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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Novel lead-free composites with two porosity levels: large piezoelectric anisotropy and high sensitivity
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Novel lead-free composites with two porosity levels: large piezoelectric anisotropy and high sensitivity

机译：具有两个孔隙率水平的新型无铅复合材料：大型压电各向异性和高灵敏度

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摘要

A novel lead-free 1-3-type composite based on a ferroelectric domain-engineered single crystal is put forward. In the porous polymer matrix of this composite, two different porous structures are observed, and the effect of these structures on the piezoelectric performance, electromechanical coupling and related anisotropy parameters of 1-3-type composites is first studied. New diagrams that link the volume fractions of the single-crystal component and the porous regions in the polymer medium are built to show validity of conditions for a large anisotropy of piezoelectric coefficients d*(3j) and electromechanical coupling factors k*(3j), k*(t) and k*(p). In the composites based on the complex alkali niobate alkali tantalate single crystal with small piezoelectric anisotropy (d(33)((1))/vertical bar d(31)((1))vertical bar = 2.1), the three anisotropy factors d*(33)/vertical bar d*(31)vertical bar >= 5, k*(33)/vertical bar k*(31)vertical bar >= 5 and k*(t)/vertical bar k*(p)vertical bar >= 5 hold simultaneously due to the presence of layers with heavily prolate and heavily oblate air pores in the porous polymer matrix. The two porosity levels influence the elastic anisotropy of the porous matrix, and this leads to an increase in the three anisotropy factors across wide volume-fraction ranges. Of independent interest is the high piezoelectric sensitivity of the composites for which the condition g*(33) >= 1 V m N-1 holds at their piezoelectric coefficient d*(33) approximate to (200-500) pC N-1 and electromechanical coupling factors k*(33) approximate to k*(t) approximate to 0.8-0.9. The studied parameters of the novel piezo-active 1-3-type composites are of value for various applications such as active elements of piezoelectric transducers, energy-harvesting devices and sensors.
机译：基于铁电结构域的工程化单结晶的新型无铅1-3型复合物被提出。在这种复合物的多孔聚合物基体，两种不同的多孔结构中观察到，并且在压电性能，机电耦合和1-3型复合材料相关的各向异性参数这些结构的效果首先研究。的是，在聚合物介质链接单晶组分的体积分数和多孔区域新图在建造时，显示的条件的有效性要大的各向异性压电系数D *（3J）和机电耦合系数K *（3J）， K *（t）和K *（p）。在基于复杂碱铌碱钽单小的压电各向异性（d（33）（（1））/竖线d（31）（（1））竖线= 2.1）晶体的复合材料，这三个各向异性因素ð *（33）/竖线d *（31）垂直条> = 5，K *（33）/垂直条K *（31）垂直条> = 5以及k *（t）的/垂直条K *（p）的竖线> = 5保持同时由于层的存在有重扁长和重扁圆空气孔在多孔聚合物基质中。两个孔隙率水平影响多孔基体的弹性各向异性，这导致增加跨越宽体积分数范围三个各向异性因素。独立感兴趣的是其中所述病症克*（33）> = 1个V M N-1保持在它们的压电系数d *复合材料的高的压电灵敏度（33）近似于（200-500）PC N-1和机电耦合系数K *（33）近似为k *（t）的近似至0.8-0.9。新颖的压电有源1-3型复合材料的研究参数是用于各种应用，例如压电换能器的有源元件，能量采集设备和传感器值。

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