Accession Number:

ADA257354

Title:

Relaxor Ferroelectrics for Electrostrictive Transducers

Descriptive Note:

Final rept. 30 Sept 1990-30 Sept 1992

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Personal Author(s):

Report Date:

1992-09-30

Pagination or Media Count:

223.0

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 PbB1B2O3 strictors offer overall superior performance and warrant further investigation in prototype form.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE