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李玉坤、李维等撰写的论文被Adv. Opt. Mater.接收

发布时间:2018-08-21
       李玉坤、李维等人撰写的论文"Refractory metamaterial microwave absorber with strong absorption insensitive to temperature" (adom.201800691) Wiley-VCH出版社工程技术一区Top期刊Advanced Optical Materials(影响因子:7.430)接收。在该论文中,我们首次设计并实验演示了一种对温度变化不敏感的耐高温吸波超材料。这种超材料采用导电TiB2耐温陶瓷作为结构单元,氧化铝作为介质,做成三层夹心结构。它能在宽温度范围内表现出强吸收行为。同时,我们还给出了这种吸波超材料的物理含义清晰的等效电路模型,阐明了材料结构和材料参数对其吸波行为的影响规律;指出了其吸波行为对温度不敏感的原因。也发现了其在高温下具有良好的耐久性,表明这类吸波超材料在高温吸波领域具有良好的应用前景。
       原文详细摘要如下:The so far developed microwave absorbers all exhibit dramatically changing absorption with temperature, hindering them from working in a broad temperature range. Here, we design and experimentally demonstrate a refractory metamaterial microwave absorber (rfMMA) with the absorption insensitive to temperature by using refractory ceramics of conductive titanium diboride (TiB2) as unit cells and dielectric alumina (Al2O3) as a spacer. The as-proposed rfMMA shows strong microwave absorption in a wide temperature range. A definite physical equivalent circuit model that tightly links the structural and constitutive parameters of the rfMMA to its absorption properties is established. It reveals that with a stable configuration of the as-proposed rfMMA, the little temperature effect on the permittivity of Al2O3 spacer and the big enough conductivity of TiB2 unit cells ensure an almost constant absorption in a wide temperature range, avoiding the temperature-sensitive problem of traditional refractory absorbers. Moreover, the excellent chemical stability of TiB2 and Al2O3 at high temperature further ensures the long-term service of the as-fabricated rfMMA, as confirmed by experiments. This work provides a route to achieve refractory microwave absorbers with strong absorption at a wide temperature range, and illustrates a bright prospect of the all-ceramic metamaterial absorbers in high temperature applications.
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