Electromechanical coupling coefficient

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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:

[math]\displaystyle{ k^{-2} = \frac{1}{\mbox{ energy converted per input energy}} }[/math]

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Licensed under CC BY-SA 3.0 | Source: https://handwiki.org/wiki/Physics:Electromechanical_coupling_coefficient
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