Fig. 6

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CMCs containing carbonaceous fillers for epsilon-negative metacomposites. Schematic preparation process (a) (Copyright © 2016, The Royal Society of Chemistry) and permittivity spectra (b) (Copyright © 2016, Elsevier) of C/Si3N4 composites with different carbon content [57,64]; Schematic diagram of microstructure and permittivity spectra of C/Si3N4 composites carbonized at different temperature (c) [58] Copyright © 2017, Elsevier.

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