Tunable magnetic coupling and dipole polarization of core-shell Magnéli Ti4O7 ceramic/magnetic metal possessing broadband microwave absorption properties

Li, Yang; Qing, Yuchang; Zhao, Biao; Bai, Pengwei; Zhang, Rui; Yao, Haoyang; Luo, Fa

doi:10.1016/j.ceramint.2021.08.240

Cited by 19 publications

(6 citation statements)

References 41 publications

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“…[ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] In comparison to magnetic loss materials, more attention is paid to dielectric loss materials investigation. Though some interesting works reported the magnetic coupling mechanism or the influence of orientation arrangement of materials under external magnetic field on EM wave loss behavior, [ 25 , 26 , 27 ] magnetic loss materials such as magnetic metals and carbonyl iron suffer from the ferromagnetic to paramagnetic transition with temperature higher than Curie point, [ 28 , 29 , 30 , 31 , 32 ] thus leading to EM loss capacity degraded. Besides, high‐density issue also restricts the development of novel magnetic loss materials.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional in military stealth and incoming 5G smart era. Dielectric loss EM wave absorbers and underlying loss mechanism investigation are of great significance to unveil EM wave attenuation behaviors of materials and guide novel dielectric loss materials design. However, current researches focus more on materials synthesis rather than in-depth mechanism study. Herein, comprehensive views toward dielectric loss mechanisms including interfacial polarization, dipolar polarization, conductive loss, and defect-induced polarization are provided. Particularly, some misunderstandings and ambiguous concepts for each mechanism are highlighted. Besides, in-depth dielectric loss study and novel dielectric loss mechanisms are emphasized. Moreover, new dielectric loss mechanism regulation strategies instead of regular components compositing are summarized to provide inspiring thoughts toward simple and effective EM wave attenuation behavior modulation.

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Section: Introductionmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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“…2b, demonstrate the regular spacing distance of 0.33 nm for the observed planes, which can be assigned as the (1 20) crystal plane of the main component Ti 4 O 7 based on their dspacings. 38,39 The top and cross-section morphology of the Celgard 2400 separator and TiO 2−x -2-coated separator are demonstrated in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Oxygen-deficient TiO_2−x interlayer enabling Li-rich Mn-based layered oxide cathodes with enhanced reversible capacity and cyclability

et al. 2023

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“…As shown in Figure 5 (g, h), compared with other nanomaterial absorbers of similar structure, the double‐shell hollow sphere absorber prepared in this work simultaneously meets the indicators of thin thickness, high RL, and wide effective absorption bandwidth, and has excellent comprehensive absorbing performance. [ 74–87 ]…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 5 (g, h), compared with other nanomaterial absorbers of similar structure, the double-shell hollow sphere absorber prepared in this work simultaneously meets the indicators of thin thickness, high RL, and wide effective absorption bandwidth, and has excellent comprehensive absorbing performance. [74][75][76][77][78][79][80][81][82][83][84][85][86][87] To further reveal the microwave absorption mechanism of MoC 1-x /C-TCN, the quarter-wavelength matching theory was introduced to further study the correlation between RL and the matching thickness of the absorber. Its calculation formula is as follows: [88][89][90]…”

Section: Resultsmentioning

confidence: 99%

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Zhao

Jia

Zhang

et al. 2022

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EMW radiation will interfere with the normal operation of digital equipment and electronic components, and it is difficult to guarantee people's information security. [4,5] More seriously, studies have shown that EMW can interfere with the inherent magnetic field of the human body, increasing the risk of skin diseases, heart disease, cancer, and other diseases, and pose a great threat to health. [6][7][8][9] Therefore, it is urgent to develop advanced and efficient absorbing materials. [10] The absorption behavior of high-performance EMW absorbing materials depends heavily on the electromagnetic parameters and impedance-matching properties. [11,12] In turn, they are closely related to the size, microstructure, composition, and geometry of the material. [13][14][15] However, in addition to the inherent magnetic and dielectric properties, the material itself will affect the impedance-matching characteristics of the material. In order to improve the electromagnetic absorption property, the reasonable design and construction of absorbing materials with special microstructure are also very important for the attenuation of EMW. It is generally believed that the properties of materials are highly related to the nanostructures of materials. [16] Therefore, researchers have made great efforts to design and regulate materials with special structures. such as arranged structures, porous structures, hollow structures, and core-shell structures, in which especially hollow and porous structures with low density and large hollow interfaces have aroused the interest of researchers. [17][18][19] In absorbing materials, the design of voids or shells can efficiently decrease the density of materials for lightweight purposes, and the impedancematching characteristics can be adjusted by reducing the complex permittivity. The existence of this internal void also gives it multiple reflections and scattering effects, which is conducive to prolonging the propagation path of EMWs to enhance attenuation. [20][21][22] As a typical class of dielectric loss materials, carbides have been highly sought after by researchers because of their various remarkable advantages such as good thermal stability, high mechanical strength, and high resistance to oxidation and corrosion. [23][24][25][26][27][28][29] Especially in the field of EMW absorption, researchers have used the semiconducting nature of carbide to regulate the dielectric constant of carbon materials by compounding with carbon materials to effectively regulate the In order to achieve excellent electromagnetic wave (EMW) absorption properties, the microstructure design and component control of the absorber are critical. In this study, three different structures made of Mo 2 C/C hollow spheres are prepared and their microwave absorption behavior is investigated. The Mo 2 C/C double-shell hollow spheres consisting of an outer thin shell and an inner rough thick shell with multiple EMW loss mechanisms exhibit good microwave absorption properties. In order to further improve the microwave abso...

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Tunable magnetic coupling and dipole polarization of core-shell Magnéli Ti4O7 ceramic/magnetic metal possessing broadband microwave absorption properties

Cited by 19 publications

References 41 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Oxygen-deficient TiO_2−x interlayer enabling Li-rich Mn-based layered oxide cathodes with enhanced reversible capacity and cyclability

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

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Tunable magnetic coupling and dipole polarization of core-shell Magnéli Ti4O7 ceramic/magnetic metal possessing broadband microwave absorption properties

Cited by 19 publications

References 41 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Oxygen-deficient TiO2−x interlayer enabling Li-rich Mn-based layered oxide cathodes with enhanced reversible capacity and cyclability

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

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Oxygen-deficient TiO_2−x interlayer enabling Li-rich Mn-based layered oxide cathodes with enhanced reversible capacity and cyclability