Resource for Piezoelectric Single Crystals
Abstract
This report documents work performed over the period of 01 April 1998 through 30 March, 1999 under the Office of Naval Research Contract N00014-98-1-0527. The program titled "Resource for Piezoelectric Single Crystals" combines a critical number of interdisciplinary faculty to address the areas of innovative crystal growth, novel piezoelectric materials, crystallographic and domain engineering, while investigating new application opportunities in the area of MEMs and electrooptics. Accomplishments in the above areas include the following: Crystal growth of Pb(Zn(1/3)Nb(2/3))O3-PbTiO3 (PZN-PT) and Pb(Mg(1/3)Nb(2/3))O3-PbTiO3 (PMN-PT) relaxor-based ferroelectrics continues to utilize high temperature flux growth to synthesize high quality crystals with less than 1 mole% variance of PbTiO3 across 1-2 inch size crystals. Alternatively, the Bridgman growth technique has been implemented for growth of nearly congruently melting PMN-PT materials. The underlying phenomena of crystallographic and domain engineering of high piezoelectric activity in Relaxor-PT crystals was applied to non-PbO perovskites, including BaTiO3 and Zr-modified BaTiO3 crystals, the latter grown by solid state techniques. Crystallographic engineering of non-PbO systems resulted in piezoelectric d(33) coefficients ranging from 350-600 pC/N and electromechanical coupling coefficients k(33) approx. 75-85%, comparable to superior of present day polycrystalline PZT ceramics. Novel compositions being investigated in this program include (Pb(Yb(1/2)Nb(1/2))O3-PbTiO3 Na, BiTiO3-BaTiO3 and Bi(A)O3-PbTiO3 (A Sc, Fe) systems, for the ultimate realization of high Tc piezoelectrics with enhanced acoustic power. Domain investigations under various E-field conditions have revealed that polarization fatigue may be crystallographic dependent with no fatigue for 001 oriented crystals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1999
- Accession Number
- ADA363144
Entities
People
- Thomas R. Shrout
Organizations
- Pennsylvania State University