Dielectric enhancement effect in biomorphic porous carbon-based iron@iron carbide ‘meta-powder’ for light-weight microwave absorption material design

In this paper, biomorphic porous carbon-based composite powder, in which Fe@Fe 3 C core–shell nanoparticles embedded periodically, was fabricated by morphology genetic method. The morphology, microstructure, dielectric properties, and the microwave absorption performance of the composite powder were characterized in detail. The results indicate that the coupling effect among the neighboring core–shell nanoparticles will be strengthen in the case of ordered distribution, leading to leading to an unconventional permittivity enhancement phenomenon. This coupling effect will enlarge the energy consumption capacity of the composite powder, which offer a promising prospect for the light-weight microwave absorption materials (MAM) design. According to the experimental results, the effective absorption bandwidth (RL