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Preparation of CoFe2O4/CoFe Particles with Broadband Microwave Absorption by Hydrogen Reduction

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Journal of Superconductivity and Novel Magnetism Aims and scope Submit manuscript

Abstract

In this work, CoFe2O4/CoFe particles were prepared by two steps methods of ethylene glycol solvothermal and hydrogen reduction. The structure and morphology of the samples were characterized by X-ray diffraction and field-emission scanning electron microscopy. The samples were mixed with paraffin wax at a mass ratio of 3:1 to prepare rings with an inner diameter of 3.04 mm and an outer of 7 mm, and its electromagnetic parameters were measured by a network vector analyzer. The results show that the dielectric loss and magnetic loss of the composites can be improved after high temperature hydrogen reduction. The optimal reflection loss of −52.14 dB can be achieved at 12.34 GHz in a thickness of only 1.7 mm, when CoFe2O4 was annealed at 500°C for three hours, and the obtained particles can reach less than −20 dB in all C, X, and Ku bands. In all the samples annealing under 500–700°C, the maximum absorption bandwidth over 5.0 GHz can be observed. By comparing the impedance matching properties of CoFe2O4 precursor and CoFe2O4/CoFe composites, it is found that the tunability of the electromagnetic property in composite structure contributes to the excellent electromagnetic wave absorbing performances.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, People’s Republic of China

    Yanzi Liu, Yuchang Su, Jing Zhang, Qiaoqiao Dong & Congcong Shi

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  1. Yanzi Liu
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  2. Yuchang Su
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  5. Congcong Shi
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Correspondence to Yuchang Su.

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Liu, Y., Su, Y., Zhang, J. et al. Preparation of CoFe2O4/CoFe Particles with Broadband Microwave Absorption by Hydrogen Reduction. J Supercond Nov Magn 34, 2217–2225 (2021). https://doi.org/10.1007/s10948-021-05876-0

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