Exploring reaction pathways in the hydrothermal growth of phase-pure bismuth ferrites

Goldman, Abby R.; Fredricks, Jeremy L.; Estroff, Lara A.

doi:10.1016/j.jcrysgro.2016.09.054

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…It is difficult to obtain a pure phase of BiFeO 3 because the kinetics of phase formation leads to the formation of secondary phases, such as Bi 25 FeO 40 (sillenite) and Bi 2 Fe 4 O 9 (mullite). Various techniques have been reported to prepare single phase of BiFeO 3 , and those are chemical coprecipitation [39], hydrothermal [40], and sol-gel methods [41][42][43]. The ideas of those techniques are to achieve a single phase of BiFeO 3 with a simple route, low temperature, and cost-effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe³⁺ Ion Source

Baqiya¹,

Ghufron²,

Retnowati³

et al. 2020

Nanocrystalline Materials

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Ferrite-based nanoparticles, namely, bismuth ferrite (BiFeO 3 ) and calcium ferrite (CaFe 4 O 7 ), have been synthesized via sol-gel and chemically dissolved method, respectively, employing hematite (α-Fe 2 O 3 ) as the Fe 3+ ion source. Firstly, α-Fe 2 O 3 nanoparticles were prepared from natural iron sand containing mostly magnetite (Fe 3 O 4 ) phase through coprecipitation technique continued by sintering process at 800°C for 2 h. Higher BiFeO 3 phase content was achieved after Bi-Fe gel being annealed at 650°C for 1 h in air atmosphere. Furthermore, major phase of CaFe 4 O 7 was formed with molar ratio of Fe 3+ /Ca 2+ = 6 and sintering temperature of 800°C for 3 h. Interestingly, the powders with dominant CaFe 4 O 7 phase, known as calcium biferrite, exhibit higher ferromagnetism at room temperature. The magnetic properties of the calcium biferrite are comparable to those of barium hexaferrite which can be applied for radar-absorbing material. Meanwhile, BiFeO 3 powders also show weak room temperature ferromagnetism. It has also demonstrated that Ni doping in the bismuth ferrite (BiFe 1− xNi x O 3 with x = 0.1) nanoparticles results in enhancement of the magnetic properties. Moreover, a ferroelectric hysteresis loop and a trend of frequency dependence of the dielectric constant have been observed, which were enhanced by Pb doping (Bi 1− yPb y FeO 3 with y = 0.1). These results suggest a multiferroic behavior in the BiFeO 3 nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe³⁺ Ion Source

Baqiya¹,

Ghufron²,

Retnowati³

et al. 2020

Nanocrystalline Materials

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“…For these reasons, many chemical routes were developed to synthesize the pure BFO phase and also to control the grain size and morphology, and it was found that in most cases, BFO nanoparticles exhibit much better chemical and physical properties compared to micrometric powders [8,13,14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Polyol Process for the Synthesis of Highly Pure BiFeO3 Ovoid-Like Shape Nanostructured Powders

et al. 2019

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Exclusive and unprecedented interest was accorded in this paper to the synthesis of BiFeO3 nanopowders by the polyol process. The synthesis protocol was explored and adjusted to control the purity and the grain size of the final product. The optimum parameters were carefully established and an average crystallite size of about 40 nm was obtained. XRD and Mössbauer measurements proved the high purity of the synthesized nanostructurated powders and confirmed the persistence of the rhombohedral R3c symmetry. The first studies on the magnetic properties show a noticeable widening of the hysteresis loop despite the remaining cycloidal magnetic structure, promoting the enhancement of the ferromagnetic order and consequently the magnetoelectric coupling compared to micrometric size powders.

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Bismuth Ferrites: Synthesis Methods and Experimental Techniques

Jadhav

Mane

Shinde

2020

Bismuth-Ferrite-Based Electrochemical Supercapacitors

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Exploring reaction pathways in the hydrothermal growth of phase-pure bismuth ferrites

Cited by 9 publications

References 22 publications

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe³⁺ Ion Source

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe³⁺ Ion Source

Investigation of Polyol Process for the Synthesis of Highly Pure BiFeO3 Ovoid-Like Shape Nanostructured Powders

Bismuth Ferrites: Synthesis Methods and Experimental Techniques

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Exploring reaction pathways in the hydrothermal growth of phase-pure bismuth ferrites

Cited by 9 publications

References 22 publications

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe3+ Ion Source

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe3+ Ion Source

Investigation of Polyol Process for the Synthesis of Highly Pure BiFeO3 Ovoid-Like Shape Nanostructured Powders

Bismuth Ferrites: Synthesis Methods and Experimental Techniques

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Product

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Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe³⁺ Ion Source

Ferrite-Based Nanoparticles Synthesized from Natural Iron Sand as the Fe³⁺ Ion Source