Electrical permittivity of Ni and NiZn ferrite–polymer composites

Razzitte, A.C.; Fano, Walter Gustavo; Jacobo, Silvia E.

doi:10.1016/j.physb.2004.09.054

Cited by 30 publications

(11 citation statements)

References 5 publications

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“…15 Zn 0.5 Fe 2 O 4 ferrites were prepared by the selfcombustion method [6]. Different proportions of iron nitrates, nickel, cooper, and zinc oxalates were weighed according to the required stoichiometric proportion and diluted in water (in all .…”

Section: Methodsmentioning

confidence: 99%

“…The presence of Cu + ions near the grain boundaries causes a decrease of the lattice parameters of the sample M-IV sintered at 1100ºC in Table 1. The grain size continues to rise from about 12 nm to 115 nm while increasing the sintering temperature that is also much larger than that of NiZn ferrite prepared through the same fabrication process [5,6,17]. In this case a liquid phase sintering takes place when the material transfer is much faster than in solid phase.…”

Section: Trends In Magnetismmentioning

confidence: 95%

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Structural and Magnetic Properties of Nanoparticles of NiCuZn Ferrite Prepared by the Self-Combustion Method

Jacobo

Aphesteguy

Shegoleva

et al. 2010

SSP

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Abstract. NiCuZn ferrites were prepared by the sol-gel self-combustion method. Nanosized, homogeneous and highly reactive powders were obtained at relatively low temperatures. In present work the variations of structural, magnetic, and microwave properties of NiCuZn ferrite nanoparticles were studied as a function of the annealing temperature. The analysis of XRD patterns showed that only the spinel phase is present. Cell parameters slightly vary with thermal treatment while a crystalline size increases. Magnetic nanoparticles were mixed with an epoxy resin for reflectivity studies with a microwave vector network analyzer using the microwave-guide method in the range of 7.5 to 13.5GHz. Static saturation magnetization value (measured by SQUID) and microwave absorption show clear dependence on the annealing temperature/particle size and the absorption maximum moves towards the higher frequencies with an increase in the average size of the particles.

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Section: Methodsmentioning

confidence: 99%

Section: Trends In Magnetismmentioning

confidence: 95%

Structural and Magnetic Properties of Nanoparticles of NiCuZn Ferrite Prepared by the Self-Combustion Method

Jacobo

Aphesteguy

Shegoleva

et al. 2010

SSP

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“…It should be noted that the real permittivity increases slightly with frequency increased, which is contrary to the ordinary frequency dispersion effect described by the Debye model. [31][32][33][34][35][36][37] In order to further expound this peculiar frequency dispersion characteristic, it is essential to explore the details of electronic polarizing processing Si 3 N 4 ceramics. Considering the covalent bonding, the electronic polarization in Si 3 N 4 ceramic mainly results from the bound charge's displacement deviated from the equilibrium position.…”

Section: B Temperature-dependent Dielectric Responsesmentioning

confidence: 99%

Effect of temperature on dielectric response in X-band of silicon nitride ceramics prepared by gelcasting

et al. 2018

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Due to the drastic aerodynamic heating effect in supersonic aircrafts, the operational performance of wave-transmitting dielectric ceramics functionalized radomes strongly depends on the temperature and oxidation. In this paper, the evolution of microwave dielectric responses in Si3N4 ceramics via gelcasting over a wide temperature range (25°C∼800°C) is investigated experimentally and theoretically. Specifically, the relative increment rate of real permittivity over evaluated temperature range is 4.46% at 8.2GHz and 8.67% at 12.4GHz, while the imaginary permittivity remains less than 0.06. Taking temperature-dependent polarized bound charge and damping coefficient into consideration, a revised dielectric relaxation model with Lorentz correction for Si3N4 ceramics has been established, which agrees well with evolution of experimental results. Furthermore, the best fitting results indicate that the activation energy of electrons Ea (15.46 ∼17.49 KJ/mol) is less than that of lattice Eb (33.29∼40.40 KJ/mol), which could be ascribed to the binding force between the electrons and nucleus is lower than covalent bonding force of lattice. Besides, excellent restorable feature of permittivity after heat-treatment lays a solid foundation for radome materials serviced in high temperature circumstances.

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“…In the frequency range from RF to microwaves, the magnetic susceptibility spectra of the ferrite can be characterized by the different magnetizing mechanisms, domain wall motion and gyromagnetic spin rotation [8]. So, magnetic susceptibility w can be expressed as the contribution of two terms, gyromagnetic spin w s and domain wall w d [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic susceptibility of MnZn and NiZn soft ferrites using Laplace transform and the Routh–Hurwitz criterion

Fano

Boggi

Razzitte

2011

Journal of Magnetism and Magnetic Materials

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Electrical permittivity of Ni and NiZn ferrite–polymer composites

Cited by 30 publications

References 5 publications

Structural and Magnetic Properties of Nanoparticles of NiCuZn Ferrite Prepared by the Self-Combustion Method

Structural and Magnetic Properties of Nanoparticles of NiCuZn Ferrite Prepared by the Self-Combustion Method

Effect of temperature on dielectric response in X-band of silicon nitride ceramics prepared by gelcasting

Magnetic susceptibility of MnZn and NiZn soft ferrites using Laplace transform and the Routh–Hurwitz criterion

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