Targeted Basic Studies of Ferroelectric and Ferroelastic Materials for Piezoelectric Transducer Applications.
Abstract
This program on Targeted Basic Studies of Ferroelectric and Ferroelastic Crystals for Piezoelectric Transducer Applications is now in the fourth year of operation. Achievement over the past year have included: (1) The development of a correct phenomenology for electrostriction which leads to a Gibbs function which is invariant under simple body rotation. (2) Refinement of the full microscopic theory including temperature dependence of electrostriction in the important perovskite structure oxides. (3) Development of new processing methods for PbMg(7/3)Nb(2/3)O3 based relaxor ferroelectric compositions which eliminate the troublesome unwanted pyrochlore phase. (4) The design of new 1:3 and 2:3 connected PZT: polymer composites which have very high dhgh product and freedom from pressure dependence up to 1,000 psi pressure. (5) Crystal pulling of (Pb(1-x)Ba(x)Nb206 crystals at compositions close to the important morphotropic boundary. (6) A clear demonstration of the importance of piezoelectric grain resonance as the source of dielectric dispersion in LiNb03 ceramics. (7) The development of an important new family of polar glass ceramics which are polar but non-ferroelectric and are poled by growth in a strong temperature gradient. Materials which combine high transverse coupling and low temperature coefficient of resonant frequency have been fabricated by this method.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1981
- Accession Number
- ADA114497
Entities
People
- G. R. Barsch
- J. V. Biggers
- Leslie Eric Cross
- Robert E. Newnham
Organizations
- Pennsylvania State University