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Piezoelectricity

Piezoelectricity. GLY 4200 – Lecture 3 –Fall, 2014. Pierre and Jacques Curie. Pierre and Jacques Curie discovered piezoelectricity in 1881. Piezoelectric Effect Diagram. Illustration of Piezoelectric Effect. Generation of current by compression. Lighting a Neon Bulb.

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Piezoelectricity

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  1. Piezoelectricity GLY 4200 – Lecture 3 –Fall, 2014

  2. Pierre and Jacques Curie • Pierre and Jacques Curie discovered piezoelectricity in 1881

  3. Piezoelectric Effect Diagram

  4. Illustration of Piezoelectric Effect • Generation of current by compression

  5. Lighting a Neon Bulb • Demonstration of piezoelectricity

  6. Ion Generation • Cellophane is wrapped around nylon strings and pulled down • The strings repel each other • A gun, containing a piezoelectric crystal, is aimed at the string • Pulling the trigger causes the gun to emit positive ions • Negative ions are emitted when the trigger is released • When the trigger is released, the strings relax

  7. Polarization • Pi = dijkσjk • where • Pi is the polarization vector, • dijk is the piezoelectric modulus, and • σjk is the stress tensor

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