A new approximate method for calculating the electromechanical coupling factors (kp and k31) related to transverse vibration in piezoelectric ceramics is proposed, which is applicable to a wide range of coupling factors with a considerable mechanical loss. The induced-piezoelectric resonance was measured by the transmission method on PMN-based electrostrictive resonators under an applied bias field. The electromechanical parameters were determined by using the new approximation in the temperature range -100°C to 100°C under fields up to 12×105 V/m. The electrostrictive Q31 coefficient obtained is -5.5×10−3 m4C−2 for PMN, which is in good agreement with that determined by other methods.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)