Relaxor-based ferroelectric single crystals for electromechanical actuators

Seung Eek Eagle Park; Venkata Vedula; Ming-Jen Pan; Wesley S. Hackenberger; Patrick Pertsch; Thomas R. Shrout

doi:10.1117/12.316856

20 July 1998 Relaxor-based ferroelectric single crystals for electromechanical actuators

Seung Eek Eagle Park, Venkata Vedula, Ming-Jen Pan, Wesley S. Hackenberger, Patrick Pertsch, Thomas R. Shrout

Proceedings Volume 3324, Smart Structures and Materials 1998: Smart Materials Technologies; (1998) https://doi.org/10.1117/12.316856
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

The piezoelectric properties of relaxor based ferroelectric single crystals, such as Pb(Zn_1/3Nb_2/3)O₃ - PbTiO₃ (PZN-PT) and Pb(Mg_1/3Nb_2/3)O₃ - PbTiO₃ (PMN- PT) were investigated for electromechanical actuators. In contrast to polycrystalline materials such as Pb(Zr,Ti)O₃ (PZT's), morphotropic phase boundary compositions were not essential for high piezoelectric strain. Piezoelectric coefficients (d₃₃'s) > 2500 pC/N and subsequent strain levels up to > 0.6% with minimal hysteresis were observed. Crystallographically, high strains are achieved for <001> oriented rhombohedral crystals, though <111> is the polar direction. Ultrahigh strain levels up to 1.7%, an order of magnitude larger than those available from conventional piezoelectric and electrostrictive ceramics could be achieved, being related to an E-field induced phase transformation. Strain vs. E-field behavior under external stress was also much superior to that of conventional piezoelectric ceramics. High electromechanical coupling (k₃₃) > 90% and low dielectric loss <1%, along with large strain make these crystals promising candidates for high performance solid state actuators.

Citation Download Citation

Seung Eek Eagle Park, Venkata Vedula, Ming-Jen Pan, Wesley S. Hackenberger, Patrick Pertsch, and Thomas R. Shrout "Relaxor-based ferroelectric single crystals for electromechanical actuators", Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); https://doi.org/10.1117/12.316856

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