期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 534, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2021.168060
关键词
Dielectric Ti3SiC2; Magnetic CoNi nanoparticles; Electromagnetic properties; Magnetic loss; Microwave absorption
资金
- National Natural Science Foundation of China [51802352]
- Natural Science Foundation of Hunan Province, China [2020JJ4014]
- Research Foundation of Education Bureau of Hunan Province, China [19A116, 20C0467]
- Fundamental Research Funds for the Central Universities of Central South University [2019zzts844]
This study presents a simple low-temperature in situ hydrothermal method to synthesize novel magnetic-dielectric composites with regulated frequency-dependent electromagnetic parameters. It was found that the CoNi/Ti3SiC2 composites exhibited exceptional microwave absorption performance under thinner thickness, which can be attributed to improved attenuation characteristics and optimized impedance matching.
The magnetic-dielectric composites with synergetic magnetic and dielectric losses have exhibited great potential in the practical applications of microwave absorbing material. This paper reports a simple low-temperature in situ hydrothermal approach for synthesizing novel composites composed of the dielectric Ti3SiC2 wrapped with magnetic CoNi nanoparticles. The microstructure, morphology, electromagnetic properties, and microwave absorption performance of as-synthesized samples were investigated. By adjusting the content of formed magnetic CoNi nanoparticles on the surface of Ti3SiC2, obvious regulated frequency-dependence of electromagnetic parameters for the proposed CoNi/Ti3SiC2 composites can be realized. Consequently, the effective absorption bandwidth (RL < -10 dB) and optimal reflection loss value of CoNi/Ti3SiC2-40 composites under thinner thickness of 1.55 mm can reach up to 4.88 GHz and -41.41 dB, respectively. Exceptional microwave absorption performance of the CoNi/Ti3SiC2 composites is attributed to its simultaneously improved attenuation characteristics and optimized impedance matching, and thus can be undoubtedly identified as high-efficiency microwave absorbing material.
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