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Novel High Power Piezoelectrics for Transformers and Actuators

Published online by Cambridge University Press:  01 February 2011

Shashank Priya  and
Kenji Uchino
Shashank Priya
Affiliation:
International Center for Actuators and Transducers, Materials Research Institute, Pennsylvania State University, University Park, PA 16802.
Kenji Uchino
Affiliation:
International Center for Actuators and Transducers, Materials Research Institute, Pennsylvania State University, University Park, PA 16802.
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Abstract

This letter reports a Pb(Zr0.5Ti0.5)O3 (PZT) based composition, which provides high dielectric, piezoelectric and electromechanical properties. The composition corresponding to 0.2 PZN – 0.8 PZT + 0.5 wt% MnO2 provides the radial mode coupling factor (kp) of 0.58, longitudinal mode piezoelectric constant (d33) of 277 pC/N, dielectric constant (ε33/εo) of 946 and mechanical quality factor (Qm) of 1402. X-ray diffraction, dielectric and polarization-electric field measurements were done to investigate the origin for this high performance. It was found that high soft properties are obtained due to the shifting of PZT composition towards morphotropic phase boundary (MPB) and high hard properties are obtained due to the generation of dipolar defects which pin the polarization. The properties of the composition corresponding to 0.9 PZT – 0.1PMnN (Zr/Ti = 0.51/0.49) modified with 6 mol% Sr were found to be: kp = 0.53, Qm = 800, d33 = 274, ε33/εo = 1290 and tanδ = 1.1 %, with a TCF of -8 ppm/oC (-20 to 80°C). High piezoelectric properties with low TCF shows the suitability of this composition for ultrasonic devices used under fluctuating thermal environment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D1.6
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

1. Priya, S., PhD dissertation, Pennsylvania State University, University Park, PA (2003).Google Scholar
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