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Broadband microwave absorption of CoNi@C nanocapsules enhanced by dual dielectric relaxation and multiple magnetic resonances
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Image of FIG. 1.
FIG. 1.

(a) TEM and (b) high-resolution-TEM image of CoNi@C nanocapsules; (c) sketch of incident EMW and absorber layer (nanocapsules uniformly mixed with wax) with thickness of d mm.

Image of FIG. 2.
FIG. 2.

(a) Frequency dependence of the relative complex permittivity; (b) Cole-Cole plot. The two dashed circles are guides to the eyes, a = (  +  )/2, r = ( - )/2, denotes the static limit of the permittivity and is thehigh-frequency limit of the permittivity; (c) frequency dependence of the relative complex permeability, and (d) frequency dependence of ″(′) .

Image of FIG. 3.
FIG. 3.

(a) and (b) Frequency dependence of measured and fitted curves of the real part of the permeability ′ and imaginary part ″ of the permeability (the measured data and fitted curves are represented by open circles and the solid lines, respectively), and (c) frequency dependence of the dielectric-loss factor and the magnetic-loss factor.

Image of FIG. 4.
FIG. 4.

(a) Frequency dependence of the microwave RL and (b) contour map of the bandwidth with RL < −10 dB (90% absorption) as a function of the absorber thickness.


Generic image for table
Table I.

Fitting parameters for the permeability dispersion spectra. and are the fitted and calculated resonance frequency, respectively. is the intensity of the resonance peak and the damping coefficient. is the eigenvalue of the derivative of the spherical Bessel function ().

Generic image for table
Table II.

EMW-absorption properties of some earlier reported nanocomposites. The absorber thickness denotes the layer-thickness (range) for which RL < −25 dB. The weight ratio represents the material-wax ration in the absorber. The maximum RL value corresponds to the largest absolute value of RL. The absorption band width represents the frequency range for which RL < −25 dB.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Broadband microwave absorption of CoNi@C nanocapsules enhanced by dual dielectric relaxation and multiple magnetic resonances