Large magnetoelectric properties in CoFe2O4:BaTiO3 core–shell nanocomposites

Chaudhuri, Arka; Mandal, Kalyan

doi:10.1016/j.jmmm.2014.10.142

Cited by 86 publications

(29 citation statements)

References 17 publications

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“…Further, in polymer-based ME materials strain coupling does not deteriorate with operation, as the magnetostrictive material is in direct contact with and completely surrounded by the piezoelectric polymer matrix, they show simple and scalable production methods, a flexible structure without large leakage currents, can be fabricated by conventional low-temperature polymer processing into a variety of forms, such as thin sheets or molded shapes, can exhibit tailored mechanical properties, flexibility, lightweight, versatility, low cost and in biocompatibility 1, 2 . In particular, polymer-based ME spheres composed by magnetostrictive nanoparticles within a piezoelectric polymer matrix, can open new applications areas and solve some drawbacks of the traditional polymer-based structures (nanocomposites, polymer as a binder and laminates) such as agglomeration, irregular distributions and the difficulty to shape in a miniaturized form 1,12 . Polymer-based micro and nanospheres undergo an increasing demand and applicability as biomaterials for cell culture, drug delivery systems, electro-optic and luminescent devices, heterogeneous catalysis and polymer powder impregnation of inorganic fibers in composites [13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Development of magnetoelectric CoFe₂O₄ /poly(vinylidene fluoride) microspheres

et al. 2015

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Magnetoelectric microspheres based on piezoelectric poly(vinylidene fluoride) (PVDF) and magnetostrictive CoFe 2 O 4 (CFO), a novel morphology for polymer-based ME materials, have been developed by an electrospray process. The CFO nanoparticle content in the (3-7 mm diameter) microspheres reaches values up to 27 wt%, despite their concentration in the starting solution reaching values up to 70 wt%. Additionally, the inclusion of magnetostrictive nanoparticles into the polymer spheres has no relevant effect on the piezoelectric b-phase content (z60%), crystallinity (40%) and the onset degradation temperature (460-465 C) of the polymer matrix. The multiferroic microspheres show a maximum piezoelectric response |d33| z 30 pC N1, leading to a magnetoelectric response of D|d33| z 5 pC N1 obtained when a 220 mT DC magnetic field was applied. It is also shown that the interface between CFO nanoparticles and PVDF (from 0 to 55%) has a strong influence on the ME response of the microspheres. The simplicity and the scalability of the processing method suggest a large application potential of this novel magnetoelectric geometry in areas such as tissue engineering, sensors and actuators. Magnetoelectric microspheres based on piezoelectric poly(vinylidene fluoride) (PVDF) and magnetrostrictive CoFe 2 O 4 (CFO), a novel morphology for polymer-based ME material, have been developed by an electrospray process. The CFO nanoparticles content in the (3 -7 µm diameter) microspheres reaches values up to 27 wt.%, despite their concentration in the starting solution reaching values up to 70 wt.%. Additionally, the inclusion of magnetostrictive nanoparticles into the polymer spheres has no relevant effect on the piezoelectric β-phase content (≈60%), crystallinity (40%) and the onset degradatio n temperature (460º-465ºC) of the polymer matrix. The multiferroic microspeheres show a maximum piezoelectric reponse |d33|≈30 pC.N -1 , leading to a magnetoelectric response of ∆|d33|≈5 pC.N -1 obtained when a 220 mT DC magnetic field was applied. It is also shown that the interface between CFO nanoparticles and PVDF (from 0 to 55%) has a strong influence on the ME response of the microspheres. The simplicity and the scalability of the processing method suggest a large application potential of this novel mag netoelectric geometry in areas such as tissue engineering, sensors and actuators.

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Section: Introductionmentioning

confidence: 99%

Development of magnetoelectric CoFe₂O₄ /poly(vinylidene fluoride) microspheres

et al. 2015

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“…And the polarization is higher than the polarization reported in the CFO-PZT core-shell structure [26]. This is because the enhanced polarization in the core-shell composite can be attributed to the large leakage current density caused by the space charge effect [28,29]. In addition to the sample (1:6), the coercive field of other proportions of ceramics decreases as the FE phase increases.…”

Section: Ferroelectric Propertiesmentioning

confidence: 79%

“…In order to achieve strong magnetoelectric coupling effect, it is necessary to improve the magnetic/ferroelectric properties under the action of an electric/magnetic field. It has been found that by adjusting the composition of the composite material, the magnetic/ferroelectric properties can be effectively adjusted to improve the magnetoelectric coupling coefficient [22][23][24][25][26][27][28]. Till now, several composite materials have been studied, including Co 0.5 Ni 0.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on the structural, dielectric, ferroelectric and magnetic properties of CoFe₂O₄/PbZr_0.52Ti_0.48O₃ multiferroic composite with different molar ratios

Gao

et al. 2019

J. Phys. Commun.

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Magnetoelectric composites have attracted much attentions due to their excellent multiferroic properties at room temperature. In this paper, CoFe 2 O 4 -PbZr 0.52 Ti 0.48 O 3 (CFO-PZT) composite ceramics with different molar ratios (CFO/PZT=1:4, 1:5, 1:6 and 1:7) were prepared by conventional solid reaction method. Effects of molar ratio on the structure, dielectric, ferroelectric and magnetic properties were comparatively investigated. X-ray diffraction patterns confirmed biphase structures of the composites, which can be indexed as CFO and PZT, no other obvious phase can be found with the limitation of the XRD resolution. Scanning electron microscopy (SEM) images show that the surface of the prepared samples is not dense enough and many pores are formed, the mean grain size is about 200 nm. The same relaxation behavior was observed in the intermediate temperature range of PZT-CFO composite ceramics. At room temperature, the dielectric constant and dielectric loss of the specimen 1:4 are the highest. The leakage current of the sample 1:4 is the lowest while the sample 1:6 has the largest value. As the CFO content in the composite decreases, both the saturation (Ms) and the remnant (Mr) magnetization decrease. Among them, the sample 1:4 presents better ferroelectric and magnetic properties, the remnant polarization is 1.13 μC cm −2 , the saturation magnetization and remnant magnetization are 11.01 and 3.28 emu g −1 , respectively. The sample 1:6 has the largest coercive field (945.27 Oe) while the sample 1:7 show the smallest value (681.19 Oe). Interface interaction between CFO/PZT may be applied to explain this phenomenon.

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“…It was observed that the mixed oxide with Fe/Ce = 1 resulted in 13 % removal of phenol, 93 % removal of methylene blue and almost complete removal of congo red. The higher photocatalytic activity of the mixed oxide was attributed to its higher surface area and surface acidity, which determine the active sites of the photocatalyst thus accelerating the photocatalytic reaction [40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Mechanism of ZnFe2O4/ZnO Nanopowder in Photocatalytic Degradation of Acid Orange 7

Ahmed¹,

Chandrasekhar²,

Jahagirdar³

et al. 2018

Asian J. Chem.

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ZnFe2O4/ZnO nanopowder was prepared by solution combustion method. The characterization of the nanopowder was done by powder X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. Powder X-ray diffraction pattern of the nanopowder exhibited the spinel phase of zinc ferrite and wurtzite phase of zinc oxide. The nanopowder was used for the photocatalytic removal of acid orange dye 7 from its aqueous solution. The effect of various factors such as initial dye concentration, dosage of the photocatalyst and irradiation time was studied. An analysis of the results indicated that the dye degradation was more in case of 10 and 20 ppm dye solutions. The dye degradation decreased with increasing initial concentration. ZnFe2O4/ZnO can be used as a better photocatalyst for the removal of dyes from their aqueous solutions.

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Large magnetoelectric properties in CoFe2O4:BaTiO3 core–shell nanocomposites

Cited by 86 publications

References 17 publications

Development of magnetoelectric CoFe₂O₄ /poly(vinylidene fluoride) microspheres

Development of magnetoelectric CoFe₂O₄ /poly(vinylidene fluoride) microspheres

A comparative study on the structural, dielectric, ferroelectric and magnetic properties of CoFe₂O₄/PbZr_0.52Ti_0.48O₃ multiferroic composite with different molar ratios

Synergistic Mechanism of ZnFe2O4/ZnO Nanopowder in Photocatalytic Degradation of Acid Orange 7

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Large magnetoelectric properties in CoFe2O4:BaTiO3 core–shell nanocomposites

Cited by 86 publications

References 17 publications

Development of magnetoelectric CoFe2O4 /poly(vinylidene fluoride) microspheres

Development of magnetoelectric CoFe2O4 /poly(vinylidene fluoride) microspheres

A comparative study on the structural, dielectric, ferroelectric and magnetic properties of CoFe2O4/PbZr0.52Ti0.48O3 multiferroic composite with different molar ratios

Synergistic Mechanism of ZnFe2O4/ZnO Nanopowder in Photocatalytic Degradation of Acid Orange 7

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Product

Resources

About

Development of magnetoelectric CoFe₂O₄ /poly(vinylidene fluoride) microspheres

Development of magnetoelectric CoFe₂O₄ /poly(vinylidene fluoride) microspheres

A comparative study on the structural, dielectric, ferroelectric and magnetic properties of CoFe₂O₄/PbZr_0.52Ti_0.48O₃ multiferroic composite with different molar ratios