摘要
Perovskite has emerged as a novel absorbing material due to its superior electrical conductivity, high coordination number, and structural controllability. Aiming at the problem of narrow absorption bandwidth caused by the limitation of electromagnetic wave attenuation in the single dielectric loss mechanism, this paper innovatively constructed a cooperative loss system by introducing a high-entropy effect in perovskite. By carefully selecting elements, controlling particle size, and the use of high-entropy effect to reduce material melting point, we successfully synthesized a novel high-entropy perovskite ceramic Sr(Cr 1/5 Mn 1/5 Fe 1/5 Co 1/5 Ni 1/5 )O 3-x via solid-phase one-step sintering. The phase composition, microstructure, magnetic properties, and microwave absorbing characteristics were systematically investigated. Experimental results demonstrate that when sintered at 1300 °C, the sample achieves a minimum reflection loss of −41.69 dB at 13.68 GHz, with a maximum effective absorbing bandwidth of 7.25 GHz at 2.10 mm. Meanwhile, its electromagnetic wave absorbing performance can effectively cover the C, X, and Ku frequency bands (4–18 GHz), demonstrating excellent wideband characteristics. This broadband absorption property makes the material suitable for multi-frequency and complex electromagnetic environments. The component regulation strategy based on high-entropy design not only successfully induces the magnetic-dielectric synergy effect, but also significantly improves the wideband electromagnetic wave absorption performance of the material, thereby effectively solving the problem of narrow absorption bandwidth of traditional absorbing materials. Compared with the liquid-phase method and the traditional solid-phase method, the one-step sintering of the solid-phase method significantly improves the synthesis efficiency, providing strong support for large-scale production applications and having practical application prospects.
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