首页|Enhanced performance by regulating particle size and coating dielectric layer
Enhanced performance by regulating particle size and coating dielectric layer
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NETL
NSTL
Elsevier
Fe3O4 is an important electromagnetic wave absorption material with both dielectric and magnetic losses. However, the synergistic effect of different particle sizes of Fe3O4 on the absorption performance is less reported, not to mention the effect of coating dielectric layer on Fe3O4. In this paper, the minimum reflection loss of-50.74 dB is obtained for the mixture of Fe3O4-5.5 and the effective bandwidth reaches 4.38 GHz. Meanwhile, the effective bandwidth and reflection loss values can be further improved by covering dielectric TiO2 layer. The effective bandwidth of Fe3O4-5.5@TiO2 increases to 5.36 GHz and the minimum reflection loss lowers to-51.1 dB. The enhanced performance is not only ascribed to space charge polarization and dipole polarization caused by oxygen vacancies in TiO2, but also polarization interface caused by multi-polarization as evidenced from experimental and finite element method simulation. This paper provides a new strategy for preparation of microwave absorption material with enhanced performance.
NETL
NSTL
Elsevier
