Piezoelectric coefficient or Piezoelectric Modulus, aka D33, quantifies the volume change when a piezoelectric material is subject to an electric field, or the polarization on application of a stress: \( {\displaystyle d={\dfrac {P}{\sigma }}} \) where P is polarization, and \( \sigma \) is the stress.
There are actually many Piezoelectric coefficients: Dxy.
See Piezoelectricity § Mechanism.
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