Relaxor Ferroelectrics for Electrostrictive Transducers
Abstract
The higher order electro-mechanical coupling electrostriction was proposed as an alternative to the piezoelectric phenomena commonly employed for sonar-type transducers. In contrast to piezoelectric ceramics (e.g. PZTs) electrostrictors offer enhanced strain-energy density, without the detrimental effects such as aging, hysteresis, walk-off, associated with macro--domains. Although all insulating materials exhibit electric field induced strains, only those in which large polarizations can be induced are of present interest. As such, four types of electrostrictor-type families were proposed based upon their polarization change mechanisms. The performance of the four types of strictors have been summarized. For comparison, two types of PZTs--I, III or hard ferroelectrics, are also given. Based on the results from this work, it is clear that the Type I Pb(B1B2)O3 strictors offer overall superior performance and warrant further investigation in prototype form.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1992
- Accession Number
- ADA257354
Entities
Organizations
- Pennsylvania State University