Functional properties of percolative CoFe2O4-PbTiO3 composite ceramics

Ciomaga, Cristina Elena; Airimioaei, Mirela; Turcan, Ina; Lukacs, Alexandru V.; Tascu, Sorin; Grigoraş, M.; Lupu, N.; Banys, J.; Mitoşeriu, Liliana

doi:10.1016/j.jallcom.2018.10.088

Cited by 25 publications

(6 citation statements)

References 60 publications

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“…In fact, these oxygen vacancies serve as centers for electron (e À ) trapping and are crucial in lowering the rate at which photo-induced bearers of charge (e À and h) recombine, hence enhancing the photocatalytic activity of ferrites. [20] The creation of more oxygen vacancies in nano-MnCuZnFe 2 O 4 results in a reduced electron-hole (e À -h) separation efficiency because these vacancies can trap more carriers. This increases the nano-ferrite powders' photo-catalytic activity.…”

Section: (B)) Direct Optical Band Gaps (E G )mentioning

confidence: 99%

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe₂O₄ Nanoparticles

Surendra Babu,

Bhonsle,

H.V.

et al. 2024

ChemistrySelect

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The Mn0.92Cu0.08‐yZnyFe2O4 (y=0.02, 0.04, 0.06 and 0.08) nanoparticles (MCZF NPs) were synthesized via the hydrothermal process at low operating temperature. The MCZF system generated a cubic spinel structure as seen by the X‐ray diffraction patterns. The average crystallite size was observed to be increasing from 25 to 30 nm. The broad (γ1) and narrow (γ2) absorption bands were seen in FTIR spectra and the cation distributions at tetrahedral (A) and octahedral (B) sites, respectively, was indicated. The surface morphology was analyzed using electron microscopy. Clarification was provided for the dependence of the optical bandgap shift (Eg~1.96–2.15 eV) on the concentration of substituent. The superparamagnetic nature of MCZF can be advantageous for biomedical applications and it was demonstrated by the magnetization versus applied magnetic field (M−H) loops. Small values of remanence magnetization (Mr) and coercivity (Hc) were found using magnetization versus magnetic field (M−H) curves at y=0.02, 0.04, 0.06, and 0.08. This proved that MCZF NPs exhibited the superparamagnetic behavior. The cation distribution at two sublattices was also estimated using a two‐sublattice model. The greatest zone of inhibition in an antibacterial study of MCZF (produced by the green method) was 10.8 mm for Pseudomonosa aeruginosa and 9.4 mm for Staphylococcus aureus.

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Section: (B)) Direct Optical Band Gaps (E G )mentioning

confidence: 99%

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe₂O₄ Nanoparticles

Surendra Babu,

Bhonsle,

H.V.

et al. 2024

ChemistrySelect

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“…This displacement may change the size of the cell or cause anisotropic local strain, which may lead to changes in the intensity of the diffraction peaks. When the PTO mole amount increases to x = 0.4 and 0.5, the ceramic system becomes stabled and the diffraction peak strength increased [17,18]. At the same time, when the PTO mole amount is increased, the increase of lead (Pb 2+ ) can restore the A ion stated and enhanced the diffraction peaks of the crystal surface [9,19].…”

Section: Structural Characterizationmentioning

confidence: 99%

“…Ferroelectric phase materials are usually selected with good piezoelectric properties and high Curie temperature, while ferromagnetic phase materials are selected with strong magnetostrictive effect. PbTiO 3 (PTO) is a typical piezoelectric material with high Curie ferroelectric temperature (T C ∼ 490°C), In addition, it has important applications in electronic devices because of its high thermoelectric coefficient (250 µC/cm 2 K) and low dielectric constant [17]. NiFe 2 O 4 (NFO) is an inverse spinel ferrite with high Curie temperature (T C ∼ 550°C) [7].…”

Section: Introductionmentioning

confidence: 99%

Structure, dielectric, magnetic and magnetoelectric coupling properties of xPbTiO3/(1-x)NiFe2O4 composite ceramics

Zeng¹,

Xu²,

Cheng³

et al. 2020

PAC

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In this paper, xPbTiO 3 /(1-x)NiFe 2 O 4 (PTO/NFO, x = 0.1, 0.2, 0.3, 0.4 and 0.5) ceramic composites were prepared by mixing of sol-gel synthesized PTO and NFO powders, followed by their uniaxial pressing and sintering at 1150°C. The effects of PTO/NFO composition on crystal structure, surface morphology, electrical, magnetic and magnetoelectric coupling properties were studied. XRD results showed that the prepared ceramics contain only PTO and NFO phases without any impurity phase. The samples were relatively dense while the grains were evenly distributed. The dielectric constant and loss varied monotonically with the frequency for different molar ratios. The hysteresis loop of the composites with high amount of high resistance NFO phase (x = 0.1, 0.2) has the shape characteristic for a material with large leakage current. The samples with x = 0.1 showed the largest saturated magnetization, while the sample with x = 0.2 had the maximum remnant magnetization. It was also shown that the polarization was affected by the external magnetic field of 1 mT and the strongest ME coupling (relative polarization change of 15.4%) was observed for the 0.5PbTiO 3 /0.5NiFe 2 O 4 composite. In addition, the relevant calculation showed that the leakage mechanism may not be the main factor affecting the polarization of the obtained ceramics.

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“…The PTO is corresponding to standard card PDF#75-1605 (space group P4mm), and the NFO is corresponding to standard card PDF#74-2081 (space group Fd-3 m), shows that there is no obvious chemical reaction between the PTO and NFO in the prepared composite ceramics with the limitation of XRD resolution. Also, when the sintering temperature is 1050 °C, a obvious impurity peak can found, which is indexed as PbO 2 , this induced impurity may be because with the increase of sintering temperature, the concentration of Pb 2+ ions in the system gradually increased and then the reaction produced PbO 2 impurity peak, when the temperature further increased, the reaction of Pb 2+ ions in the system was completed, the existence of impurity may change the ceramic properties [16,22]. Figure 2 shows the SEM image of PTO/NFO composite ceramics with different sintering temperatures.…”

Section: Characterizationmentioning

confidence: 99%

“…In previous studies, the selection of ferroelectric phase materials mainly includes differently doped or undoped Pb(Zr, Ti)O 3 [3,15]. In this study, PbTiO 3 was selected as the ferroelectric phase and NiFe 2 O 4 was used as the magnetic phase, this is because PTO is a typical piezoelectric material, besides it has the advantages of high Curie temperature (T C~4 90 °C), high thermoelectric coefficient (~250 μC/cm 2 K) [16], etc. NFO is an anti-spinel ferrite with high Neel temperature (T N~5 50 °C), which is a typical soft magnet, with high saturated magnetization and high resistivity [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on magnetoelectric properties of PbTiO₃/NiFe₂O₄ composite ceramics

Zeng

Zhou

et al. 2020

Journal of Asian Ceramic Societies

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Magnetoelectric composites have attracted much attention due to their strong magnetoelectric coupling effect. In this paper, PbTiO 3-NiFe 2 O 4 (PTO/NFO) composite ceramics were prepared by sol-gel method. Effect of sintering temperatures on the structure, dielectric properties and multiferroic properties were studied. XRD results show that PTO/NFO ceramics have been successfully prepared. When the sintering temperature is 1050 °C, the secondary phase PbO 2 exists in the ceramics. SEM results show that there were two kinds of grains with different sizes. EDS analysis suggested that the large particles are NFO and the small particles are PTO. The sintering temperature has a great influence on the dielectric and ferroelectric properties of the prepared ceramics. When the sintering temperature is 950 °C, the ceramics show the maximum dielectric constant at low frequency. When the sintering temperature is 1150 °C, the maximum residual polarization is 1.236 μC/cm 2. The conductive mechanism of ceramics is dominated by Space Charge-Limited Conduction. The remanent magnetization and coercive field decrease with increasing the sintering temperature. The magnetoelectric coupling coefficient shows that ceramics have strong magnetoelectric coupling performance (5.7 V/cm•Oe).

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Functional properties of percolative CoFe2O4-PbTiO3 composite ceramics

Cited by 25 publications

References 60 publications

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe₂O₄ Nanoparticles

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe₂O₄ Nanoparticles

Structure, dielectric, magnetic and magnetoelectric coupling properties of xPbTiO3/(1-x)NiFe2O4 composite ceramics

Effect of sintering temperature on magnetoelectric properties of PbTiO₃/NiFe₂O₄ composite ceramics

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Functional properties of percolative CoFe2O4-PbTiO3 composite ceramics

Cited by 25 publications

References 60 publications

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe2O4 Nanoparticles

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe2O4 Nanoparticles

Structure, dielectric, magnetic and magnetoelectric coupling properties of xPbTiO3/(1-x)NiFe2O4 composite ceramics

Effect of sintering temperature on magnetoelectric properties of PbTiO3/NiFe2O4 composite ceramics

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Product

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Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe₂O₄ Nanoparticles

Magnetic, Optical, Electrical and Antimicrobial Properties of MnCuZnFe₂O₄ Nanoparticles

Effect of sintering temperature on magnetoelectric properties of PbTiO₃/NiFe₂O₄ composite ceramics