Phy.org - Science: Technology: Acoustics, Ultrasound and Vibration: Ultrasound: Research Groups and Centers: Piezoelectric Ceramics Research: Piezomaterials

Introduction to Piezo Transducers - Provided by Piezo Systems, Inc.
Piezoelectricity - Article from Wikipedia about the ability of some materials to generate an electric potential in response to applied mechanical stress.
Recommended Reading about Piezoelectricity - Provided by Piezo Systems, Inc.
Smart Material, Corp. (Germany) - Advanced piezoelectric Materials and Components
Theory and Applications of Piezo Ceramic Actuators and PZT NanoPositioning Systems - Physikinstrumente (Germany) - very good information about piezo actuators and positioning systems.

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