Results 261 to 270 of about 23,229 (304)

Determination of the d14 piezoelectric coefficient of tellurium

Ultrasonics, 1969
Abstract The piezoelectric coefficient d14 of Tellurium has been measured using longitudinal electromechanical resonance of rod-like samples. The applied electric field lies along a binary axis and the rod is perpendicular to this axis. We obtain: |d14| = (1.3 ± 0.15) 10-11C.N.-1.
J.P. Hermann, G. Quentin, J.M. Thuillier
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Invariant Piezoelectric Coefficients for Crystals

physica status solidi (b), 1970
AbstractIn writing out tensors which represent physical properties of crystals, it is customary to choose a Cartesian frame of reference which has a specific orientation with respect to the crystallographic axes. A new formulation is proposed in which the physical properties (in particular the piezoelectric property) of crystals can be specified ...
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Piezoelectric coefficients measured by picosecond ultrasonics

2009 IEEE International Ultrasonics Symposium, 2009
The needs for materials in thin films characterization are increasing with the raising interest for Micro-Electro-Mechanical-Systems. Picosecond ultrasonics (PU), a non-contact and non-destructive technique, has been largely developed to answer the mechanical metrology requirements of thin films technology, particularly in the field of Bulk Acoustic ...
Emery, P., Devos, Arnaud, Ben Hassine, N., Defay, E.   +3 more
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Microgeometry of Composites and Their Piezoelectric Coefficients $$\varvec{g_{ij}^{*} }$$

2018
Piezoelectric coefficients gij represent a link between an external mechanical stress applied to a sample and an electric field formed by polarisation charges of the sample as a result of the direct piezoelectric effect. The piezoelectric coefficients gij also characterise a link between a strain and electric displacement at the converse piezoelectric ...
Topolov V. Y., Bowen C. R., Bisegna P.
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Piezoelectric Coefficients of PZT Thin Films

Integrated Ferroelectrics, 2002
Longitudinal piezoelectric coefficient (d 33 ) and transverse piezoelectric coefficient (e 31 ) of sol-gel derived lead zirconate titanate (PZT) thin films have been measured. d 33 was measured based on the converse piezoelectric effect using a single beam laser interferometer. Bending of the substrate caused by surface displacement of the PZT film was
R. C. W. Tsang, K. W. Kwok, H. L. W. Chan, C. L. Choy   +3 more
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Inequality of direct and converse piezoelectric coefficients

Ferroelectrics, 1981
Abstract It is demonstrated theoretically and experimentally that the direct and converse piezoelectric coefficients. ∂P/∂σ and ∂e/∂E, are not equal as is generally believed. The correct relationship between these coefficients is derived, and it is shown that the experimentally measured quantities analogous to the piezoelectric coefficients are equal ...
R. A. Anderson, R. G. Kepler
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Laminates with Given Piezoelectric Expansion Coefficients

Mechanics of Advanced Materials and Structures, 2006
This paper concerns laminates made of composite plies with piezoelectric actuators. The subject of the paper is the research of laminates having, in some directions, null expansion coefficients in extension or having the same expansion coefficient in each direction (isotropic behavior). The general equations for the problem are given in the theoretical
P. Vannucci, J. Pouget
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A novel piezoelectric ceramic with high Curie temperature and high piezoelectric coefficient

Ceramics International, 2020
Abstract 0.02Pb(Sb1/2Nb1/2)O3-0.98Pb1-xBax(Zr0.53Ti0.47)O3 (PSN-PBxZT) ceramics with high Curie temperature and high piezoelectric properties were prepared by traditional solid state reaction measurement to meet the requirements for high temperature applications, and the crystal structure, dielectric, piezoelectric and ferroelectric properties were ...
Siyu Huang, Jiangtao Zeng, Liaoying Zheng, Zhenyong Man, Xuezheng Ruan, Xue Shi, Guorong Li   +6 more
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Direct measurement of piezoelectric shear coefficient

Journal of Applied Physics, 2013
Piezoelectric materials exhibit electromechanical coupling which has led to their widespread application for sensors, actuators, and energy harvesters. These materials possess anisotropic behavior with the shear coefficient, and have the largest electromechanical coupling coefficient.
Mohammad H. Malakooti, Henry A. Sodano
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Effectiveness coefficient measures for piezoelectric sensors

Sensors and Actuators A: Physical, 1996
Abstract Two piezoelectric sensor effectiveness coefficients that provide a quantitative measure of effectiveness for piezoelectric materials which are being used for sensing strain (voltage sensor) or strain rate (current sensor) are introduced.
B.R. Patnaik, G.R. Heppler, W.J. Wilson
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