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Proceedings Paper

New materials for large-strain actuator applications
Author(s): Kurt M. Rittenmyer; Robert Y. Ting
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Paper Abstract

Several new materials capable of generating large strains under an electric field are being developed for applications as actuators and high-drive sonar projectors. These materials are capable of generating strains that are several times large than those produced by conventional lead zirconate-titanate ceramics. The first group of materials are the class of lead magnesium niobate-lead titanate (PMNPT) ceramics. These materials are electrostrictive and, therefore, are operated under dc bias fields. The largest strains are obtained when the temperature is maintained in the region of the order-disorder phase transition of the material. This, however, makes the properties of the material temperature dependent. An alternative material is the family of lanthanum-modified lead zirconate-titanate (PLZT) ceramics. These materials have been developed extensively for electro-optic applications. They can generate even higher levels of strain compared with the PMNPT ceramics with less temperature dependence. They, however, suffer from higher dielectric hysteresis and are more suitable for actuator applications because of dielectric heating. Results are presented for measurements on several compositions of PMNPT and PLZT.

Paper Details

Date Published: 1 May 1994
PDF: 12 pages
Proc. SPIE 2189, Smart Structures and Materials 1994: Smart Materials, (1 May 1994); doi: 10.1117/12.174046
Show Author Affiliations
Kurt M. Rittenmyer, Naval Research Lab. (United States)
Robert Y. Ting, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 2189:
Smart Structures and Materials 1994: Smart Materials
Vijay K. Varadan, Editor(s)

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