S. Sherrit et al., DETERMINATION OF THE PIEZOELECTRIC ELECTROMECHANICAL COUPLING-CONSTANT K(13) USING A FREQUENCY RATIO METHOD, Ferroelectrics, 193(1-4), 1997, pp. 89-94
An alternative method to determine the electromechanical coupling cons
tant k(13) for the length-thickness piezoelectric resonator is present
ed. Data relating the electromechanical coupling constant k(13) to the
parallel resonance frequency ratios are tabulated. A third order poly
nomial was found to represent the relationship accurately for k(13) =
0.01 to 0.6. The coefficients of the polynomial and typical errors in
the fit are reported.