Microwave Absorption of α-Fe2O3@diatomite Composites

Autor: Chenzhi Zhang, Dashuang Wang, Lichao Dong, Kailin Li, Yifan Zhang, Pingan Yang, Shuang Yi, Xingjian Dai, Changqing Yin, Zhilan Du, Xinfang Zhang, Quan Zhou, Zhiyu Yi, Jinsong Rao, Yuxin Zhang
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: International Journal of Molecular Sciences, Vol 23, Iss 16, p 9362 (2022)
Druh dokumentu: article
ISSN: 23169362
1422-0067
1661-6596
DOI: 10.3390/ijms23169362
Popis: 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.
Databáze: Directory of Open Access Journals
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