Electrical properties of lead-free 0.98(Na0.5K0.5Li0.1)NbO3-0.02Ba(Zr0.52Ti0.48)O3 ceramics by sintering temperature
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Atmospheric temperature range
Orthorhombic crystal system
Electromechanical coupling coefficient
Temperature coefficient
Coupled vibration of piezoelectric ceramic circular vibrators as the piezoelectric effect considered
The coupled vibration of piezoelectric ceramic disks was studied when the piezoelectric effect is considered. Based on the piezoelectric and motion equations, introducing themechanical coupling coefficient the electric admittance and the frequency equation werederived, the relation between the axial and radial vibrations was analyzed. The resonantfrequencies of the vibrators were computed' Compared with the measured frequencies thecomputed results of this paper are better those computed by one dimensional theory.
Admittance
Electromechanical coupling coefficient
Piezoelectric accelerometer
Piezoelectric motor
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Electromechanical coupling coefficient
Converse
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This paper analyzes that the affection of multi-piezoelectric effect on performances of piezoelectric sensor including elastic constants, Poisson ratio, piezoelectric coefficient and energy conversion so on. The secondary converse piezoelectric effect by the beginning of the first positive piezoelectric effect decreases the deformation of piezoelectric sensor, elastic constants, energy of force-electric conversion and change Poisson ratio at the same time; the third positive piezoelectric effect decreases piezoelectric coefficient of piezoelectric sensor. This investigation of multi-piezoelectric effect on performances of piezoelectric sensor will provide the new method to improve sensitivity, force-electric conversion ratio and convertible precision.
Piezoelectric accelerometer
Poisson's ratio
Piezoelectric motor
Electromechanical coupling coefficient
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Piezoelectric constant and Curie temperature are two important parameters of piezoelectric materials, but currently most piezoelectric materials have the problem of obtaining both high piezoelectric coefficient and Curie temperature. In this work, quaternary piezoelectric ceramics of 0.28Pb(In1/2Nb1/2)O3-0.32Pb(Zn1/3Nb2/3)O3–(0.4-x)PbTiO3-xPbZrO3 (x = 0~0.25) were designed and prepared by a solid-phase method, and the phase structure, dielectric, piezoelectric and ferroelectric properties of 0.28PIN-0.32PZN-(0.4-x)PT-xPZ piezoelectric ceramics were investigated by regulating the Zr/Ti ratio. The results show that the selected compositions are located in the MPB region, and the ceramic samples of each component display high density, the piezoelectric constant (d33) and the electromechanical coupling coefficient (kp) increase and then decrease with the increase of x. The optimum piezoelectric properties are found in compositions at x = 0.1, which showed a high piezoelectric coefficient d33 of 450 pC/N and high Curie temperature Tc of 272 °C. It is promising for use in high-temperature piezoelectric transducers.
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The piezoelectric properties of the PZT-5H ceramics under various polarization conditions are compared and analyzed. It is worth noting that compared to direct current polarization, the piezoelectric coefficient (d33), free dielectric constant (ε33T/ε0), and electromechanical coupling coefficient (kt) of the PZT-5H ceramics under alternating current polarization (ACP) have increased by 10.7%, 15.9%, and 15.4%, respectively. According to the analysis of the domain distribution patterns in the [001] surface of the PZT-5H ceramics under the two polarization conditions measured using a piezoresponse force microscope, the ACP makes the piezoelectric material have a high density of the domain wall, which greatly enhances its piezoelectric performance. This work provides an effective means to improve the piezoelectric properties of PZT-5H ceramics and will be of great significance to piezoelectric applications using this type of piezoelectric ceramic.
Electromechanical coupling coefficient
Piezoresponse force microscopy
Piezoelectric accelerometer
Nanogenerator
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Electromechanical coupling coefficient
Lamb waves
Piezoelectric accelerometer
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In this paper, theoretical analysis is performed on the influence of multiple piezoelectric effects on piezoelectric coefficients. And a kind of classical piezoelectric ceramics was adopted to conduct the experimental validation. The experimental results of short-circuit boundary condition are obtained by the methods that a capacitor whose capacitance is much larger than that of the stack is parallel with PZT-5. Influence results are obtained through comparing them with open-circuit piezoelectric coefficient. Experimental result shows that multiple piezoelectric effects make piezoelectric coefficient of PZT-5 be altered by 18%.
Electromechanical coupling coefficient
Piezoelectric accelerometer
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Electromechanical coupling coefficient
Alternating current
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Electromechanical coupling coefficient
Acoustic impedance
Piezoelectric accelerometer
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The development of relaxor single crystal piezoelectric materials with exceptionally high electromechanical coupling (k above 0.85) and high elastic and piezoelectric anisotropy presents challenges and questions to the applicability of the use of traditional resonant bar methods (IEEE Standard on Piezoelectricity, 176-1987, Sec. 6.4) for determining the constituent piezoelectric properties. Standard bar techniques for determining coupling coefficient rely on the single degree of freedom electromechanical circuit models for sufficiently long samples whereby measurements of isolated resonances and antiresonance frequencies are uncorrupted by lateral resonances. The limited applicability of the standard method for these piezoelectrics has motivated the development of an alternative method that avoids many of the previous short comings. A lumped parameter dumb-bell resonator approach was implemented by employing a small single crystal piezoelectric sample sandwiched between reactive terminations whereby the piezoelectric and elastic properties may be determined. Coupling coefficients k-33 and k-31 as high as 0.88 were measured for single crystal CPSC160-95 and CPSC180-120 by Ceracomp.
Antiresonance
Electromechanical coupling coefficient
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