Article · Wikipedia archive · Last revised Jul 5, 2026

Electromechanical coupling coefficient

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

Last revised
Jul 5, 2026
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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:

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