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• W4320717275 endingPage "141857" @default.
• W4320717275 startingPage "141857" @default.
• W4320717275 abstract "Mayenite electride (C12A7:e-), the first stable inorganic electride with cage-trapped electron anions, possesses excellent electrical conductivity suitable for effective microwave absorption (MA). However, its inherent impedance mismatch with free space limits its applications. It can be overcome by favorable structural engineering and incorporation of magnetic materials. However, achieving high-frequency MA is still a challenge that needs some ingenious strategies to address. The crucial requirements for high-frequency MA are the suitable electromagnetic (EM) parameters and their high-frequency stability. Here, C12A7:e- provides enhanced permittivity at high frequency due to the EM response from the smallest anions, and the core–shell structure with graphitic carbon shells (C12A7:e-@G) improves interfacial polarization losses. Furthermore, the material exhibits excellent anticorrosive property due to the peculiar core–shell structure. Magnetic losses are introduced through Fe3O4 nanoparticles (NPs) having different sizes and morphologies to achieve anisotropy-dependent breaching of Snoek’s limit that stabilizes the high-frequency permeability. Sphere-like (S1:48 ± 3 nm and S2:14 ± 2 nm), flake-like (F:30 ± 3 nm), and polyhedra-like (P:34 ± 3 nm) Fe3O4 NPs are used to reinforce C12A7:e-@G. Benefiting from the superparamagnetism-induced anisotropic enhancement of permeability, S2 incorporated system (CSN2) having thickness 2.6 mm results in an unprecedented reflection loss of −91.9 dB at 30.7 GHz with an ultra-wide effective absorption bandwidth of 9.1 GHz. The detailed analysis of EM parameters reveals dielectric and magnetic losses along with synergistically improved impedance matching in the composites. The real environment application, demonstrated through radar cross section indicates a reduction of 23.3 dBm2 from CSN2 coated surface, which provides an insight into the design and development of electride-based high-frequency microwave absorbers." @default.
• W4320717275 created "2023-02-15" @default.
• W4320717275 creator A5039199460 @default.
• W4320717275 creator A5060280162 @default.
• W4320717275 date "2023-04-01" @default.
• W4320717275 modified "2023-10-14" @default.
• W4320717275 title "The smallest anions entrapped mayenite electride@graphitic carbon core-shells reinforced with superparamagnetic Fe3O4 delivers unrivalled high-frequency microwave absorption" @default.
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• W4320717275 doi "https://doi.org/10.1016/j.cej.2023.141857" @default.
• W4320717275 hasPublicationYear "2023" @default.
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