Results 251 to 260 of about 82,178 (282)

Characterization of piezoelectric materials with large piezoelectric and electromechanical coupling coefficients

Ultrasonics, 2003
The relaxor based ferroelectric (1-x)Pb(Zn(1/3)Nb(2/3))O(3)-xPbTiO(3) and (1-x)Pb(Mg(1/3)Nb(2/3))O(3)-xPbTiO(3) single crystals provided new challenges in property characterization because their extraordinarily large piezoelectric coefficients and electromechanical coupling coefficients.
Wenhua, Jiang, Rui, Zhang, Bei, Jiang, Wenwu, Cao   +3 more
openaire   +2 more sources

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
openaire   +2 more sources

3D printed ferroelectret with giant piezoelectric coefficient

Applied Physics Letters, 2022
A ferroelectret cellular structure of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] is fabricated by a 3D printing technique that exhibits a giant piezoelectric coefficient of 1200 pC/N, which is 40 times higher than its commonly known film counterpart.
Ajay Kumar, Dalip Saini, Dipankar Mandal
openaire   +1 more source

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
openaire   +1 more source

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 ...
openaire   +1 more source

Sheet geometry enhanced giant piezoelectric coefficients

Applied Physics Letters, 2006
The authors report a giant piezoelectric coefficient, −d31=2000pm∕V in substrate-free polycrystalline (Pb(Mg1∕3Nb2∕3)O3)0.63(PbTiO3)0.37 (PMN-37PT) sheets at E⩾7kV∕cm, larger than the −d31=930pm∕V exhibited by specially cut commercial PMN-PT single crystals and 300–500pm∕V of polycrystalline bulk PMN-37PT.
Wan Y. Shih, Hongyu Luo, Huidong Li, Christian Martorano, Wei-Heng Shih   +4 more
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Sensor effectiveness coefficients for piezoelectric materials

Proceedings of 1995 American Control Conference - ACC'95, 2005
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. The use of these coefficients for selecting sensor materials is illustrated through a numerical example.
B.R. Patnaik, G.R. Heppler, W.J. Wilson
openaire   +1 more source