Fig 1

(a) Schematic illustration for fabrication of amorphous FeSiBCr flakes with dual nanophases. (b) XRD patterns and (d) magnetic hysteresis loops, (e) the magnified loops under low field and (f) the corresponding magnifications under high field of raw powder and milled powders. (c) Calculated α-Fe and FeNi grain size with different milling time. (g) Summarized MS and HC values of raw powder and milled powders."

Fig 2

The morphology of powders with milling time of (a) 3 h, (b) 4 h, (c) 5 h and (d) 6 h. (e) the average thickness and size based on statistical data of over 100 particles. (f) the calculated aspect ratio."

Fig 3

(a) TEM image of powder with 5 h milling. (b) Enlarged view of the red dashed box in (a). (c) the corresponding HAADF image of (b) with the elemental distribution maps. HRTEM images of (d) the surface, (e) FeNi phase and (f) α-Fe nanocrystalline. The insets correspond to the magnified views of the red dashed circles in (e) and (f), respectively."

Fig 4

(a) Full spectrum, (b) detailed O 1s spectra, (c) detailed Fe 2p spectra, (d) high-resolution Si 2p spectra, (e) the fitted Cr 2p and (f) high-resolution Ni 2p of powder with ball milling time of 5 h. (g) structural diagram of amorphous FeSiBCr flakes with dual nanophases."

Fig 5

(a) ɛ′, (b) ɛ′′, (c) tanδE and (d) ɛ′ versus ɛ′′ curves of powders with different milling time. (e) dielectric loss mechanism."

Fig 6

(a) μ′, (b) μ′′, (c) tanδM, (d) C0 and (e) μ′ versus μ′′ curves of powders with different milling time."

Fig 7

(a–d) 3D images of RL vs. f vs, t for powders with different milling time. (e) A comparison of six parameters is conducted for powders with different milling time. (f) Microwave absorption performances of 5 h milled powder are compared with the reported flaky materials [48–57]."

Fig 8

RL, λ/4, Zim and the corresponding loss separation results of RLm curves of powders with milling time of (a) 3 h, (b) 4 h, (c) 5 h and (d) 6 h."

Fig 9

Schematic illustration of possible EM loss mechanism of amorphous FeSiBCr flakes with dual crystalline nanophases."

Fig 10

(a) a gradient structure for extending EAB. (b) Working principle of radar detector and absorption coating and RCS simulation model with setting dimensions. 3D radar wave scattering plots for (c) PEC and PEC/powder with milling time of (d) 3 h, (e) 4 h, (f) 5 h, (g) 6 h. (h) RCS simulation curves of PEC and PEC with milled powder coating at different angles."