HR-TEM images and EDS analysis of the core/shell nanocapsules: (a), (b) and (b`) for Fe/Al2O3; (c) and (c`) for Fe/TiFe2O4; (d) and (d`) for Fe/MnFe2O4.
FTIR spectra of the core/shell nanocapsules. (a) Fe/TiFe2O4, (b) Fe/MnFe2O4, and (c) Fe/Al2O3. In each figure, the FTIR spectra of the micro-sized oxides and Fe nanoparticles are shown for comparison.
(a) Oxygen potential diagrams of Fe and heterogeneous oxides (TiO2, MnO, and Al2O3); 18 (b) XRD patterns of the core/shell nanocapsules. (i) Fe/TiFe2O4, (ii) Fe/MnFe2O4, and (iii) Fe/Al2O3.
Frequency dependence of (a) complex permeability ( ) and (b) complex permittivity ( ) of Fe/TiFe2O4, Fe/MnFe2O4, and Fe/Al2O3 nanocapsules.
(a) Calculated GGA electronic DOS and down-spin band structures of (b) TiFe2O4, and (c) MnFe2O4.
Frequency dependence of the RL of (a) Fe/TiFe2O4, (b) Fe/MnFe2O4, and (c) Fe/Al2O3 nanocapsules in a frequency range of 2–18 GHz. The curves in (a) and (b) represent the optimal RL in Fe/TiFe2O4 and Fe/MnFe2O4 at absorber thicknesses of 2.3 mm and 1.6 mm, respectively.
Microwave absorption performance of the metal/oxide nanocapsules/paraffin composites and other reported composites.
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