Novel magnetic silicate composite for lightweight and efficient electromagnetic wave absorption

doi:10.1016/j.jmst.2021.03.029

Abstract

Abstract:

A series of silicates with double shell hollow sphere morphology were prepared by hydrothermal method with ultra-high temperature calcined, and used in the field of electromagnetic (EM) wave absorption. By characterizing the chemical composition, crystal structure, micro morphology and EM parameters of the several materials, the evaluation results of EM wave absorption capacity of the materials were obtained. In the discussion section, we will discuss the reasons for the differences in EM wave absorption capabilities of the several silicates from multiple aspects such as EM wave absorption mechanism in detail. Especially for iron-based silicate (HGMs@Fe₂SiO₄) materials, after reasonable composition and morphology design, the minimum reflection loss (RL_min) reached up to -41.14 dB with a matching thickness (d) of 3.4 mm, and the corresponding effective absorption bandwidth (f_E, RL < -10 dB) was 6.80 GHz. Because of the wide EM wave absorption bandwidth, light weight and low water absorption, this kind of double shell silicate material has gained huge application potential in the EM wave absorption field.

Key words: Magnetic silicate composite, Electromagnetic wave absorption, Impendance matching

Di Lan, Zehao Zhao, Zhenguo Gao, Kaichang Kou, Hongjing Wu. Novel magnetic silicate composite for lightweight and efficient electromagnetic wave absorption[J]. J. Mater. Sci. Technol., 2021, 92: 51-59.

Figures/Tables 9

Fig. 1. Preparation flowchart of the four samples.

Fig. 2. XRD patterns, Raman spectrum and crystal models of CSO (a), FSO (b), NSO (c) and MSO (d).

Fig. 3. XPS high-resolution spectra of the four samples: (a): Full spectrum, (b) O 1 s, (C) Si 2p, (d) Co 2p of CSO, (e) Fe 2p of FSO, (f) Ni 2p of NSO, and (g) Mn 2p of MSO.

Fig. 4. Morphologies and elemental mapping images of CSO (1st line), FSO (2nd line), NSO (3rd line) and MSO (4th line).

Fig. 5. Relevant EM parameters of CSO (a-c), FSO (d-f), NSO (g-i) and MSO (j-l). Frequency dependence of ε’, ε”, μ’ and μ” (a, d, g and j), dielectric and magnetic loss tangent (b, e, h and k), attenuation constant α and μ′′(μ′)-2f-1 values (c, f, i and l).

Fig. 6. 1D, 2D and 3D diagram of the RL value changing with frequency and thickness: (a-c) CSO, (d-f) FSO, (g-i) NSO and (j-l) MSO.

Fig. 7. EM wave absorption mechanisms of FSO.

Fig. 8. EM wave absorption performance of HGMs based EMWAs.

Table 1 EM wave absorption performance of HGMs based EMWAs.

Samples	RL_min (dB)	f_E (GHz)	Thickness (mm)	Percentage (wt.%)	Refs.
HGMs@Co	-25.0	2.2	2.0	10	[33]
HGMs@FeCoNiB	-28.0	3.9	3.3	33	[34]
HGMs@Ni_0.7Zn_0.3Fe₂O₄	-13.8	2.6	3.0	50	[35]
HGMs/Fe₃O₄	-30.0	2.0	1.5	70	[36]
HGMs@FeNiP	-49.2	2.2	5.0	25	[37]
HGMs@ppy/CoFe₂O₄	-14.5	2.9	2.6	50	[38]
HGMs/Ni	-35.0	2.0	3.0	40	[39]
HGMs@Ni	-16.0	1.1	3.5	30	[40]
HGMs@Fe₃O₄	-20.0	4.0	2.6	80	[41]
HGMs@Co(OH)₂	-17.3	5.1	3.2	20	[19]
HGMs@Co₂SiO₄	-46.7	5.9	2.9	20	[19]
HGMs@Fe₂SiO₄	-41.1	6.8	3.4	50	This work

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