AI 中文总结
本研究通过激光驱动可控合成实现高熵钙钛矿的极端混合，在600℃下获得9.3 GHz超宽电磁吸收带宽，为高温电磁吸收氧化物吸收剂提供了新设计范式。
AI 中文摘要
在电磁吸收领域，长期以来一直需要开发具有宽带高温电磁吸收性能的氧化物吸收剂，但这类材料的吸收性能仍不尽人意。本研究采用极端混合策略，通过激光驱动可控合成技术，成功在高熵钙钛矿中引入多达13种阳离子元素，其中A位占据8种阳离子、B位占据5种阳离子，实现了高熵钙钛矿的极端混合。这种极端混合最大程度促进了原子级界面的形成，显著放大了原子级界面极化损耗，从而有效耗散电磁波能量，使高熵钙钛矿在600摄氏度下获得了9.3 GHz的超宽有效吸收带宽（EAB），超越了此前报道的氧化物吸收剂。然而，由于电导率大幅增加导致高温下阻抗失配，材料在700摄氏度时的EAB降至4.6 GHz。本研究为开发具有前所未有的高温电磁吸收性能的高熵氧化物吸收剂建立了新的极端混合设计范式。
英文摘要
Developing oxide absorbers with broadband high-temperature electromagnetic absorption performance has long been desirable in the electromagnetic absorption field, yet their absorption performance has remained unsatisfactory. Here, through an extreme mixing strategy, we successfully develop an ultrabroad effective absorption bandwidth (EAB) of 9.3 GHz in high-entropy perovskites up to 600 degree celsius, surpassing the previously reported oxide absorbers. Specifically, we achieve the extreme mixing in high-entropy perovskites by the successful incorporation of up to 13 cation elements, with 8 and 5 cations occupying the A- and B-sites, respectively, using a laser-driven controllable synthesis technique. Such extreme mixing maximally promotes the formation of atomic-scale interfaces to markedly amplify atomic-level interfacial polarization loss for the effective dissipation of electromagnetic wave energy, thereby giving rise to a remarkably broad EAB of 9.3 GHz in high-entropy perovskites up to 600 degree celsius. Owing to the profoundly increased electrical conductivity that causes impedance mismatch at elevated temperatures, however, their EAB deteriorates to 4.6 GHz at 700 degree celsius. This work establishes a new extreme mixing design paradigm for enabling high-entropy oxide absorbers with unprecedented high-temperature EM absorption performance.
