A superior microwave absorption material: Ni2+-Zr4+ Co-Doped barium ferrite ceramics with large reflection loss and broad bandwidth

Shi, Kouzhong; Li, Jun; He, Sun; Bai, Han; Hong, Yang; Wu, You; Jia, Dechang; Zhou, Zhongxiang

doi:10.1016/j.cap.2019.03.018

Cited by 29 publications

(3 citation statements)

References 38 publications

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“…% of filler exhibited a maximum RL of −40 dB at 7.1 GHz and < −10 dB for 1 GHz bandwidth with a thickness of 2.4 mm. Here, note that the absorption bandwidth is more important than the intensity of the absorption peak in many practical applications; to realise a wide absorption bandwidth, the filler morphology and performance control are being actively studied [45, 48-50]. In this work, the NMRASs 3, 4, 6, 7, 8, 9, and 10 showed RL values of less than −10 dB for a bandwidth of 4 GHz.…”

Section: Resultsmentioning

confidence: 94%

X-band radar-absorbing structures based on MWCNTs/NiZn ferrite nanocomposites

Nagasree¹,

Ramji

Naidu

et al. 2020

Plastics, Rubber and Composites

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Microwave absorbers present a wide range of applications in radar and telecommunications. To improve the microwave absorption characteristics of radar-absorbing structures (RASs), magnetic and dielectric materials are blended in different proportions because the impedance mismatch of dielectric materials, resulting from poor permeability, can be eliminated by a combination with magnetic loss fillers. Herein, E-glass/epoxy composites were prepared by blending multi-walled carbon nanotubes (MWCNTs) with Ni 0.5 Zn 0.5 Fe 2 O 4 (NZF) nanopowder to enhance the composites' microwave absorption. Nanocomposite laminates with different filler contents were fabricated by a simple and low-cost process of in situ polymerisation. The dielectric characteristics were estimated in the X-band, and possible loss mechanisms were studied. A two-layered RAS exhibited a reflection loss of −16 dB for a bandwidth of 2.2 GHz with a matching thickness of 3 mm. The resulting mechanical and thermal properties suggest that the proposed MWCNTs/NZF composite exhibiting good microwave absorption properties can be used in high-performance RASs.

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Section: Resultsmentioning

confidence: 94%

X-band radar-absorbing structures based on MWCNTs/NiZn ferrite nanocomposites

Nagasree¹,

Ramji

Naidu

et al. 2020

Plastics, Rubber and Composites

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“…What is more, based on the transmission line theory and metal backplane model (Fig. 1), the attenuation factor α, which reflects the EMW attenuation capability of EWAMs, can be calculated by the following equation [36,50]:…”

Section: Emw Absorption Theorymentioning

confidence: 99%

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

et al. 2022

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With the increasingly serious electromagnetic wave (EMW) pollution, the development of high-performance EMW absorbing materials (EWAMs) has become a hot topic. Carbon-based EWAMs have excellent chemical stability, high electrical conductivity, and strong dielectric loss. In particular, three-dimensional (3D) porous carbon-based EWAMs have been widely developed in the EMW absorption field. The 3D porous structure not only reduces the materials' mass density, but also improves the multiple reflections of incident EMWs and impedance matching. The carbon-based EWAMs are thus expected to achieve the goals of low density, low thickness, wide absorption bandwidth, and strong absorption. Herein, we first restated the relevant theoretical basis and evaluation methods. Then, we summarized the recent research progress of 3D porous carbon-based EWAMs with the source of the materials as the main clue. Some unique and novel viewpoints were highlighted. Finally, the challenges and prospects of 3D porous carbon-based EWAMs were put forward, which is helpful for guiding a further development of high-performance EWAMs.

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“…In order to minimize the electromagnetic pollution problems, the microwave absorbing materials have been used widely. A high efficiency microwave absorbing material should possess broad absorption bandwidth, minimum reflection loss (RL), thin matching thickness, good thermal stability, anticorrosion and light weight [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Microwave Absorption Properties of Barium Hexaferrites synthesized by sol-gel method with addition of PMMA in various ratios

Gökçe

2024

Preprint

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The M-type barium hexaferrite (\(\text{B}\text{a}{\text{F}\text{e}}_{12}{\text{O}}_{19}\)) nanoparticles were synthesized by polymethylmethacrylate (PMMA) assisted sol-gel process. PMMA was used as a template at \(\text{P}\text{M}\text{M}\text{A}/\text{B}\text{a}{\text{F}\text{e}}_{12}{\text{O}}_{19}\) weight ratio of 20/80, 40/60, 60/40% in the synthesis. The X-Ray Diffraction (XRD) and scanning electron microscopy (SEM) have been used to determine the structural, compositional and morphological features of particles. DC magnetic properties have been measured by using electron spin resonance (ESR) spectrometer and vibrating sample magnetometry (VSM) at room temperature. The dielectric, magnetic and microwave properties were studied by reflection/transmission technique in the coaxial waveguide at the frequency range of 2–18 GHz. The results show that the nanorod nanoparticles are ~ 200 nm in length and ~ 40–50 nm in width for the sample with \(\text{P}\text{M}\text{M}\text{A}/\text{B}\text{a}{\text{F}\text{e}}_{12}{\text{O}}_{19}\) weight ratio of 20/80. The minimum reflection loss value of rod-shaped nanoparticles achieves ~ -50 dB with bandwidth of 2.25 GHz at -20 dB.

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A superior microwave absorption material: Ni2+-Zr4+ Co-Doped barium ferrite ceramics with large reflection loss and broad bandwidth

Cited by 29 publications

References 38 publications

X-band radar-absorbing structures based on MWCNTs/NiZn ferrite nanocomposites

X-band radar-absorbing structures based on MWCNTs/NiZn ferrite nanocomposites

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

Magnetic and Microwave Absorption Properties of Barium Hexaferrites synthesized by sol-gel method with addition of PMMA in various ratios

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