Piezoelectric Effects

In one-dimensional hexagonal piezoelectric quasi-crystals, there exist the phonon–phason, electro–phonon, and electro–phason couplings. Therefore, the phonon–phason coupling and piezoelectric effects on axial guided wave characteristics in one-dimensional hexagonal functionally graded piezoelectric quasi-crystal (FGPQC) cylinders are investigated by utilizing the Legendre polynomial series method. The dispersion curves and cut-off frequencies are illustrated. Wave characteristics in three hollow cylinders with different quasi-periodic directions are comparatively studied. Some new wave phenomena are revealed: the phonon–phason coupling and piezoelectric effects on the longitudinal and torsional phonon modes ( N = 0) vary as the quasi-periodic direction changes; the phonon–phason coupling effect on flexural–torsional modes in the r-, z-FGPQC hollow cylinders, and on flexural–longitudinal modes in ϑ-FGPQC hollow cylinders increases as N increases. The corresponding results obtained in this work lay the theoretical foundation for the design and manufacture of piezoelectric transducers with high resolution and energy-conversion efficiency.

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Studies on the electrostatic effects of stretched PVDF films and nanofibers

Nanoscale Research Letters ◽

10.1186/s11671-021-03536-9 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Yixuan Lin ◽

Yuqiong Zhang ◽

Fan Zhang ◽

Meining Zhang ◽

Dalong Li ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Polarized Light ◽

Transition Process ◽

Open Circuit ◽

Wearable Electronics ◽

Energy Harvesters ◽

Β Phase ◽

Poly Vinylidene Fluoride ◽

Piezoelectric Effects ◽

Energy Harvesting Devices

AbstractThe electroactive β-phase in Poly (vinylidene fluoride, PVDF) is the most desirable conformation due to its highest pyro- and piezoelectric properties, which make it feasible to be used as flexible sensors, wearable electronics, and energy harvesters etc. In this study, we successfully developed a method to obtain high-content β-phase PVDF films and nanofiber meshes by mechanical stretching and electric spinning. The phase transition process and pyro- and piezoelectric effects of stretched films and nanofiber meshes were characterized by monitoring the polarized light microscopy (PLM) images, outputting currents and open-circuit voltages respectively, which were proved to be closely related to stretching ratio (λ) and concentrations. This study could expand a new route for the easy fabrication and wide application of PVDF films or fibers in wearable electronics, sensors, and energy harvesting devices.

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A Phononic Crystal with Differently Configured Double Defects for Broadband Elastic Wave Energy Localization and Harvesting

Crystals ◽

10.3390/cryst11060643 ◽

2021 ◽

Vol 11 (6) ◽

pp. 643

Author(s):

Soo-Ho Jo ◽

Byeng D. Youn

Keyword(s):

Elastic Wave ◽

Wave Energy ◽

Phononic Crystal ◽

Square Lattice ◽

Energy Localization ◽

Piezoelectric Patch ◽

Single Defect ◽

Piezoelectric Energy ◽

Piezoelectric Effects ◽

Elastic Wave Energy

Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems to broaden the bandwidth. However, these prior studies are limited to examining an identical configuration of the double defects. Therefore, this paper aims to propose a new design concept for PnCs that examines differently configured double defects for broadband elastic wave energy localization and harvesting. For example, a square-pillar-type unit cell is considered and a defect is considered to be a structure where one piezoelectric patch is bonded to a host square lattice in the absence of a pillar. When the double defects introduced in a PnC are sufficiently distant from each other to implement decoupling behaviors, each defect oscillates like a single independent defect. Here, by differentiating the geometric dimensions of two piezoelectric patches, the defects’ dissimilar equivalent inertia and stiffness contribute to individually manipulating defect bands that correspond to each defect. Hence, with adequately designed piezoelectric patches that consider both the piezoelectric effects on shift patterns of defect bands and the characteristics for the output electric power obtained from a single-defect case, we can successfully localize and harvest the elastic wave energy transferred in broadband frequencies.

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Harvesting energy from pavement based on piezoelectric effects: Fabrication and electric properties of piezoelectric vibrator

Journal of Renewable and Sustainable Energy ◽

10.1063/1.5002731 ◽

2018 ◽

Vol 10 (5) ◽

pp. 054701 ◽

Cited By ~ 16

Author(s):

Rui Li ◽

Yi Yu ◽

Bochao Zhou ◽

Qiqi Guo ◽

Mingming Li ◽

...

Keyword(s):

Electric Properties ◽

Piezoelectric Vibrator ◽

Piezoelectric Effects

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Analysis of the quadratic retardation induced by the Pockels, Kerr, and inverse piezoelectric effects in anX-cutY-propagation LiNbO3

Japanese Journal of Applied Physics ◽

10.7567/jjap.53.052601 ◽

2014 ◽

Vol 53 (5) ◽

pp. 052601

Author(s):

Kuniharu Takizawa ◽

Koshi Haraguchi ◽

Lianhua Jin ◽

Seiichi Suzuki

Keyword(s):

Piezoelectric Effects

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Optic and Piezoelectric Coupling in the Sol-Gel PLZT Electroceramics

Materials Science Forum ◽

10.4028/www.scientific.net/msf.730-732.129 ◽

2012 ◽

Vol 730-732 ◽

pp. 129-134

Author(s):

Lucjan Kozielski ◽

Malgorzata Plonska

Keyword(s):

Uv Light ◽

Sol Gel ◽

Light Illumination ◽

Piezoelectric Effects ◽

Piezoelectric Coupling ◽

Wireless Device ◽

Organometallic Precursors ◽

Gain Adjustment ◽

Piezoelectric Transformers ◽

Sintering Method

PZT ceramic system with presence of La contents, have been proposed and prepared using sol gel sintering method for practical application of photostriction, which is the superposition of photovoltaic and piezoelectric effects. Such a ceramics produced by conventional mixing oxide method does not exhibit photostrictive properties due to the defects and inhomogeneous distribution of grains and pores. In this study, an investigated lanthanium(III) doped PZT ceramics were obtained by sol-gel technique from the organometallic precursors. It was found that fabricated material were effective in the enhancement of photovoltaic and photostrictive properties. Consequently, lanthanium influence deviation of piezoelectric parameters were studied as a function UV light illumination. For the determination lighting dependancy of the transformation parameters the resonant and antiresonant method was implemented. The improved Piezoelectric Transformer structure successfully changed gain characteristics proportionally to light intensity. The authors invention of a light driven output gain adjustment in Piezoelectric Transformers (PT) yields a novel “smart” multifunctional wireless device. This new created application area can be utilized in self-adopting shutters in photo cameras due to improved sensitivity to surrounding illumination conditions.

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Recent Advances in Low-Dimensional Janus Materials: a Theory and Simulation Perspective

Materials Advances ◽

10.1039/d1ma00660f ◽

2021 ◽

Author(s):

Wenjin Yin ◽

Huajian Tan ◽

Peijia Ding ◽

Bo Wen ◽

Xi-Bo Li ◽

...

Keyword(s):

Transition Metal ◽

Band Gaps ◽

Metal Chalcogenides ◽

Electronic Band ◽

Recent Advances ◽

Piezoelectric Effects ◽

Transition Metal Chalcogenides ◽

Low Dimensional

Owing to highly peculiar properties such as tunable electronic band gaps and coexistence of Rashba, excitonic and piezoelectric effects, low-dimensional Janus transition metal chalcogenides (TMDs) have received growing attention across...

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