The Development of High Power Materials with Enhanced Vibrational Velocity and Related Origin Investigation
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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Improved piezoelectric materials with higher vibrational velocities are needed to meet demands of advanced high power electromechanical applications. This paper has reviewed and discussed recent high power materials development, related loss mechanism analysis and possible high power origin investigation. Yb doped PbZr,TiO3-PbSb,MnO3 has been identified as a novel materials with a significantly enhanced vibration velocity, as compared to the commercial hard piezoelectric. Systematic investigations revealed that internal dipolar fields and applied positive DC biases have the same effect. Both stabilize preferred domain structures, lowering the loss factors. Under high drive conditions, internal dipolar field Esub int should play an important role in increasing mechanical quality factor Qsub m, allowing for the obtainment of higher vibrational velocities within specific thermal stability operational criteria, since heat generation under high field is mainly attributed from extensive dielectric loss, which significantly increases with increasing electric field. Enhanced domain stability by Esub int may be most important in this regard of lowering the loss factors and raising Qsub m. Development of materials with enhanced Qsub m values and high energy densities have been obtained by rare earth modifications of PbZr,TiO3-PbSb,MnO3 ceramics.
- Fabrication Metallurgy
- Electricity and Magnetism