层状细胞铁电超材料

Jiahao Shi, H. Akbarzadeh
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摘要

微结构工程已成为调整先进材料整体性能的有效途径。本文受层次化多孔生物材料的启发,揭示了由6个常用的原始立方细胞构成的层次化细胞铁电超材料的多物理性质。提出了多尺度渐近均匀化方法和标度关系方法来预测层状细胞超材料的有效铁电性质。分析了层序、胞体拓扑结构和相对密度等设计参数对有效铁电性能的影响。与相应的1阶单元胞相比,二阶分层胞状铁电超材料表现出显著的改善。例如,杂化二阶T3-2/L3-1 (ρ 1 = 0.2, ρ 2 = 0.25)的归一化fom33为117.49,而一阶L3-1 (ρ = 0.05)的归一化fom33为19.95。提高层状细胞铁电超材料的结构阶序可以进一步提高其有效铁电性能。这项工作强调了超轻分层铁电超材料作为下一代水听器、红外探测器、柔性自供电传感器和热能收集装置的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hierarchical Cellular Ferroelectric Metamaterials
The engineering of microstructures has been adopted as an effective approach to tune the overall performance of advanced materials. In this article, inspired by hierarchical porous biomaterials, the multiphysical properties of hierarchical cellular ferroelectric metamaterials constructed of six commonly used primitive cubic unit cells are elicited. Both multiscale asymptotic homogenization and scaling relationship methods are proposed to predict the effective ferroelectric properties of hierarchical cellular metamaterials. Analysis on the influence of design parameters, e.g. hierarchical order, cell topology, and relative density on their effective ferroelectric figures of merit is conducted. The 2 nd -order hierarchical cellular ferroelectric metamaterial exhibits remarkable improvement compared to the corresponding 1 st -order unit cell. For example, the normalized FOM 33 of hybrid 2 nd -order T3-2/L3-1 ( ρ 1 = 0.2, ρ 2 = 0.25) is 117.49, while it is 19.95 for 1 st -order L3-1 ( ρ = 0.05). Increasing the structural hierarchical order can further improve the effective ferroelectric properties of hierarchical cellular ferroelectric metamaterials. This work highlights the potential of ultralight hierarchical ferroelectric metamaterials as the next generation of hydrophone, IR detector, flexible self-powered sensors, and thermal energy harvesting devices.
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