scholarly journals Photogeneration of coherent shear phonons in orientated wurtzite semiconductors by piezoelectric coupling

2009 ◽  
Vol 80 (19) ◽  
Author(s):  
Yu-Chieh Wen ◽  
Tsung-Shine Ko ◽  
Tien-Chang Lu ◽  
Hao-Chung Kuo ◽  
Jen-Inn Chyi ◽  
...  
Keyword(s):  
Piezoelectric Coupling ◽  
Wurtzite Semiconductors

scholarly journals Design and Analysis of a While-Drilling Energy-Harvesting Device Based on Piezoelectric Effect

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1266
Author(s):  
Jun Zheng ◽  
Bin Dou ◽  
Zilong Li ◽  
Tianyu Wu ◽  
Hong Tian ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Material ◽  
Longitudinal Vibration ◽  
Coupling Model ◽  
Energy Harvest ◽  
Peak Voltage ◽  
Piezoelectric Patch ◽  
Theoretical Support ◽  
Piezoelectric Coupling ◽  
Continuous Power

A while-drilling energy harvesting device is designed in this paper to recovery energy along with the longitudinal vibration of the drill pipes, aiming to serve as a continuous power supply for downhole instruments during the drilling procedure. Radial size of the energy harvesting device is determined through the drilling engineering field experience and geological survey reports. A piezoelectric coupling model based on the selected piezoelectric material was established via COMSOL Multiphysics numerical simulation. The forced vibration was analyzed to determine the piezoelectric patch length range and their best installation positions. Modal analysis and frequency response research indicate that the natural frequency of the piezoelectric cantilever beam increased monotonously with the increase of the piezoelectric patch’ thickness before reaching an inflection point. Moreover, the simulation results imply that the peak voltage of the harvested energy varied in a regional manner with the increase of the piezoelectric patches. When the thickness of the piezoelectric patches was 1.2–1.4 mm, the designed device gained the best energy harvest performance with a peak voltage of 15–40 V. Works in this paper provide theoretical support and design reference for the application of the piezoelectric material in the drilling field.

Acoustic beam-scanning by optical control of piezoelectric coupling

1969 ◽  
Vol 57 (4) ◽  
pp. 713-714 ◽  
Author(s):  
B.A. Auld ◽  
D.C. Webb ◽  
D.K. Winslow
Keyword(s):  
Optical Control ◽  
Acoustic Beam ◽  
Beam Scanning ◽  
Piezoelectric Coupling

NEW PIEZOELECTRIC SUBSTRATES FOR SAW DEVICES

2000 ◽  
Vol 10 (04) ◽  
pp. 1017-1068 ◽  
Author(s):  
JOHN A. KOSINSKI
Keyword(s):  
Power Flow ◽  
Piezoelectric Materials ◽  
Low Cost ◽  
Temperature Phase ◽  
Flow Angle ◽  
Recent Developments ◽  
Temperature Coefficient Of Frequency ◽  
Piezoelectric Coupling ◽  
Strong Candidate ◽  
Diffraction Effects

Recent developments in single crystal piezoelectric materials have focused on the search for "ideal" materials with zero temperature coefficient of frequency orientations featuring jointly high piezoelectric coupling, high intrinsic Q, zero power flow angle, and minimized diffraction effects. In addition, the desired materials should have no low temperature phase transitions, and a physical chemistry conducive to repeatable, low cost growth and wafer scale device production. As difficult as it might seem to find such "ideal" materials, three completely different but strong candidate materials have emerged recently: the quartz homeotype gallium orthophosphate, the quartz isotype calcium gallo-germanates (langasite, langanite, langatate, etc.), and diomignite (lithium tetraborate). The current state-of-the-art and prospects for future development of these materials are considered.

Semiempirical tight-binding band structures of wurtzite semiconductors: AlN, CdS, CdSe, ZnS, and ZnO

1983 ◽  
Vol 28 (2) ◽  
pp. 935-945 ◽  
Author(s):  
Akiko Kobayashi ◽  
Otto F. Sankey ◽  
Stephen M. Volz ◽  
John D. Dow
Keyword(s):  
Tight Binding ◽  
Band Structures ◽  
Wurtzite Semiconductors

The tuning effect of the electric field on the physical properties of some typical wurtzite semiconductors

2017 ◽  
Vol 31 (33) ◽  
pp. 1750310 ◽  
Author(s):  
Jia-Ning Li ◽  
San-Lue Hu ◽  
Hao-Yu Dong ◽  
Xiao-Ying Xu ◽  
Jia-Fu Wang ◽  
...  
Keyword(s):  
Electric Field ◽  
Physical Properties ◽  
First Principles ◽  
Electronic Structures ◽  
Density Functional ◽  
Great Influence ◽  
Semiconductor Materials ◽  
Functional Theory ◽  
The Stability ◽  
Wurtzite Semiconductors

Under the tuning of an external electric field, the variation of the geometric structures and the band gaps of the wurtzite semiconductors ZnS, ZnO, BeO, AlN, SiC and GaN have been investigated by the first-principles method based on density functional theory. The stability, density of states, band structures and the charge distribution have been analyzed under the electric field along (001) and (00[Formula: see text]) directions. Furthermore, the corresponding results have been compared without the electric field. According to our calculation, we find that the magnitude and the direction of the electric field have a great influence on the electronic structures of the wurtzite materials we mentioned above, which induce a phase transition from semiconductor to metal under a certain electric field. Therefore, we can regulate their physical properties of this type of semiconductor materials by tuning the magnitude and the direction of the electric field.

Optic and Piezoelectric Coupling in the Sol-Gel PLZT Electroceramics

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.

A New Type Multi-Mode Linear Ultrasonic Motor

2011 ◽  
Vol 189-193 ◽  
pp. 2961-2964 ◽  
Author(s):  
Tie Min Zhang ◽  
Luo Ping ◽  
Liang Li
Keyword(s):  
Longitudinal Mode ◽  
Tangential Direction ◽  
Ultrasonic Motor ◽  
Finite Element Software ◽  
Linear Ultrasonic Motor ◽  
Bending Mode ◽  
Exciting Frequency ◽  
New Type ◽  
Piezoelectric Coupling ◽  
Multi Mode

A prototype for multi-mode linear ultrasonic motor has been proposed and designed. It is designed using a combination of the first longitudinal and the first bending mode. The piezoelectric ceramics convert energy using the longitudinal d33 effect which allows an improved reliability, large vibration amplitudes and excellent piezoelectric coupling. The normal direction motion of the driving element is excited by the first longitudinal mode. The tangential direction motion of the driving element is excited by the first bending mode. The resulting displacement of the driving element is transmitted by the frictional force between the vibrator and the rail in a linear motion. The analysis on the modals of the composite vibrator by using the ANSYS finite element software has been presented in this paper. Finally, the vibrator structure of the motor and the motor's own structures are designed. The basic design is discussed and simulations are compared with the experimental results, the results show that the motor characteristics can be optimized for a particular task by choosing the appropriate operating parameters such as exciting voltage, exciting frequency and normal force.

Piezoelectric coupling in a field-effect transistor with a nanohybrid channel of ZnO nanorods grown vertically on graphene

Nanoscale ◽  
2014 ◽  
Vol 6 (24) ◽  
pp. 15144-15150 ◽  
Author(s):  
Vinh Quang Dang ◽  
Do-Il Kim ◽  
Le Thai Duy ◽  
Bo-Yeong Kim ◽  
Byeong-Ung Hwang ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Zno Nanorods ◽  
Piezoelectric Coupling ◽  
Effect Transistor
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