Synthesis of hollow rod-like hierarchical structures assembled by CoFe/C nanosheets for enhanced microwave absorption

Abstract

Composites of ferromagnetic metal and carbon with hierarchical structures are favoured for strengthening microwave absorption capability due to synergistic effects of hybrid structures and enhanced interfacial polarization. However, it remains...

Deformation-Thermal Co-Induced Ferromagnetism of Austenite Nanocrystalline FeCoCr Powders for Strong Microwave Absorption

“…For the raw FeCoCr powders, periodical stripes with a spacing of 0.179 nm can be seen in high-resolution TEM image, corresponding to the (200) crystal plane of γ-austenite. The SAED pattern confirms a typical FCC structure with a crystal band axis of [11]. The presence of ε-martensite was not identified in the raw FeCoCr powders due to its low content and sampling of the TEM image.…”

“…These requirements are beyond the reach of traditional microwave absorbents with single composition, e.g., carbonyl iron [8,9]. Soft magnetic alloys are promising to meet these new requirements [10][11][12][13] since they can benefit from composition design. Many soft magnetic alloy absorbents were reported in the literature, ranging from binary alloys such as FeNi [14], FeCr [15], FeCo [16] and FeSi [17], to ternary/quaternary/pentanary/hexanary alloys such as FeSiAl [18], FeSiAlCr [19], NiCrAlY [20] and FeSiBPCuY [21].…”

CoZnO/C@BCN nanocomposites derived from bimetallic hybrid ZIFs for enhanced electromagnetic wave absorption

“…The magnetic Co-NPs and Zn-NPs in CoZnO/C@BCN were dispersed on the surface of BCN, resulting in a lower M s value. 30 Additionally, Zn-NPs were easily oxidized, leading to decreased M s . The coercive fields ( H c ) of Co 1 Zn 1 O/C@BCN, Co 1 Zn 2 O/C@BCN, and Co 2 Zn 1 O/C@BCN were 320.0, 310.0, and 280.0 Oe, respectively, as shown in Fig.…”

Rational design of two-dimensional flaky Fe/void/C composites for enhanced microwave absorption properties

“…8a shows the air-to-material interface intrinsic reflection coefficient ( Γ ), 57 which is the function of complex permittivity and complex permeability. 58,59 …”