DC conductivity and magnetic properties of piezoelectric–piezomagnetic composite system

Hemeda, O. M.; Tawfik, A.; A-Al-Sharif,; Amer, M.A.; Kamal, Babar; Refaay, D.E. El; Bououdina, M.

doi:10.1016/j.jmmm.2012.07.028

Cited by 21 publications

(6 citation statements)

References 11 publications

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“…According to the dielectric measurement result, the electrical conductivity of pure HBP is 2.36×10 -7 S/m at 100 Hz, which is much higher than that of the BT nanoparticles reported in the literature. 50 Higher surface electrical conductivity of the BT-HBP can cause higher magnitude of interfacial polarization, which in turn results in high dielectric constant at BT-HBP nanocomposites. Interfacial polarization only occurs at low frequencies, and thus the lower dielectric constant of BT-HBP nanocomposites can be explained by the lower dielectric constant of HBP grafted on the surface of BT nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO₃ Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Xie

Huang

et al. 2013

ACS Appl. Mater. Interfaces

166

117

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Polymer nanocomposites with the dielectric constant comparable to that of percolative composites are successfully prepared by using core-shell structured hyperbranched aromatic polyamide grafted barium titanate (BT-HBP) hybrid nanofiller. Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (PVDF-TrFE-CFE) was used as the polymer matrix because of its high intrinsic dielectric constant and easy processability. The BT-HBP hybrid nanofiller were prepared by a solution polymerization of diaminobenzoic acid on the surface of amino-funcationalized BT nanoparticles. Nuclear magnetic resonance ((1)H NMR) and transmission electron microscopy (TEM) were used to verify the chemical structure of the hyperbranched aromatic polyamide and core-shell structure of the hybrid filler, respectively. It was found that the nanocomposite with 40 vol % BaTiO3-HBP had a dielectric constant of 1485.5 at 1000 Hz, whereas the corresponding nanocomposite sample with untreated BaTiO3 only showed a dielectric constant of 206.3. Compared with classic percolative composites, the advantage of the PVDF-TrFE-CFE/BaTiO3-HBP nanocomposites is that the composites show high enough breakdown strength and high dielectric constant simultaneously. An enhanced interfacial polarization mechanism between the BT-HBP and the polymer matrix was suggested for understanding the observed unusually high dielectric constant.

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Section: Methodsmentioning

confidence: 99%

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO₃ Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Xie

Huang

et al. 2013

ACS Appl. Mater. Interfaces

166

117

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“…An RLC bridge type BM-591 was used for the measurement of DC resistivity and permeability for the prepared BT+NZF composite at 1 KHz. More details about the system are reported in a previous study [5]. The DC electrical resistivity measurements were performed after coating the samples uniformly with silver paste.…”

Section: Characterizationsmentioning

confidence: 99%

Enhancement of electrical and magnetic properties of nanocomposite BaTiO3 - NiZnFe2O4 irradiated by Gamma ray

Henaish

Elrefaey

Ashour³

et al. 2019

Arab Journal of Nuclear Sciences and Applications

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The effects of gamma ray irradiation on the, microstructural and magnetic properties of the composite (1-x) (Ni 0.8 Zn 0.2 Fe 2 O 4) + x (BaTiO 3) where x = 0%, 20%, 40%, 60% and 80% BT content have been investigated. All samples were exposed to 310 kGy gamma radiation dose at a dose rate of 1.4 kGy/h at room temperature using 60 Co radioactive source at irradiation cell (medical sterilizer type CM-20). From X-ray diffraction analysis, it was found obviously that the lattice parameters and the average grain size have been affected, for all irradiated samples. The initial permeability at Curie temperature for all samples sharply decreased after irradiation. The values of diffusion coefficient of oxygen vacancies, the concentration of oxygen vacancies and the activation energy of diffusion process were calculated before and after irradiation. From the results, it could be concluded that the material after irradiation can be used for the Gamma ray detection.

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“…The behavior of the present result is in agreement to those in previous work. These composites can be used as sensor in detecting electromagnetic waves [29] [30].…”

Section: The Effect Of Magnetizationmentioning

confidence: 99%

Electric and Magnetic Properties of [(NCZF)<sub>1-x</sub>(Na(ac.ac))<sub>x</sub>] Nanocomposite

Hemeda¹,

Tawfik²,

Refaey³

et al. 2017

OJAppS

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The pure spinel phase of Ni 0.45 Co 0.2 Zn 0.35 F 2 O 4 [NCZF] was prepared by coprecipitation method. The nanocomposite [(NCZF) 1−x (Na(ac.ac)) x ] (x = 0%, 20%, 40%, 60%, 80%, 100%) was prepared by mixing two phases: ferrite phase and ferroelectric phase. The magnetic characters of composites performed using vibrating sample magnitude (VSM) at room temperature with maximum applied field up to 2 kG. For smaller particle size < 30.89 nm, the coercivity increases rapidly with increasing particle size and reaching maximum value of 99.9 G at 30.89 nm and then decrease with particle size for lager particles >30.89 nm. The saturation magnetization Ms decreases linearly with increasing particle size. The effect of temperature on the electrical resistivity of the different composites samples was studied. It is noted that, the resistivity decreases with rising temperature to have a minimum value at ferroelectric transition temperature, above this value the resistivity increases. The dielectric constant increases with increasing temperature for all composites. The dielectric loss tan (δ) as a function of temperature sharply with temperature reached to maximum value at ferroelectric phase transition then decrease again.

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DC conductivity and magnetic properties of piezoelectric–piezomagnetic composite system

Cited by 21 publications

References 11 publications

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO₃ Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO₃ Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Enhancement of electrical and magnetic properties of nanocomposite BaTiO3 - NiZnFe2O4 irradiated by Gamma ray

Electric and Magnetic Properties of [(NCZF)<sub>1-x</sub>(Na(ac.ac))<sub>x</sub>] Nanocomposite

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DC conductivity and magnetic properties of piezoelectric–piezomagnetic composite system

Cited by 21 publications

References 11 publications

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO3 Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO3 Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Enhancement of electrical and magnetic properties of nanocomposite BaTiO3 - NiZnFe2O4 irradiated by Gamma ray

Electric and Magnetic Properties of [(NCZF)&lt;sub&gt;1-x&lt;/sub&gt;(Na(ac.ac))&lt;sub&gt;x&lt;/sub&gt;] Nanocomposite

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Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO₃ Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Core-shell Structured Hyperbranched Aromatic Polyamide/BaTiO₃ Hybrid Filler for Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) Nanocomposites with the Dielectric Constant Comparable to That of Percolative Composites

Electric and Magnetic Properties of [(NCZF)<sub>1-x</sub>(Na(ac.ac))<sub>x</sub>] Nanocomposite