Suppressed conductive loss of flower-like NiCo 2 O 4 -wrapped flaky FeSiAl for excellent low-frequency microwave absorption
Abstract Flaky FeSiAl is a high potential absorbent for low-frequency microwave applications. However, impedance mismatching due to its excessively high complex permittivity presents a challenge. Herein, inspired by the surface modification strategy, flaky FeSiAl wrapped with flower-like NiCo 2 O 4...
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Published in | Journal of physics. D, Applied physics Vol. 57; no. 33; p. 335001 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
23.08.2024
|
Online Access | Get full text |
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Summary: | Abstract
Flaky FeSiAl is a high potential absorbent for low-frequency microwave applications. However, impedance mismatching due to its excessively high complex permittivity presents a challenge. Herein, inspired by the surface modification strategy, flaky FeSiAl wrapped with flower-like NiCo
2
O
4
(NiCo
2
O
4
@flaky FeSiAl) was developed via a hydrothermal method. The introduction of a surface NiCo
2
O
4
insulating layer was expected to reduce the complex permittivity and increase the high complex permeability in the NiCo
2
O
4
@flaky FeSiAl composite. Subsequently, an excellent low-frequency microwave absorption performance was achieved. The designed NiCo
2
O
4
@flaky FeSiAl displayed a robust minimum refection loss (
RL
min
) of −33.41 dB at 6.32 GHz and increased the effective absorption bandwidth (EAB,
RL <
−10 dB) to 4.08 GHz when the matching thickness was 1.6 mm. The enhanced low-frequency microwave absorption performance was mainly attributed to the improvement in impedance matching, which originated from the collaborative regulation of electromagnetic parameters. This study provides a promising approach for designing flaky FeSiAl-based composites and high-performance low-frequency microwave absorbents. |
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ISSN: | 0022-3727 1361-6463 |
DOI: | 10.1088/1361-6463/ad4b30 |