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Piezoelectric Crystals

Piezoelectric Crystals. MEEN 3344 By: Matthew Kelso. Piezoelectric Crystals. Crystals that generate a voltage when a stress is applied to them. The inverse effect is also true: a voltage causes deformation. This is due to complicated crystal structure that is unsymmetrical about the center.

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Piezoelectric Crystals

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  1. Piezoelectric Crystals MEEN 3344 By: Matthew Kelso

  2. Piezoelectric Crystals • Crystals that generate a voltage when a stress is applied to them. • The inverse effect is also true: a voltage causes deformation. • This is due to complicated crystal structure that is unsymmetrical about the center.

  3. How It Works • In these crystals, the positive and negative charges are separated, but symmetrical. • When a stress is applied, the symmetry is disrupted and there is an uneven charge distribution. • This uneven distribution generates a voltage across the system.

  4. Types of Crystals • Quartz is the most commonly used crystal. • Natural Crystals: Quartz, Rochelle Salt, Topaz, Cane Sugar, Bone • Some ceramics • Polyvinylidene Fluoride (PVDF)

  5. Applications • Vibration Dampeners • Energy farm • Quartz Watches • Guitar Pickups • Lighters • Sonar • Phonographs • Printers

  6. References • http://www.piezo.com/tech4history.html • http://en.wikipedia.org/wiki/Piezoelectricity • http://openlearn.open.ac.uk/mod/resource/view.php?id=257278 • Callister, W.D., Fundamentals of Materials Science and Engineering: An Integrated Approach, 3rd ed. Wiley and Sons, 2008, Online • http://www.treehugger.com/files/2006/08/japan_ticket_gates.php • http://www.answers.com/topic/piezoelectricity • http://www.slashgear.com/gibson-powertune-the-guitar-that-tunes-itself-047793/ • http://gemscollection.blogspot.com/2007/08/topaz-gemstone.html • http://www.handsofhopedisasterreliefservices.org/b2b/confectionery_and_candy/1/ • http://flickr.com/photos/14833125@N02/2182032919 • http://www.mineralminers.com/images/phantom-quartz/polx/phqp271.jpg • http://www.filterforge.com/filters/4802.html • http://www.phonodoc.com/phono.htm • http://www.global-b2b-network.com/b2b/26/37/858/157887/piezo_igniters.html • http://en.wikipedia.org/wiki/Inkjet_printer • http://www.explainthatstuff.com/insidequartzwatch.jpg

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