Targeted Basic Studies of Ferroelectric and Ferroelastic Materials for Piezoelectric Transducer Applications.
Rept. for 1 Jan-31 Dec 78,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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This report documents work initiated during the first nine months of a major new five-year program which is focused on some of the fundamental problems in ferroelectric and ferroelastic crystals which are of special relevance to the design and development of new and improved materials for electromechanical transducers. Electrostriction is the basic coupling mechanism between dielectric and mechanical properties in all present ceramic piezoelectric transducers, yet there is no adequate theoretical description of this phenomenon, and reliable experimental values are not available for the electrostriction constants of many simple insulators. For experimental measurement of electrostrictive deformations an ultrasensitive AC dilatometer is being developed. The present instrument will resolve displacements of 0.005A at 7.5 Hz, and is presently being used to measure electrostriction constants for a range of alkali halide crystals.
- Electricity and Magnetism