The piezoelectric coefficient or piezoelectric modulus, usually written d33, quantifies the volume change when a piezoelectric material is subject to an electric field, or the polarization on the application of stress. In general, piezoelectricity is described by a tensor of coefficients [math]\displaystyle{ d_{ij} }[/math]; see Piezoelectricity ยง Mechanism for further details.
Original source: https://en.wikipedia.org/wiki/Piezoelectric coefficient.
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