Preparation and microwave absorption properties of CoFe2O4/NiCo2O4 composite powders

Khanahmadi, S.; Masoudpanah, S.M.

doi:10.1016/j.ceramint.2023.12.299

Cited by 8 publications

(1 citation statement)

References 66 publications

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“…The composite material exhibited a maximum R L value of −48.2 dB at 15.6 GHz, simultaneously achieving a wide EAB of 5.1 GHz at a thickness of 1.9 mm. Among various magnetic substances, cobalt ferrite (CoFe 2 O 4 ) stands out for its stable chemical and excellent magnetic properties [14,15]. Additionally, it has been confirmed that the magnetic loss of iron oxide can be improved by doping it with rare-earth ions [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

Shang,

Zhu,

Shang

et al. 2024

Molecules

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A novel low-density composite for the absorption of microwaves was prepared by loading La-doped spinel cobalt ferrite (La-CFO) onto biomass carbon (BC) derived from corn stalks using a hydrothermal method. This composite (La-CFO@BC) not only maintained the advantageous properties of low density and abundant porosity, but also exhibited a unique morphology, with La-CFO displaying a carpet-like structure interspersed with dandelion-shaped particles. The incorporation of La-CFO effectively tuned the electromagnetic parameters of the composite, thereby improving its impedance-matching attributes and its ability to absorb microwave radiation. At a frequency of 12.8 GHz for electromagnetic waves and with a thickness of 2.5 mm, La-CFO@BC demonstrated remarkable performance in microwave absorption, attaining a noteworthy minimum reflection (RLmin) of −53.2 dB and an effective absorption bandwidth (EAB) of 6.4 GHz. Furthermore, by varying the thickness of the La-CFO@BC within the range of 1.0 to 5.5 mm, the EAB could be broadened to 13.8 GHz, covering the entire X-band, the entire Ku-band, and a substantial portion of the C-band. This study demonstrated that La-CFO@BC was a promising alternative for electromagnetic wave attenuation, which offered superior performance in microwave absorption.

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