The similar Cole-Cole semicircles and microwave absorption of Hexagonal Co/C composites

Synthesis and Microwave Absorption Properties of Fe-Loaded Fly Ash-Based Ceramic Composites

“…The relationship curve between the ε″ and ε′ for FeFA500, FeFA800, and FeFA900 is shown in Figure . Among the three samples, all display four semicircles, indicating that there may be quaternary dielectric relaxation processes . This further proves the enhancement in MA performance of the FeFA composite compared with FA.…”

Morphology control of eco-friendly chitosan-derived carbon aerogels for efficient microwave absorption at thin thickness and thermal stealth

“…CA3.5-4 has more semicircles, which means that it has more relaxation processes than CA3.5-60. 55,56 This is mainly because of its larger porosity, more solid-air interfaces and more structural defects. The average values of the dielectric loss tangent (tan δ ε = ε″/ε′) of all aerogels can be seen from Fig.…”

Facile Preparation of Ti3C2Tx MXene@Zn–Mn Ferrite Composites with Enhanced Microwave Absorption Performance

“…The presence of two Cole–Cole semicircles in the high-frequency range of 8–18 GHz indicates that there are two obvious polarization behaviors in MXene; these have been explained as polarization perpendicular (circle 1) or parallel (circle 2) to the lamellar direction of MXene . In contrast, four semicircles are observed in MXene@ZMF composites and ZMF, indicating the existence of a multiple relaxation processes . The dielectric relaxation of pure ZMF may come from interface polarization caused by structural inhomogeneity, dipole polarization caused by metal ion pairs (such as Fe 2+ /Fe 3+ ), and orientation polarization caused by cation vacancies in the lattice. − In addition to the polarization relaxation seen in ZMF, MXene@ZMF composites may exhibit interface polarization between ferrite and MXene and other relaxation mechanisms involving active functional groups and defects of MXene.…”