Stress Engineered Piezoelectric Composites
Stress-biased piezoelectric composites represent a family of piezoelectric ceramic-based actuators and transducers that offer a variety of performance advantages compared to more traditional unimorph devices. In this chapter, the history, fabrication, performance attributes and potential applications for these devices are discussed. The devices are typically fabricated using piezoelectric and elastic layers at temperatures between 150 and 300°C. The different coefficients of thermal expansion of the layers typically result in doming of the composite during cooling and the development of an in-situ stress-profile across the piezoelectric layer. These characteristics increase the robustness of the composite devices and may enhance domain wall motion contributions to piezoelectric response, yielding high electromechanical deformation. To date, a variety of composite devices based on different layers, processing strategies, and design philosophies have been developed to take advantage of these characteristics. Potential applications for the devices are also discussed, as are the underlying aspects of the devices that contribute to their performance.
M. Narayanan et al., "Stress Engineered Piezoelectric Composites," Piezoelectric Materials: Structure, Properties and Applications, pp. 37-77, Nova Science Publishers, Inc., Jan 2010.
Materials Science and Engineering
Keywords and Phrases
Piezoelectricity; Piezoelectric materials; Graded piezoelectric
International Standard Book Number (ISBN)
Book - Chapter
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