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9.2.1: Introduction to Piezoelectric Materials

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    The direct piezoelectric effect was originally discovered in 1880 by Jacques and Pierre Curie. They did not come into widespread use until the first world war, when quartz was used in SONAR. This was replaced in the second world war by Barium Titanate, and this has become one of the most important piezoelectric materials in the world. They are both now commonly used in many ways.

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