Thermal sensitivity of elastic coefficients of langasite and langatate.
Thermal coefficients of elastic constants of langasite and langatate crystals have been determined from frequency-temperature curves of contoured resonators operating in thickness modes. The effect of the trapping of the vibration has been taken into account to improve the accuracy. In a first step, the thermal sensitivities of stiffness coefficients in Lagrangian description are obtained. Thermal sensitivities of the usual elastic constants are further deduced. Predictions of thermally compensated cuts are given.
Bourquin
Roger
R
Freq. & Time Dept., Ecole Nat. Super. de Mec. et des Microtech., Besancon, France. rbourquin@ens2m.fr
Dulmet
Bernard
B