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Precursor-directed synthesis of porous cobalt assemblies with tunable close-packed hexagonal and face-centered cubic phases for the effective enhancement in microwave absorption

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Abstract

Metal cobalt is one of the most promising candidates for high-performance microwave absorbers due to its compatible dielectric loss and magnetic loss abilities. Rational design on the microstructure of metal cobalt became a popular way to upgrade its microwave absorption performance in the past decade, while much less attention has been paid to the electromagnetic functions derived from its different crystal structures. Herein, we report the microwave absorption of porous cobalt assemblies with varied composition of close-packed hexagonal (hcp) and face-centered cubic (fcc) phases. Electromagnetic analysis reveals that the change of phase composition can significantly impact the complex permittivity and complex permeability of metal cobalt, where hcp-cobalt favors high complex permittivity and fcc-cobalt produces high complex permeability. The optimum phase composition in these porous cobalt assemblies will promise well-matched characteristic impedance and good performance in strong reflection loss (−41.0 dB at 9.4 GHz) and wide response bandwidth (4.0–17.4 GHz over −10.0 dB). The enhanced microwave absorption is superior to many cobalt absorbers ever reported. It is believed that these results will provide a new pathway to the design and preparation of highly effective metal cobalt and cobalt-based composites as novel microwave absorbers in the future.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (21371039, 21571043, and 21676065) and Natural Science Foundation of Heilongjiang Province (B201405).

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Authors and Affiliations

  1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Ying Wang, Yunchen Du, Di Guo, Rong Qiang, Chunhua Tian, Ping Xu & Xijiang Han

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  1. Ying Wang
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  2. Yunchen Du
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  3. Di Guo
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  4. Rong Qiang
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  5. Chunhua Tian
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Correspondence to Yunchen Du or Xijiang Han.

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Wang, Y., Du, Y., Guo, D. et al. Precursor-directed synthesis of porous cobalt assemblies with tunable close-packed hexagonal and face-centered cubic phases for the effective enhancement in microwave absorption. J Mater Sci 52, 4399–4411 (2017). https://doi.org/10.1007/s10853-016-0687-9

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