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The electromechanical coupling coefficient is a numerical measure of the conversion efficiency between electrical and acoustic energy in piezoelectric materials.

Qualitatively the electromechanical coupling coefficient, k, can be described as:

${\displaystyle k^{-2}={\frac {1}{\mbox{ energy converted per input energy}}}}$

References

• "Electromechanical coupling coefficient". Medcyclopaedia. GE. Archived from the original on 2012-02-04.
• Vilnius University, Laboratory of Physical Acoustics

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