Piezoelectric and Electrostrictive Materials for Transducer Applications. Volume 1
Abstract
Studies of the 3:0 type composite have evolved a new structure for a much more effective stress transforming composite. The device uses cavities in the electrode structure which are simple, inexpensive and robust. The sensitivity is higher than that of the end capped cylinder for equivalent PZT volume and we believe this will be a most important development for towed array hydrophones. For agile transducer structures, the very high piezoelectric coefficients induced by DC bias in the lead magnesium niobate:lead titanate electrostrictors have been confirmed using both resonance and ultra-dilatometer methods. In parallel studies of aging in these systems a rather complete understanding of the aging process has been obtained and methods for fabricating PMN:PT systems with no aging developed, an essential need for the agile transducer. The phenomenology of the PZT system has been completed and the equations are now being applied to studies of the properties of PZT compositions at the lead titanate end of the system. The phenomenology will be particularly valuable for the future evaluation of thin film PZTs where the breakdown field are such that EB.Ps is a large perturbation to the total energy. In high strain actuators for surface modification and flow control antiferroelectric:ferroelectric systems have been explored which yield strains up to 0.85%. Effort is now being dedicated to understanding and eliminating fatigue effects in these charge switching systems. A detailed modeling of the 1:3 type PZT:polymer composite has now been completed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1990
- Accession Number
- ADA223560
Entities
People
- A. S. Bhalla
- J. H. Adair
- J. P. Dougherty
- Leslie Eric Cross
- Robert E. Newnham
Organizations
- Pennsylvania State University