Magnetic Properties and Morphology Copper-Substituted Barium Hexaferrites from Sol-Gel Auto-Combustion Synthesis

Lohmaah, Abdulmumeen; Chokprasombat, Komkrich; Pinitsoontorn, Supree; Sirisathitkul, Chitnarong

doi:10.3390/ma14195873

Cited by 13 publications

(8 citation statements)

References 30 publications

(72 reference statements)

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“…[60,[118][119][120][121]. They are also developing new synthesis methods, such as sol-gel processing and electrospinning, [122][123][124] to create materials with specific structures and properties.…”

Section: Design and Synthesis Of New Materialsmentioning

confidence: 99%

Theory, Modeling, Measurement, and Testing of Electromagnetic Absorbers: A Review

Abu Sanad,

Mahmud,

Ain

et al. 2023

Physica Status Solidi (a)

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In the era of the fifth generation (5G) and the Internet of Things (IoT), electromagnetic interference (EMI) poses a significant challenge. The rapid growth of wireless communication applications leads to increased electromagnetic (EM) pollution, which can have adverse health effects. To address this issue, electromagnetic absorbers (EMAs) play a critical role in eliminating EMI and reducing EM pollution between electronic devices. The focus is now on developing diverse microwave absorbing materials (MAMs) with different structures to cover a wide range of frequencies while remaining cost‐effective and effective at high angles of incidence radiation. This article comprehensively reviews EMAs, highlighting their design parameters and importance in achieving high‐efficiency absorption. The review covers absorber theory, structure, materials for various frequency ranges, and the mechanisms responsible for dissipating electromagnetic waves (EMWs). Analytical and numerical methods for modeling and analyzing EMAs are discussed, along with performance indicators and testing methods. The role of absorbers in different applications is explored, and emerging research directions for enhancing microwave absorbers are also highlighted.

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Section: Design and Synthesis Of New Materialsmentioning

confidence: 99%

Theory, Modeling, Measurement, and Testing of Electromagnetic Absorbers: A Review

Abu Sanad,

Mahmud,

Ain

et al. 2023

Physica Status Solidi (a)

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“…This may avoid precipitation of crystalline metal oxides and metal hydroxides. [40] Further, thermal decomposition of metal-polymeric complex results in the formation of silver nanoparticles, in which organic part in the complex act as the reducing agent.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, under hot conditions polymerization reaction between citric acid and polyols from fruit extract can take place, while metal ions are stuck in this structure. This may avoid precipitation of crystalline metal oxides and metal hydroxides [40] . Further, thermal decomposition of metal‐ polymeric complex results in the formation of silver nanoparticles, in which organic part in the complex act as the reducing agent.…”

Section: Introductionmentioning

confidence: 99%

Bulk Level Synthesis of Solid Silver Nanocatalyst: Green Mediated Approach

et al. 2022

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The synthesis of silver nano particles has acquired more attention in terms of its applicability in various fields including medicine, environmental, electronics and energy. Owing to its exceptionally good catalytic activity, this particular study is focused on the synthesis of silver nanoparticles in bulk scale, free from capping agents. Apart from the conventional colloidal green synthesis, the silver nanoparticles were synthesized in solid form using a cheap green medium lime fruit extract. The green mediated sol-gel auto combustion method eliminates the use of hazardous reducing agents and tedious purification processes. The structure, morphology and purity of the synthesized material were explored through various analytical techniques. TEM studies revealed that the synthesized silver nanoparticles were spherical in shape with average particle size of 8 nm. The potential of the silver nanoparticle as a catalyst towards reduction of organic compounds and dye degradation was established by conducting nitrophenol reduction and methylene blue degradation as a basic reaction. The nanoparticles were found to have effectively catalysed the reduction of p-nitrophenol and degradation of methylene blue with the aid of sodium borohydride as reducing agent. It may open up new path for the chemical free synthesis of crystalline silver nanoparticles with enhanced catalytic property.

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“…On the other hand, hexaferrites have a sufficiently high crystallographic texture that permits the exploitation of their magnetocrystalline anisotropy fields, H a , affording them the potential for miniaturization and improved integration of microwave and millimeter-wave (MMW) devices. Specifically, Mtype Ba-hexaferrites (i.e., BaFe 12 O 19 , BaM) have attracted much attention for applications in monolithic-microwave-integrated circuits (MMIC) due to their strong and adjustable H a , that acts as an effective internal field [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…4 Oe/GHz. ∆H a and ∆H p relate to the crystalline anisotropy and porosity-induced linewidth-broadening contributions.…”

mentioning

confidence: 99%

Crystallographically Textured and Magnetic LaCu-Substituted Ba-Hexaferrite with Excellent Gyromagnetic Properties

Jiao

Wang

Wei³

et al. 2022

Materials

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Excellent gyromagnetic properties of textured, bulk Ba-hexaferrite samples are required for low-loss, self-biased applications for microwave and millimeter-wave (MMW) devices. However, conventionally processed bulk Ba-hexaferrite ceramics typically demonstrate low remanent magnetization values, 4πMr, of 2.0~3.0 kG, and relatively large ferromagnetic resonance (FMR) linewidths, ΔHFMR, of 0.8~2 kOe. These properties lead to the development of high-performance, practical devices. Herein, crystallographically textured Ba-hexaferrite samples, of the composition Ba0.8La0.2Fe11.8Cu0.2O19, having excellent functional properties, are proposed. These materials exhibit strong anisotropy fields, Ha, of ~14.6 kOe, high remanent magnetization, 4πMr, of 3.96 kGs, and a low ΔHFMR of 401 Oe at zero-bias field at the Q-band. Concomitantly, the broadband millimeter-wave transmittance was utilized to determine the complex permeability, μ*, and permittivity, ε*, of textured hexaferrites. Based on Schlöemann’s theory of complex permeability, μ*, the remanent magnetization, 4πMr, anisotropy field, Ha, and effective linewidth, ΔHeff, were estimated; these values agree well with measured values.

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Magnetic Properties and Morphology Copper-Substituted Barium Hexaferrites from Sol-Gel Auto-Combustion Synthesis

Cited by 13 publications

References 30 publications

Theory, Modeling, Measurement, and Testing of Electromagnetic Absorbers: A Review

Theory, Modeling, Measurement, and Testing of Electromagnetic Absorbers: A Review

Bulk Level Synthesis of Solid Silver Nanocatalyst: Green Mediated Approach

Crystallographically Textured and Magnetic LaCu-Substituted Ba-Hexaferrite with Excellent Gyromagnetic Properties

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