Longitudinal and transverse piezoelectric effects of ferroelectret metamaterials with positive and negative Poisson's ratios

压电 超材料 横截面 泊松分布 泊松比 辅助 物理 凝聚态物理 材料科学 声学 复合材料 数学 医学 光学 统计 解剖
作者
Qianqian Hu,Tongyan Zhang,G. M. Sessler,Heinz von Seggern,Alexander A. Altmann,Mario Kupnik,Zhiming Shi,Xiaoqing Zhang
出处
期刊:Applied Physics Letters [American Institute of Physics]
卷期号:124 (14) 被引量:1
标识
DOI:10.1063/5.0196696
摘要

A theoretical model has been developed to express the longitudinal and transverse piezoelectric effects in ferro/piezoelectrets. This model is an extension of the classic model based on layer-dielectric structures that focuses on the longitudinal piezoelectric effect. The improved model reveals that the relation between the longitudinal piezoelectric d33 coefficient and the transverse piezoelectric d31 coefficient is associated with Poisson's ratio μ13 (or μ31) and Young's moduli Y1 and Y3. The polarity of the two coefficients is opposite for materials with a positive Poisson's ratio as normally observed in conventional piezoelectric materials, and the same for materials with a negative Poisson's ratio, i.e., auxetic materials. The experimental results available in the literature and obtained from ferroelectret metamaterials with a honeycomb cross-sectional structure and two-dimensional (2D) symmetric structure, called 2D ferroelectret metamaterials, designed and prepared in this study reasonably agree with theoretical predictions. This study not only extends the scope of the metamaterials by inducing the concept of ferroelectret metamaterials but also provides a strategy for designing ferroelectrets with designable properties.
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