Methods for improving electromechanical coupling coefficient in two dimensional electric field excited AlN Lamb wave resonators

2015 ◽  
Vol 106 (25) ◽  
pp. 253502 ◽  
Author(s):  
Chengliang Sun ◽  
Bo Woon Soon ◽  
Yao Zhu ◽  
Nan Wang ◽  
Samuel Pei Hao Loke ◽  
...  
Keyword(s):  
Electric Field ◽  
Coupling Coefficient ◽  
Lamb Wave ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Coefficient ◽  
Two Dimensional

Research on Electromechanical Properties of Cymbal Piezocomposite Transducer

2005 ◽  
Vol 475-479 ◽  
pp. 1087-1090
Author(s):  
Deng Hua Li ◽  
Ke Li ◽  
Yang Cheng
Keyword(s):  
Electric Field ◽  
Transmission Coefficient ◽  
Coupling Coefficient ◽  
Applied Electric Field ◽  
Piezoelectric Ceramic ◽  
Electromechanical Coupling ◽  
Applied Force ◽  
Electromechanical Coupling Coefficient ◽  
Electromechanical Properties ◽  
Piezoelectric Phase

The electromechanical properties of cymbal piezocomposite transducer were investigated in this paper. Piezoelectric ceramic PZT—5A was used as piezoelectric phase of transducer, and brass foil was used as end cap electrode of cymbal piezocomposite transducer. Several types of this transducer were fabricated. The displacements of this transducer as functions of the applied force and the applied electric field were investigated. It was calculated and analyzed for the energy transmission coefficient and electromechanical coupling coefficient of this transducer which optimum values were obtained.

The Characterization of Two Dimensional Electrostrictive CuInP2S6 Materials for Transducers

2006 ◽  
Vol 514-516 ◽  
pp. 230-234 ◽  
Author(s):  
Vytautas Samulionis ◽  
Juras Banys ◽  
Yulian Vysochanskii
Keyword(s):  
Electric Field ◽  
Electromechanical Coupling ◽  
Bias Field ◽  
Thin Plates ◽  
Electromechanical Coupling Coefficient ◽  
Two Dimensional ◽  
Coupling Coefficients ◽  
Bias Electric Field ◽  
Two Dimensional Materials ◽  
Dc Electric Field

The electromechanical properties of layered, two-dimensional materials of CuInP2S6 family have been investigated. It was shown that, at room temperature, which is above phase transition and under DC bias electric field, these materials behave as a piezoelectric because of electrostriction. In this case, the piezoelectric and electromechanical coupling coefficients are odd functions of the bias field and have a linear dependence on the bias field. The relative changes of ultrasonic velocity are found to have a quadratic dependence on the bias DC field. In bias fields of about 20 kV/m, the values of square of electromechanical coupling coefficient could be high enough (>20%) for longitudinal vibrations in thin plates of investigated CuInP2(S,Se)6 materials in the paraelectric phase. In the ferroelectric phase, the external DC electric field acts as polarizing field and electromechanical coupling coefficients sufficiently increase. At the transitions, the piezoelectric anomalies have been observed.

A high electromechanical coupling coefficient SH0 Lamb wave lithium niobate micromechanical resonator and a method for fabrication

2014 ◽  
Vol 209 ◽  
pp. 183-190 ◽  
Author(s):  
Roy H. Olsson ◽  
Khalid Hattar ◽  
Sara J. Homeijer ◽  
Michael Wiwi ◽  
Matthew Eichenfield ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Coupling Coefficient ◽  
Lamb Wave ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Coefficient

Sb5+ Modified Phase Transition in (Li, Na, K)(Nb1-xSbx)O3 Piezoelectric Ceramics

2016 ◽  
Vol 848 ◽  
pp. 339-343
Author(s):  
Xiao Kun Zhao ◽  
Bo Ping Zhang ◽  
Lei Zhao ◽  
Li Feng Zhu
Keyword(s):  
Phase Transition ◽  
Phase Boundary ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Piezoelectric Coefficient ◽  
Electromechanical Coupling Coefficient ◽  
Second Phase ◽  
Phase Transition Temperatures ◽  
Two Peaks ◽  
Planar Mode

The modified behavior of the phase transition temperatures (TO-T and/or TC) between orthorhombic (O), tetragonal (T) and cubic (C) that caused by doping Sb5+ in (Li0.052Na0.493K0.455)(Nb1-xSbx)O3 (LNKNSx) ceramics was reported in the present investigation. The results show that differing from the insensitive TO-T to the Sb5+ content, TC splits into two peaks TCI and TCII when doping Sb5+. The decreased TCI by raising x may be ascribed to the Sb-rich grains and the settled TCII round 480 °C resulting from the Sb-lack ones. The enhanced piezoelectric coefficient d33 value of 263 pC/N and planar mode electromechanical coupling coefficient kp value of 42.5% at x=0.052 can be attributed to the polymorphic phase boundary (PPB) behavior with an appropriate ratio between T and O phases without any second phase.

scholarly journals Combined piezoelectric and flexoelectric effects in resonant dynamics of nanocantilevers

2018 ◽  
Vol 29 (20) ◽  
pp. 3949-3959 ◽  
Author(s):  
Adriane G Moura ◽  
Alper Erturk
Keyword(s):  
Barium Titanate ◽  
Frequency Response ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Analytical Framework ◽  
Electromechanical Coupling Coefficient ◽  
Sensors And Actuators ◽  
Energy Harvesters ◽  
Size Dependent ◽  
Resonant Dynamics

We establish and analyze an analytical framework by accounting for both the piezoelectric and flexoelectric effects in bimorph cantilevers. The focus is placed on the development of governing electroelastodynamic piezoelectric–flexoelectric equations for the problems of resonant energy harvesting, sensing, and actuation. The coupled governing equations are analyzed to obtain closed-form frequency response expressions via modal analysis. The combined piezoelectric–flexoelectric coupling coefficient expression is identified and its size dependence is explored. Specifically, a typical atomistic value of the flexoelectric constant for barium titanate is employed in the model simulations along with its piezoelectric constant from the existing literature. It is shown that the effective electromechanical coupling of a piezoelectric material, such as barium titanate, is significantly enhanced for thickness levels below 100 nm. The electromechanical coupling coefficient of a barium titanate bimorph cantilever increases from the bulk piezoelectric value of 0.065 to the combined piezoelectric–flexoelectric value exceeding 0.3 toward nanometer thickness level. Electromechanical frequency response functions for resonant power generation and dynamic actuation also capture the size-dependent enhancement of the electromechanical coupling. The analytical framework given here can be used for parameter identification and design of nanoscale cantilevers that can be used as energy harvesters, sensors, and actuators.

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