Enhanced electromagnetic wave absorption performance of novel carbon-coated Fe₃Si nanoparticles in an amorphous SiCO ceramic matrix

Abstract

Tunable electromagnetic properties and excellent thermo-stability are important criteria while choosing absorbers.

Superparamagnetic ZnFe2O4 Nanoparticles-Reduced Graphene Oxide-Polyurethane Resin Based Nanocomposites for Electromagnetic Interference Shielding Application

“…From the above relation, it is easy to recognize that the curves of ε′ and ε″ would be a semi-circle, which is known as the Cole–Cole semicircle [ 75 ].…”

“…From the above relation, it is easy to recognize that the curves of ε′ and ε″ would be a semi-circle, which is known as the Cole-Cole semicircle [75]. In general, the relaxation is associated with a delay in polarization concerning the change in the electrical field.…”

Flexible Fe3Si/SiC ultrathin hybrid fiber mats with designable microwave absorption performance

“…Such enhanced exibility is owing to the smaller ber diameter and higher crystallization degree than pure SiC bers. 31,49 However, as the Fe 3 Si content further increased to 6.3 wt%, the DR/R 0 value obviously jumps above 1% aer 100 times bending. The decline of exibility attributes to the over loading to Fe 3 Si nanoparticles, which may act as the crack initiation points and introduce more defects to the hybrid bers.…”

“…Compared with the aforementioned magnetic phases, Fe–Si alloy, as one kind of magnetic alloys, shows high Curie point and oxidation resistance. 31 Therefore, the composition of Fe–Si alloy into SiC fibers could be an effective approach to improve the EM absorption properties without sacrificing the high temperature stability. In this work, flexible Fe 3 Si/SiC ultrathin fiber mats with different Fe 3 Si contents were successfully prepared by electrospinning, which has been widely adopted to fabricate 1D nano-materials (nanofibers, nano-nets and nano-rods) with controllable microstructure, morphology, and distribution.…”

Enhanced Electromagnetic Wave Absorption for Y2O3-Doped SiBCN Ceramics

“…Therefore, the PDCs have excellent EMW absorption properties owing to the polarization loss and conductivity loss. To further improve the EMW absorption performance of the PDCs, there are mainly two ways: one is to add a transition-metal catalyst to generate crystalline phases, , and the other is to add conductive and/or dielectric phases as the second phase (CNTs, RGO, CNWs, and ZrB 2 ). − For example, Jia et al added nano-ZrB 2 into SiC to enhance the interface polarization and induced current, and the minimum reflection loss (RL min ) reached −29.3 dB. Ren et al added CNWs/SiC to the SiCN ceramics, which greatly increased the polarization loss phase and the conductive network in the material, the RL min was −21.6 dB, and the effective absorption bandwidth (EAB) was 4.2 GHz.…”