Substitution driven structural and magnetic properties and evidence of spin phonon coupling in Sr-doped BiFeO<sub>3</sub> nanoparticles

Chauhan, Sunil; Kumar, Manoj; Pal, Prabir

doi:10.1039/c6ra11021e

Cited by 38 publications

(11 citation statements)

References 68 publications

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“…The doping effect leads to an enhanced spontaneous magnetization and was found to maximize at x = 0.75 with the value of 0.52 emu/g. Similar results are observed in the divalent Sr-doped compound BiFeO 3 (Chauhan et al, 2016). In the case of Sr-doped La 2−x Sr x NiO 4±δ , the canting of Ni spins caused by the structural distortion might be responsible for the improved magnetization.…”

Section: Methodssupporting

confidence: 77%

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Sheng

et al. 2020

Front. Mater.

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This work aims to achieve the excellent microwave absorption in layered dielectric nickelate compounds. The phase, microstructure, electromagnetic properties, and microwave absorption of the Sr-modified La 2−x Sr x NiO 4±δ (x = 0, 0.3, 0.5, 0.75) nickelates were investigated, determining and analyzing the role of Sr doping level. All compounds reveal the single tetragonal phase identified as the I4/mmm space group, and the lattice parameters correlate with the doping content, evidenced by Rietveld refinement. By introducing strontium, the pronouncedly increased electronic conductivity contributes to the high dielectric loss, which gives rise to a superior attenuation ability and absorbing bandwidth. A minimum reflection loss of-21.07 dB was found in La 2−x Sr x NiO 4±δ (x = 0.75) at a thickness of 1.9 mm, covering the effective bandwidth of 2.9 GHz. This enhanced microwave absorbing performance in nickelate shows promise in the radar absorbing field.

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Section: Methodssupporting

confidence: 77%

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Sheng

et al. 2020

Front. Mater.

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“…However, the resonance frequency and the shape of the spectral line depend on the characteristics of the samples. According to previous reports [32][33][34][35], the polar phonon modes of A1-1, A1-2, and E1 are mainly contributed to spin-phonon coupling, magnetic anisotropy, and magnetoelectric coupling, respectively. In this research, a slight shift of the A1-1, A1-2, and A1-3 modes (assigned to the Bi-O bonds) to higher frequencies and a significant change in their intensities with the increase of the Ce and Zr cosubstitution indicate that the Ce 4+ ions of smaller size are substituted for the Bi 3+ ions.…”

Section: Raman and Ftir Spectroscopiesmentioning

confidence: 68%

“…These easily can cover the presence of low-level impurities. whereas the A1-3, and A1-4 modes show weak scattering intensities [32][33][34][35][36][37]. By comparison, the scattering intensity of nine E modes is medium.…”

Section: Raman and Ftir Spectroscopiesmentioning

confidence: 99%

Hydrothermal synthesis of Ce/Zr co-substituted BiFeO3: R3c-to-P4mm phase transition and enhanced room temperature ferromagnetism

Adineh

Gholizadeh

2021

J Mater Sci: Mater Electron

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A facile hydrothermal method was used for fabricating phase-pure Bi1-xCexFe1-xZrxO3 (x = 0.00, 0.03, 0.06) multiferroic ferrites, and the dependence of structural, optical, and magnetic properties on the composition have been investigated. The samples were investigated by X-ray diffraction (XRD), Raman and Fourier-transform infrared (FT-IR) spectroscopies, scanning electron microscopy, UV-Vis spectroscopy, and vibrating sample magnetometer at room temperature. Structural results show that the structure of Bi1-xCexFe1-xZrxO3 ferrites is indexed to a rhombohedral structure with R3c space group. However, the weakening in the intensity, the expansion of the line-width of all bands, and some band shifts observed in Raman spectra indicate a structural transition from rhombohedral (R3c) to pseudo-tetragonal (P4mm) phase as the content of Ce/Zr increases. Also, a significantly enhanced intensity of the A1-2 mode in Raman spectra means that there is a novel behavior of magnetic anisotropy in the Ce/Zr cosubstituted samples. A significant increase in optical band gap with increasing of the Ce/Zr cosubstitution suggests that the materials are suitable for technological applications. Magnetic properties of the samples show a magnetic transition from antiferromagnetic to ferromagnetic phase due to the presence of the rhombohedral to the tetragonal phase transition, and exchange interaction between the 4f orbitals of the Ce 3+ /Ce 4+ and the 3d orbitals of the Fe 3+ /Fe 2+ .

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“…The Fe2p 3/2 and Fe2p 1/2 spin-orbit doublet peaks are located around 709.6 eV and 722.9 eV, respectively, with a pair of shake-up satellite peaks [18] located at 8.0 eV above their spin-orbit doublet peaks. We have carefully fitted the spectra using the following fitting parameters for the Fe 2+ : spin-orbit splitting 13.3 eV, branching ratio 2.0, full widths at half maximum (FWHM) 2.3 eV; an integral background was subtracted before fitting.…”

Section: Resultsmentioning

confidence: 98%

Nonmonotonic magnetic field dependence of remanent ferroelectric polarization in reduced-graphene-oxide-BiFeO$_3$ nanocomposite

Chatterjee,

Mukherjee,

Pal

et al. 2021

Preprint

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In a nanocomposite of reduced graphene oxide (RGO) and BiFeO3 (BFO), the remanent ferroelectric polarization is found to follow nonmonotonic magnetic field dependence at room temperature as the applied magnetic field is swept across 0-20 kOe on a pristine sample. The remanent ferroelectric polarization is determined both from direct electrical measurements on an assembly of nanoparticles and powder neutron diffraction patterns recorded under 0-20 kOe field. The nanosized (∼20 nm) particles of BFO are anchored onto the graphene sheets of RGO via Fe-C bonds with concomitant rise in covalency in the Fe-O bonds. The field-dependent competition between the positive and negative magnetoelectric coupling arising from magnetostriction due to, respectively, interface and bulk magnetization appears to be giving rise to the observed nonmonotonic field dependence of polarization. The emergence of Fe-C bonds and consequent change in the magnetic and electronic structure of the interface region has influenced the coupling between ferroelectric and magnetic properties remarkably and thus creates a new way of tuning the magnetoelectric properties via reconstruction of interfaces in nanocomposites or heterostructures of graphene/single-phase-multiferroic systems.

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Substitution driven structural and magnetic properties and evidence of spin phonon coupling in Sr-doped BiFeO₃ nanoparticles

Abstract: The manifestation of dimensionalities and Sr induced modifications in structural, vibrational and magnetic properties of Bi1−xSrxFeO3; (x = 0–0.25) nanoparticles synthesized by a tartaric acid based sol–gel route are reported.

Cited by 38 publications

References 68 publications

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Hydrothermal synthesis of Ce/Zr co-substituted BiFeO3: R3c-to-P4mm phase transition and enhanced room temperature ferromagnetism

Nonmonotonic magnetic field dependence of remanent ferroelectric polarization in reduced-graphene-oxide-BiFeO$_3$ nanocomposite

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Substitution driven structural and magnetic properties and evidence of spin phonon coupling in Sr-doped BiFeO3 nanoparticles

Abstract: The manifestation of dimensionalities and Sr induced modifications in structural, vibrational and magnetic properties of Bi1−xSrxFeO3; (x = 0–0.25) nanoparticles synthesized by a tartaric acid based sol–gel route are reported.

Cited by 38 publications

References 68 publications

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Hydrothermal synthesis of Ce/Zr co-substituted BiFeO3: R3c-to-P4mm phase transition and enhanced room temperature ferromagnetism

Nonmonotonic magnetic field dependence of remanent ferroelectric polarization in reduced-graphene-oxide-BiFeO$_3$ nanocomposite

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Substitution driven structural and magnetic properties and evidence of spin phonon coupling in Sr-doped BiFeO₃ nanoparticles