Piezoelectric and Electrostrictive Materials for Transducer Applications.
Abstract
On the topic piezolelectric composites, work over the year has focused primarily upon materials with 0:3 phase connectivity. Using chemically co-precipitated powders with high purity and surface perfection, it has been possible to raise the poling field substantially and realize markedly improved properties in lead titanate based materials. X-ray measurements confirm excellent poling and the dhgh figure of merit of 4200x10 to the minus 15th power sq m2/N is comparable to the best NGK materials. Work on fired composites which use a low temperature pre-firing yield materials with high d33 and gh values which pole at low fields. New studies of piezoelectrics generated using using paint technology permit surprisingly high powder loading and show promising properties for large area receptors. Modelling studies of 'Safari' type 3:1 and 3:2 composites using finite element methods show excellent agreement with measured properties and provide new insights into complex stress distributions in Holey composites. To explore the possibility of patterning ceramics by semiconductor type techniques, ethches have been explored for PZT family materials and photo resist defined structures have been produced. In electrostriction, the basic theoretical work has continued upon CaF2, SrF2 and BaF2. Good agreement is found for calculations of third order elastic constants, and for hydrostatic electrostriction, but Q11 and Q12 show large discrepancies with both theoretical models tried. Experimental studies have now moved to glass systems and new measurements have been made on sodium trisilicate, sodium aluminosilicate and on borosilicate glasses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1986
- Accession Number
- ADA173185
Entities
People
- G. R. Barsch
- J. V. Biggers
- Leslie Eric Cross
- Robert E. Newnham
Organizations
- Pennsylvania State University