and convenient way. ( Silva et al, 2011 ), ( Dubey et al, 2019 ) Usually, Fe is substituted by transition metals. ( Salak et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

“…Previously, we found that introduction of even 5 mol% Mn into Fe sites significantly increases the magnetization of BFO NPs due to the destruction of the cycloidal spin modulation. ( Dubey et al, 2020 ), ( Dubey et al, 2019 ). This makes Mn-doped BFO NPs better candidates for hyperthermia applications than the pure BFO NPs.…”

Section: Introductionmentioning

confidence: 99%

Rare-earth doped BiFe0.95Mn0.05O3 nanoparticles for potential hyperthermia applications

Dubey

Salamon

Attanayake

et al. 2022

Front. Bioeng. Biotechnol.

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Ionic engineering is exploited to substitute Bi cations in BiFe0.95Mn0.05O3 NPs (BFM) with rare-earth (RE) elements (Nd, Gd, and Dy). The sol-gel synthesized RE-NPs are tested for their magnetic hyperthermia potential. RE-dopants alter the morphology of BFM NPs from elliptical to rectangular to irregular hexagonal for Nd, Gd, and Dy doping, respectively. The RE-BFM NPs are ferroelectric and show larger piezoresponse than the pristine BFO NPs. There is an increase of the maximum magnetization at 300 K of BFM up to 550% by introducing Gd. In hyperthermia tests, 3 mg/ml dispersion of NPs in water and agar could increase the temperature of the dispersion up to ∼39°C under an applied AC magnetic field of 80 mT. Although Gd doping generates the highest increment in magnetization of BFM NPs, the Dy-BFM NPs show the best hyperthermia results. These findings show that RE-doped BFO NPs are promising for hyperthermia and other biomedical applications.

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“…At the same time, BiFeO 3 has spontaneous polarization up to 100 μC/cm 2 [ 10 ]. So, it has become one of the most promising candidate materials [ 11 , 12 , 13 , 14 , 15 , 16 ]. Magnetic-field treatment can make BiFeO 3 exhibit a helical spin structure with a period of 62 nm [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrical Properties of BiFeO3/LDPE Nanocomposite Dielectrics with Magnetization Treatments

Song

Sun

et al. 2021

Polymers

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The purpose of this paper is to study the effect of nano-bismuth ferrite (BiFeO3) on the electrical properties of low-density polyethylene (LDPE) under magnetic-field treatment at different temperatures. BiFeO3/LDPE nanocomposites with 2% mass fraction were prepared by the melt-blending method, and their electrical properties were studied. The results showed that compared with LDPE alone, nanocomposites increased the crystal concentration of LDPE and the spherulites of LDPE. Filamentous flake aggregates could be observed. The spherulite change was more obvious under high-temperature magnetization. An agglomerate phenomenon appeared in the composite, and the particle distribution was clear. Under high-temperature magnetization, BiFeO3 particles were increased and showed a certain order, but the change for room-temperature magnetization was not obvious. The addition of BiFeO3 increased the crystallinity of LDPE. Although the crystallinity decreased after magnetization, it was higher than that of LDPE. An AC test showed that the breakdown strength of the composite was higher than that of LDPE. The breakdown strength increased after magnetization. The increase of breakdown strength at high temperature was less, but the breakdown field strength of the composite was higher than that of LDPE. Compared with LDPE, the conductive current of the composite was lower. So, adding BiFeO3 could improve the dielectric properties of LDPE. The current of the composite decayed faster with time. The current decayed slowly after magnetization.

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Tuning the optical, structural and multiferroic properties of Bismuth Ferrite (BiFeO3) Nanoparticles by Doping with Ba

Cited by 6 publications

References 16 publications

Effect of Mn and Ba Codoping on a Magnetic Spin Cycloid of Multiferroic Bismuth Ferrite Nanoparticles

Effect of Mn and Ba Codoping on a Magnetic Spin Cycloid of Multiferroic Bismuth Ferrite Nanoparticles

Rare-earth doped BiFe0.95Mn0.05O3 nanoparticles for potential hyperthermia applications

Investigation of Electrical Properties of BiFeO3/LDPE Nanocomposite Dielectrics with Magnetization Treatments

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