The influence of Nd substitution in Ni–Zn ferrites for the improved microwave absorption properties

Qian, Kun; Yao, Zhengjun; Hu, Lin; Zhou, Jintang; Haidry, Azhar Ali; Qi, Tongbaihui; Chen, Wenjing; Guo, Xinlu

doi:10.1016/j.ceramint.2019.08.255

Cited by 125 publications

(23 citation statements)

References 34 publications

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“…The Cole-Cole semicircles derived from the plots of ε' versus ε" represent Debye relaxation process to confirm the polarization relaxation behaviors. On the basis of classical Debye theory, the relationship between ε' and ε" may be described below [22]…”

Section: Resultsmentioning

confidence: 99%

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Zhang

et al. 2021

J Mater Sci: Mater Electron

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In this article, spinel ferrite CoFe2O4 and multi-walled carbon nanotubes (MWCNTs) composites are constructed by a facile one-step solvothermal method.The pure phase of CoFe2O4 particles is confirmed by X-ray diffraction patterns.Microstructure analysis demonstrates that monodisperse CoFe2O4 microspheres are wound by MWCNTs. By the introduction of CNTs, there is a significant enhancement in the imaginary part of permittivity (ε″) with the composites. The champion microwave absorption performance can be achieved in the composites by the balance of complex permittivity and permeability. When the mass fraction of CNTs is 3%, a minimum reflection loss (RLmin) of the composites is as high as -46.65 dB at 14.4GHz at a thin thickness of 1.5 mm, and the corresponding effective absorption bandwidth below -10 dB reaches 4.91 GHz ranging from 12.41 to 17.32 GHz which covers almost the whole Ku band (12.0-18.0 GHz). In other words, this as-synthesized composites show the most outstanding specific RLmin of -31.1 dB•mm -1 . Such superior microwave absorption behaviors of CoFe2O4/CNTs originate mainly from multiple dielectric relaxation processes, enhanced impedance matching and magnetic loss, as well as the considerable interface between mesoporous CoFe2O4 hollow microspheres and CNTs, and thereby promoting microwave reflection and scattering within the samples. Our results indicate that as-fabricated CoFe2O4/CNTs composites can be a promising microwave absorbent integrating with thin thickness, strong absorption ability, and broad bandwidth absorption.

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Section: Resultsmentioning

confidence: 99%

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Zhang

et al. 2021

J Mater Sci: Mater Electron

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“…There are some problems with the development of technology. One of such problems are the disturbances and electromagnetic radiation that affect human health and the environment [1][2][3][4]. In order to counteract the negative effects of such an impact, research is conducted to enable the development of materials that absorb electromagnetic waves [5].…”

Section: Introductionmentioning

confidence: 99%

Methods of Assessing the Effectiveness of Filter Elements in Power Electronics

Borecki

Sroka

2022

Energies

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Newly constructed devices must meet a number of requirements in terms of the level of generated disturbances. To achieve an acceptable level in such devices, filters are installed—one of the cheapest ways to reduce interference in devices. One of the key elements of the filter that is responsible for the effectiveness of noise reduction are ferrites. Unfortunately, for various devices, an individual approach should be used in the selection of filters and, accordingly, ferrites. Due to the fact that ferrites from different manufacturers do not have standardized characteristics and information on their effectiveness, the selection of the right ferrite is a very time-consuming process. Therefore, this article will present the possibilities of quickly determining selected ferrite parameters in order to ensure the necessary level of noise reduction. For this purpose, assumptions from the CISPR 17 standard will be used. For selected types of ferrites, a large number of measurements were carried out in order to determine the optimal computational algorithm for adjusting ferrite characteristics to the designed conditions. The performance of these tests will be the basis for conducting tests on a larger number of ferrites, as well as for the development of possible standardization procedures.

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“…At x = 0.05, the dielectric loss reached the lowest value. Qian and co-workers 39 investigated the influence of Nd 3+ substitution for Ni–Zn spinels and established the improvement of microwave absorption. Nanocrystalline Ni 0.5 Zn 0.5 Nd x Fe 2– x O 4 ferrites were synthesized by a sol–gel route combined with a self-propagating combustion method.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dy³⁺Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni_0.4Cu_0.2Zn_0.4](Fe_2–xDy_x)O₄(0.00 ≤x≤ 0.04) Spinel Ferrites

et al. 2021

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[Ni 0.4 Cu 0.2 Zn 0.4 ](Fe 2– x Dy x )O 4 spinel ferrite nanoparticles with different Dy 3+ concentrations (0.00 ≤ x ≤ 0.04) were prepared by a citrate sol–gel auto-combustion technique. A strong correlation among Dy concentration, structural parameters, and magnetic, electrical, and microwave properties was established. An increase in the Dy 3+ concentration is the reason for a rise in the crystal structure parameters (due to different ionic radii of Fe and Dy ions) and a slight increase in the average particle size with a minor reduction in the specific surface area. It was observed that Dy 3+ ions prefer to occupy the octahedral B site due to their large ionic radius (0.91 Å). The explanation of the electrical and magnetic properties was given in terms of the features of Dy 3+ –O 2– –Fe 3+ dysprosium–oxygen–iron indirect exchange. The occurrence of the intensive changes in amplitude–frequency characteristics was observed from 1.6 to 2.7 GHz. The explanation of electromagnetic absorption was given in terms of the peculiarities of the microstructure (resonance of domain boundaries). The results open perspectives in the utilization of [Ni 0.4 Cu 0.2 Zn 0.4 ](Fe 2– x Dy x )O 4 spinel ferrite nanoparticles as functional materials for targeted drug delivery and hyperthermia applications.

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The influence of Nd substitution in Ni–Zn ferrites for the improved microwave absorption properties

Cited by 125 publications

References 34 publications

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Methods of Assessing the Effectiveness of Filter Elements in Power Electronics

Influence of Dy³⁺Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni_0.4Cu_0.2Zn_0.4](Fe_2–xDy_x)O₄(0.00 ≤x≤ 0.04) Spinel Ferrites

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The influence of Nd substitution in Ni–Zn ferrites for the improved microwave absorption properties

Cited by 125 publications

References 34 publications

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Methods of Assessing the Effectiveness of Filter Elements in Power Electronics

Influence of Dy3+Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni0.4Cu0.2Zn0.4](Fe2–xDyx)O4(0.00 ≤x≤ 0.04) Spinel Ferrites

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Influence of Dy³⁺Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni_0.4Cu_0.2Zn_0.4](Fe_2–xDy_x)O₄(0.00 ≤x≤ 0.04) Spinel Ferrites