Solvent mediated phase stability and temperature dependent magnetic modulation in BiFeO3 nanoparticles

Tahir, Muhammad; Riaz, Saira; Hussain, Syed Sajjad; Awan, Attia; Xu, Yongbing; Naseem, Shahzad

doi:10.1016/j.jmmm.2020.166563

Cited by 11 publications

(3 citation statements)

References 29 publications

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“…The reduction in grain size (see micrographs in Figure 3) leads to the appearance of some hysteresis in the case of the samples sintered by FAST, with a major effect in the case of the specimen sintered by FS. The improvement of magnetic properties in nanostructured BiFeO 3 is currently under discussion, and three principal factors are under consideration: a partial compensation of antiferromagnetic sublattices at the surface, an increase in the spin canting angle of Fe-O-Fe bonds introduced by strain and an annihilation of the spiral spin structure [36,46,47]. Even though there are no important discrepancies in the maximum magnetization at the range of magnetic fields studied, differences in remnant magnetization σ r and coercivity H C can be highlighted.…”

Section: Resultsmentioning

confidence: 99%

Low Temperature Magnetic Transition of BiFeO3 Ceramics Sintered by Electric Field-Assisted Methods: Flash and Spark Plasma Sintering

et al. 2022

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Low temperature magnetic properties of BiFeO3 powders sintered by flash and spark plasma sintering were studied. An anomaly observed in the magnetic measurements at 250 K proves the clear existence of a phase transition. This transformation, which becomes less well-defined as the grain sizes are reduced to nanometer scale, was described with regard to a magneto-elastic coupling. Furthermore, the samples exhibited enhanced ferromagnetic properties as compared with those of a pellet prepared by the conventional solid-state technique, with both a higher coercivity field and remnant magnetization, reaching a maximum value of 1.17 kOe and 8.5 10-3 emu/g, respectively, for the specimen sintered by flash sintering, which possesses the smallest grains. The specimens also show more significant exchange bias, from 22 to 177 Oe for the specimen prepared by the solid-state method and flash sintering technique, respectively. The observed increase in this parameter is explained in terms of a stronger exchange interaction between ferromagnetic and antiferromagnetic grains in the case of the pellet sintered by flash sintering.

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Section: Resultsmentioning

confidence: 99%

Low Temperature Magnetic Transition of BiFeO3 Ceramics Sintered by Electric Field-Assisted Methods: Flash and Spark Plasma Sintering

et al. 2022

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“…The origin of the enhancement of magnetization in nanocrystalline BFO is still a matter of debate. [18,19,23,32] Most of the researchers believe that it can be due to three factors: (1) incomplete compensation of antiferromagnetic sublattices at the surface of nanoparticles-surface-induced magnetization, (2) suppression of spiral spin structure, and (3) increase of spin canting angle introduced by a strain. Our results seem to confirm these findings.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Annealing Temperature on the Structure and Magnetic Properties of Nanocrystalline BiFeO3 Prepared by Sol–Gel Method

Pikula

Szumiata

Siedliska

et al. 2021

Metall Mater Trans A

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In this work, BiFeO3 powders were synthesized by a sol–gel method. The influence of annealing temperature on the structure and magnetic properties of the samples has been discussed. X-ray diffraction studies showed that the purest phase was formed in the temperature range of 400 °C to 550 °C and the samples annealed at a temperature below 550 °C were of nanocrystalline character. Mössbauer spectroscopy and magnetization measurements were used as complementary methods to investigate the magnetic state of the samples. In particular, the appearance of weak ferromagnetic properties, significant growth of magnetization, and spin-glass-like behavior were observed along with the drop of average grain size. Mössbauer spectra were fitted by the model assuming cycloidal modulation of spins arrangement and properties of the spin cycloid were determined and analyzed. Most importantly, it was proved that the spin cycloid does not disappear even in the case of the samples with a particle size well below the cycloid modulation period λ = 62 nm. Furthermore, the cycloid becomes more anharmonic as the grain size decreases. The possible origination of weak ferromagnetism of the nanocrystalline samples has also been discussed.

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“…The lead-free chemistry of the material adds to the advantages. As a result, the material in different forms, such as film, nanostructure, and bulk, has been investigated for various applications over decades [3][4][5]. Wet chemical methods are commonly used to synthesize BFO nanostructures of various sizes and morphology.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis of Multifunctional Bismuth Ferrite Nanostructures: Effect of Heating Conditions on their Photocatalytic Activity

Eledath

Vishwanathan

Chandran

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Bismuth ferrite (BiFeO3) is a multifunctional perovskite material well-known for its lead-free chemistry, multiferroic properties at room temperature, photovoltaic properties, and photocatalytic activity. BiFeO3 nanostructures were synthesized using sol-gel method by varying annealing temperature and annealing rate. The formation of phase-pure BiFeO3 was confirmed using X-ray diffraction and Raman spectroscopy.Using scanning electron microscopy, the size of BiFeO3nanostructures was evaluated to be around 100-500 nm depending on the annealing parameters. The bandgap of the synthesized nanostructures was estimated to be 2.18-2.26 eV, with UV diffuse reflectance spectroscopy. The photocatalytic activity was assessed by the degradation of malachite green dye under visible light irradiation and their correlation with heating parameters is discussed in detail.

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Solvent mediated phase stability and temperature dependent magnetic modulation in BiFeO3 nanoparticles

Cited by 11 publications

References 29 publications

Low Temperature Magnetic Transition of BiFeO3 Ceramics Sintered by Electric Field-Assisted Methods: Flash and Spark Plasma Sintering

Low Temperature Magnetic Transition of BiFeO3 Ceramics Sintered by Electric Field-Assisted Methods: Flash and Spark Plasma Sintering

The Influence of Annealing Temperature on the Structure and Magnetic Properties of Nanocrystalline BiFeO3 Prepared by Sol–Gel Method

Sol-Gel Synthesis of Multifunctional Bismuth Ferrite Nanostructures: Effect of Heating Conditions on their Photocatalytic Activity

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