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Int J Mol Sci
2022 Aug 19;2316:. doi: 10.3390/ijms23169362.
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Microwave Absorption of α-Fe2O3@diatomite Composites.
Zhang C
,
Wang D
,
Dong L
,
Li K
,
Zhang Y
,
Yang P
,
Yi S
,
Dai X
,
Yin C
,
Du Z
,
Zhang X
,
Zhou Q
,
Yi Z
,
Rao J
,
Zhang Y
.
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A neoteric round sieve diatomite (De) decorated with sea-urchin-like alpha-type iron trioxide (α-Fe2O3) synthetics was prepared by the hydrothermal method and further calcination. The results of the electromagnetic (EM) parameters of α-Fe2O3-decorated De (α-Fe2O3@D) showed that the minimum reflection loss (RLmin) of α-Fe2O3@D could reach -54.2 dB at 11.52 GHz and the matched absorber thickness was 3 mm. The frequency bandwidth corresponding to the microwave RL value below -20 dB was up to 8.24 GHz (9.76-18 GHz). This indicates that α-Fe2O3@D composite can be a lightweight and stable material; because of the low density of De (1.9-2.3 g/cm3), the density of α-Fe2O3@D composite material is lower than that of α-Fe2O3 (5.18 g/cm3). We found that the combination of the magnetic loss of sea-urchin-like α-Fe2O3 and the dielectric loss of De has the most dominant role in electromagnetic wave absorption and loss. We focused on comparing the absorbing properties before and after the formation of sea-urchin-like α-Fe2O3 and explain in detail the effects of the structure and crystal shape of this novel composite on the absorbing properties.
No. 51908092 the National Natural Science Foundation of China, No. 2020CDJXZ001 the Fundamental Research Funds for the Central Universities, No. U1801254 the Joint Funds of the National Natural Science Foundation of China-Guangdong, XmT2018043 the project funded by Chongqing Special Postdoctoral Science Foundation, cstc2017jcyjBX0080 the Chongqing Research Program of Basic Research and Frontier Technology, cstc2019jcyjbsh0079 Natural Science Foundation Project of Chongqing for Post-doctor, KJZDK201800801 Technological projects of Chongqing Municipal Education Commission, CXTDG201602014 the Innovative Research Team of Chongqing, 2019CDXYCL0031 the Innovative technology of New materials and metallurgy
Figure 1. Magnification increases from left to right. SEM images of (a–c) MnO2@D; (d–f) FeOOH@D; (g–i) α-Fe2O3@D.
Figure 2. XRD patterns of De, MnO2@D, FeOOH@D and α-Fe2O3@D. (a) The XPS of α-Fe2O3@D: survey; (b) O 1s; (c) Fe 2p; (d) (M−H) loops of MnO2@D, FeOOH@D and α-Fe2O3@D; (e) Illustration: the relationship between magnetization and magnetic field of the sample is shown in an enlarged view.
Figure 3. Relevant EM parameters of MnO2@D; (a–c) FeOOH@D; (d–f) and α-Fe2O3@D; (g–i). Frequency dependence of ε′, ε″, μ′ and μ″ (a,d,g); dielectric and loss tangent (b,e,h); attenuation constant α and μ″(μ′)−2f−1 values (c,f,i).
Figure 4. One—dimensional, two—dimensional, and three—dimensional picture of the RL values, which varies with frequency and thickness: (a–c) MnO2@D, (d–f) FeOOH@D and (g–i) α-Fe2O3@D.
Figure 5. Microwave absorption mechanism of α-Fe2O3@D composite materials.
Figure 6. Frequency dependence of impedance matching Zr of the MnO2@D, FeOOH@D and α-Fe2O3@D composite material.
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