Low Voltage Electrostriction and Piezoelectric Ceramic Transducers
Final rept. 1 Jun 77-31 Oct 78,
PENNSYLVANIA STATE UNIV STATE COLLEGE MATERIALS RESEARCH LAB
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The objective of this program was to demonstrate the feasibility of using established multilayer ceramic technology from the capacitor industry to develop internally electroded electrostrictive displacement transducers which could be operated at low terminal voltages. It has been shown that for units fabricated from a BaTiO3 based proprietary dielectric formulation Erie K 5,500 the conventional tape casting methods can be extended to produce units with up to 100 internally electroded dielectric layers, provided suitable care is taken with the thermal processing. Electrostriction measurements on units with 10, 50, and 100 layers have shown no detectable degradation of the electrostrictive effect with increasing numbers of electrode layers, and this is also supported by evidence from single and multilayers in cyclindrical configuration. Thus it is established that the internal electrode arrangement can be used to enhance the electric field at lower voltages without deleterious consequence. A new family of relaxor ferroelectrics based on PbMg13Nb23O3 has been explored and dielectrics in the PbMg13Nb23O3PbTiO3 system shown to have low frequency electrostriction properties superior to those of the BaTiO3 based capacitor compositions. Advantages of the relaxors include lower hysteresis, higher stability, improved sensitivity and exceedingly low thermal expansion.
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods