U.S.-Japan Research Collaboration on Hard Driving Ceramic Actuators
Final rept. 1 Jul 96-31 Jan 98
PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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High field properties of electro-active ceramics are an important issue to understand in order to apply these ceramics in actuator applications. This project was developed to establish research collaborations with Japanese piezoelectric ceramic researchers in order to fully characterize these ceramics. Due to a PI change during the contract, the collaboration was not completed as originally planned. The information exchange was summarized as a trip report. However, at Penn State University, three very different family of active ceramics electrostrictor, phase switching ceramics and various compositions of conventional PZT were prepared and tested under high field and various pre-load and temperature conditions. The electrostrictive PMN-PT showed little stress dependence where as the AFE-FE phase switching composition showed intriguing stress dependence which introduced a new idea of incorporating additional phase transformation steps. The tetragonal structure of conventional PZTs showed less stress dependence than the morphotropic phase boundary MPB and rhombohedral compositions. Stress depoling can be reduced by maintaining a DC bias. These results showed correlations between intrinsic material behavior and external stresses, both electrical and mechanical.
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass