Core–shell-like nanocrystalline FeSiB/amorphous carbon composite powder with remarkable and tunable microwave absorption properties

Multifunctional amorphous FeCoNiTixSi high-entropy alloys with excellent electromagnetic-wave absorption performances

“…If the magnetic losses were only due to eddy current loss, the value of C 0 would be a constant with changing frequency. 28,30,31 As demonstrated in Fig. 8d, the C 0 curves of all samples decreased with increasing frequency, indicating that eddy current losses and natural resonance together contribute to the magnetic losses.…”

“…Each semicircle in the Cole–Cole semicircle graphic represents a dielectric relaxation process. 27,28 For example, for #T001, two Cole–Cole circles can be observed, corresponding to the peak at approximately 9 GHz ( ε ′ ≈ 10.2, ε ′′ ≈ 0.8) and 11 GHz ( ε ′ ≈ 10, ε ′′ ≈ 0.9). Four Cole–Cole circles can be observed for #T100, corresponding to the peaks at 9 GHz ( ε ′ ≈ 12.6, ε ′′ ≈ 3.0), 11.17 GHz ( ε ′ ≈ 12.9, ε ′′ ≈ 2.7), 13 GHz ( ε ′ ≈ 12.4, ε ′′ ≈ 2.8) and 16 GHz ( ε ′ ≈ 12.8, ε ′′ ≈ 4).…”

Amorphous Carbon Regulates Defects to Achieve TaC Nanowires with Enhanced Microwave Absorption

“…Notably, the D and G bands were identified as prominent diffraction peaks at 1340 and 1590 cm –1 , respectively. The D peak mainly results from the vibrational stretching of C–C and CC bonds, while the G peak primarily stems from the vibrational stretching of sp2 hybridized carbon atoms within the material . The broader D peak confirms the presence of carbon defects, whereas the presence of a G peak indicates the existence of graphitized carbon.…”

“…The D peak mainly results from the vibrational stretching of C−C and C�C bonds, while the G peak primarily stems from the vibrational stretching of sp2 hybridized carbon atoms within the material. 27 The broader D peak confirms the presence of carbon defects, whereas the presence of a G peak indicates the existence of graphitized carbon. The D peak mainly comes from the stretching vibration of C−C bond and C�C bond, while the G peak mainly comes from the stretching vibration of sp2 hybrid carbon atoms in the material.…”

Construction of shell-like carbon superstructures through anisotropically oriented self-assembly for distinct electromagnetic wave absorption

“…Incident electromagnetic waves entering it can undergo multiple reflections and scattering, which greatly prolongs its attenuation path and is conducive to the full consumption of electromagnetic waves. 49 Secondly, the conductivity of shell-like carbon superstructures is positively related to the imaginary part of the permittivity. According to the Debye equation, the conductive loss of shell-like carbon superstructures is linearly related to its conductivity.…”