NDLI: Theoretical study of the influence of the electromechanical constants and nonlinear mechanical losses of various piezoelectric materials on their performances in power transducers

Content Provider	IEEE Xplore Digital Library
Author	Gonnard, P. Mai Pham Thi
Copyright Year	2005
Description	Author affiliation: Lab. de Genie Electrique et Ferroelectricite, Inst. Nat. des Sci. Appliquees, Villeurbanne, France (Gonnard, P.)
Abstract	A simple analytical model is developed in longitudinal resonance mode taking into account the piezoelectric and mechanical constants of the materials as well as a mechanical loss tangent depending on the relative mean strain S : tan/spl delta//sub m/ = tan/spl delta//sub mo/ + /spl alpha/S/sup 2/, where tan/spl delta//sub mo/ is the low power mechanical loss tangent and /spl alpha/ a coefficient characteristic of the non-linearity. For a given acoustical load, the power supplied to the load, the mechanical losses and the maximum internal stress are expressed as a function of the applied electric field at the series resonance frequency for various materials: hard PZT, hard BaTiO/sub 3/ and PMN-PT ceramics and a PMN-PT single crystal. In steady state, the limitation factor would be the loss power for PMN-PT ceramic and single crystal and the maximum stress for hard PZT and BaTiO/sub 3/. In longitudinal mode , the very high compliance s/sub 33//sup E/ of the single crystal goes against it, however, its low acoustical impedance significantly reduces the internal stresses. The hard lead-free BaTiO/sub 3/ could be similar in radiated power to the hard PZT but it should be fed with higher electric fields. The respective influences of tan/spl delta//sub mo/ and /spl alpha/ on the performances are discussed. Finally, some single crystals and textured ceramics seem promising for 31 transducers.
Starting Page	51
Ending Page	55
File Size	751596
Page Count	5
File Format	PDF
ISBN	0780384105
ISSN	10994734
DOI	10.1109/ISAF.2004.1418335
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-08-23
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Piezoelectric materials Piezoelectric transducers Ceramics Resonance Internal stresses Analytical models Capacitive sensors Power supplies Resonant frequency Crystalline materials
Content Type	Text
Resource Type	Article

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