Novel approach to prepare carbon-encapsulated CIPs@FeO composite for efficient absorption of low-frequency microwave

Peng, Yin; Zhang, Limin; Sun, Ping; Wu, Wenjing; Sun, Xiaowei; Feng, Xiqi; Wang, Jian; Dai, Jianwu; Tang, Yuting

doi:10.1007/s10854-020-03655-6

Cited by 19 publications

(5 citation statements)

References 50 publications

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“…The thermogravimetric curve (Figure f) shows that FeCoNiCr 0.4 Cu 0.2 HEAs only gain 5 wt % when temperature is up to 400 °C. Compared to other EM absorbers, FeCoNiCr 0.4 Cu 0.2 HEAs/resin composites have excellent and temperature-stable EM absorption performance in the MHz frequency range from −50 to 150 °C, as shown in Figure g. ,− Moreover, FeCoNiCr 0.4 Cu 0.2 HEAs not only have lower effective EM absorption frequency (Table S2) and temperature-stable EM absorption performance but also have excellent oxidation resistance, high Curie temperature, and good flexibility, as shown in Figure h. ,,,, Therefore, this novel absorber has distinguished comprehensive performance to adapt to various harsh service environments.…”

Section: Resultsmentioning

confidence: 92%

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FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Liu

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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Electromagnetic (EM) absorbers serving in the megahertz (MHz) band and a wide temperature range (from −50 to 150 °C) require high and temperature-stable permeability for outstanding EM absorption performance. Herein, FeCoNiCr0.4Cu X high-entropy alloy (HEA) powders with a unique nanocrystalline structure separated by a thin amorphous layer (NTA) are designed to improve permeability and enhance intergranular coupling. Simultaneously, the long-range anisotropy is introduced via devising the preparation process and tuning the chemical composition, such that the intergranular exchange interaction is further strengthened for stable permeability and EM wave absorption in a wide temperature range. FeCoNiCr0.4Cu0.2 HEAs exhibit a near-zero permeability temperature coefficient (5.7 × 10–7 °C–1) a in wide temperature range. The maximum reflection loss (RL) of FeCoNiCr0.4Cu0.2 HEAs is higher than −7 dB with 5 mm thickness at −50–150 °C, and the absorption bandwidth (RL < −7 dB) can almost cover 400–1000 MHz. Furthermore, FeCoNiCr0.4Cu0.2 HEAs also have a high Curie temperature (770 °C) and distinguished oxidation resistance. The permeability temperature dependence of FeCoNiCr0.4Cu X HEAs is investigated in-depth in light of the microstructural change induced by tuning the chemical composition, and a new inspiration is provided for the design of magnetic applications serving in wide temperature, such as transformers, sensors, and EM absorbers.

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Section: Resultsmentioning

confidence: 92%

“…(f) Thermogravimetric and thermomagnetic curves of FeCoNiCr 0.4 Cu 0.2 HEAs. (g) Comparative chart of EM absorption performance in the MHz frequency range for EM absorbers. ,− (h) Comparative chart of the comprehensive performance for representative low-frequency absorbers. ,,,, …”

Section: Resultsmentioning

confidence: 99%

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Liu

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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“…Compared with other recent‐reported lower‐frequency MA materials, it was clear that the MoC/Mo 2 C/C in this work shows overwhelming superiority in terms of comprehensive MA performance (Figure 4b). [ 56–66 ]…”

Section: Resultsmentioning

confidence: 99%

“…The specific MA performance of all samples was further listed in 4b). [56][57][58][59][60][61][62][63][64][65][66]…”

Section: Electromagnetic Performancementioning

confidence: 99%

Atomic and Electronic Reconstruction in Defective 0D Molybdenum Carbide Heterostructure for Regulating Lower‐Frequency Microwaves

Yuan

Cheng

et al. 2023

Adv Funct Materials

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Abstract0D nanomaterials with high efficiency of atom utilization possess extraordinary tunability over bulk materials. Precise reconstruction of atoms in a 0D nanoparticle toward tuning of crystalline phases and defects is highly desirable but remains a grand challenge. In this study, a crystallization rate‐controlled strategy is reported to achieve controllable reconstruction of atoms in situ, which inducts a series of monodisperse 0D molybdenum carbide nanoparticles (MoxC NP) that anchor on a carbon matrix with adjustable crystalline phases and atom vacancies. Aberration‐corrected transmission electron microscopy, electron paramagnetic resonance technique, density functional theory calculation, and electron holography jointly reveal the atomic reconstruction process and confirm its remarkable effects of optimizing the local electronic states and enhancing the heterointerface interactions. As a result, the optimized MoC/Mo2C heterostructure on the carbon matrix is shown to enable the promoted dielectric response and generate more than 90% absorption of lower‐frequency microwaves (the current 5th‐generation communication band). The control of atomic reconstruction may provide an effective pathway for unlocking tunable dielectric properties of 0D nanomaterials toward various technological applications.

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“…9f, the eddy current loss contributes to magnetic loss. 140 C 0 = μ ′′ μ ′ −2 f −1 = 2π μ 0 d 2 σ where σ is the electric conductivity of the material, d is the thickness of the material and μ 0 is the permeability of a vacuum.…”

Section: Microwave Absorption Performances Of Carbon Aerogelsmentioning

confidence: 99%

Construction and application of carbon aerogels in microwave absorption

Guo

Bian

et al. 2023

Phys. Chem. Chem. Phys.

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Novel approach to prepare carbon-encapsulated CIPs@FeO composite for efficient absorption of low-frequency microwave

Cited by 19 publications

References 50 publications

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Atomic and Electronic Reconstruction in Defective 0D Molybdenum Carbide Heterostructure for Regulating Lower‐Frequency Microwaves

Construction and application of carbon aerogels in microwave absorption

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Novel approach to prepare carbon-encapsulated CIPs@FeO composite for efficient absorption of low-frequency microwave

Cited by 19 publications

References 50 publications

FeCoNiCr0.4CuX High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

FeCoNiCr0.4CuX High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Atomic and Electronic Reconstruction in Defective 0D Molybdenum Carbide Heterostructure for Regulating Lower‐Frequency Microwaves

Construction and application of carbon aerogels in microwave absorption

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Product

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FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum