Finite element modelling of bilayer porous PZT structures with improved hydrostatic figures of merit

2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM) Pub Date : 2017-05-01 DOI:10.1109/ISAF.2017.8000217

J. Roscow, R. Lewis, John Taylor, C. Bowen

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引用次数: 1

Abstract

A finite element model is presented in which bilayer lead zirconate titanate (PZT) structures that are formed from a dense layer and a porous layer are investigated for their hydrostatic sensing properties. The model simulates the poling of the porous ferroelectric material to determine the distribution of poled material throughout the structure. The fraction of PZT successfully poled is found to be closely related to resulting piezoelectric and dielectric properties of the composite. Structures with high layer porosity (>40 vol.%) and porous layer relative thickness (>0.5) were found to have a significantly improved hydrostatic piezoelectric coefficient, dh, hydrostatic voltage coefficient, gh, and hydrostatic figure of merit, dh.gh. The highest dh.gh of 7.74 × 10⁻¹² m²/N was observed in the structure with a porous layer relative thickness of 0.6 and porosity of 60 vol.%, which was more than 100 times higher than that for dense PZT (dh.gh = 0.067 × 10⁻¹² m²/N) and over three times that of PZT with 60 vol.% porosity with 3-3 connectivity (dh.gh = 2.19 × 10⁻¹² m²/N). The results demonstrate the potential for layered porous materials for use in hydrophones.

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具有改进的流体静力特性的双层多孔PZT结构的有限元建模

建立了由致密层和多孔层组成的双层锆钛酸铅(PZT)结构的有限元模型，研究了其流体静力传感性能。该模型模拟了多孔铁电材料的极化过程，以确定极化材料在整个结构中的分布。成功极化的PZT分数与复合材料的压电和介电性能密切相关。高孔隙率(>40 vol.%)和多孔层相对厚度(>0.5)的结构具有显著提高的静水压电系数dh、静水电压系数gh和静水优值dh.gh。最大的dh。多孔层相对厚度为0.6，孔隙率为60 vol.%，高为7.74 × 10−12 m2/N，比致密PZT (dh. %)高100倍以上。gh = 0.067 × 10−12 m2/N)，是PZT的3倍以上，孔隙率为60 vol.%，连通性为3-3 (dh。gh = 2.19 × 10−12 m2/N)。结果表明层状多孔材料用于水听器的潜力。

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2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM)

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