Microwave Absorption Properties of Double-layer Absorbing Coatings Based on Ni0.4Co0.2Zn0.4Fe2O4 and BaTiO3 Nanofibers

doi:10.15541/jim20140521

Abstract

Abstract:

BaTiO₃(BTO) nanofibers (NFs) and Ni_0.4Co_0.4Zn_0.4Fe₂O₄ (NCZFO) NFs with average diameters of about 180 nm and 220 nm, respectively, were prepared by electrospinning method. Their phase structures, surface morphologies and electromagnetic parameters were characterized by X-ray diffraction (XRD), field mission scanning electron microscope (FESEM) and vector network analyzer. Microwave absorption properties of both single- and double-layer silicone rubber based absorbing coatings with either 70wt% BTO NFs or NCZFO NFs as microwave absorbents were evaluated according to the transmission line theory in the frequency range of 2–18 GHz. The results show that the double-layer absorbing coatings with the NCZFO NFs/silicone rubber composite (S1) as matching layer and the BTO NFs/silicone rubber composite (S2) as absorbing layer display superior microwave absorbing performance compared to the single-layer ones due to the proper combination of magnetic loss of NCZFO NFs and dielectric loss of BTO NFs, and the improved impedance matching characteristics. The double-layer absorbing coatings have a reflection loss (RL) of less than –20 dB over the frequency range of 4.9–18 GHz through appropriately adjusting the thicknesses of the absorbing layer and matching layer. When the thicknesses of the absorbing layer and the matching layer are 2.3 and 0.5 mm, respectively, the minimum RL reaches –87.8 dB at 9.5 GHz and the absorption bandwidth with the RL values below –20 dB is up to 5 GHz. The optimal NCZFO NFs/BTO NFs double-layer absorbing coatings can become a novel microwave absorption material with strong-absorption and broad-band.

Key words: Ni-Co-Zn ferrite nanofiber, BaTiO₃ nanofiber, electrospinning, double-layer absorber, microwave absorption properties

CLC Number:

TM25
TQ343

LI Jia-Le, XIANG Jun, YE Qin, LIU Min, SHEN Xiang-Qian. Microwave Absorption Properties of Double-layer Absorbing Coatings Based on Ni_0.4Co_0.2Zn_0.4Fe₂O₄ and BaTiO₃ Nanofibers[J]. Journal of Inorganic Materials, 2015, 30(5): 479-486.

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Microwave Absorption Properties of Double-layer Absorbing Coatings Based on Ni_0.4Co_0.2Zn_0.4Fe₂O₄ and BaTiO₃ Nanofibers

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