Basic Studies on Templated Grain Growth of Relaxor Ferroelectric Crystals and Textured Ceramics
Abstract
Templated grain growth (TGG) enables the relatively low cost fabrication of textured ceramics with single crystal-like properties, as well as single crystals. The resulting ceramics show texture levels up to 90%, and significant enhancements in the piezoelectric properties relative to randomly oriented ceramics with comparable densities. The piezoelectric coefficients of highly textured PMN-32.5PT ceramics were found to be ^1.2- 1.5 times greater than randomly-oriented samples. The unipolar strain-field measurements (<S kV/cm) of 90%-textured PMN-32.5PT ceramics produced piezoelectric coefficients as high as 1150 pC/N with relatively low piezoelectric hysteresis. Electrical and electromechanical property characterization of<001>pc textured sodium bismuth titanate - 5.5 mol% barium titanate rhombohedral ceramics showed 0.26% strain at 70 kV/cm, and large field piezoelectric coefficients over 500 pC/N were obtained for highly textured samples (f^90%). Reasons are given for why the high field dielectric and electromechanical properties are more hysteretic than those of single crystals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 2003
- Accession Number
- ADA420282
Entities
People
- Gary L. Messing
- Susan Trolier-McKinstry
Organizations
- Pennsylvania State University