Temperature and field stable relaxor-PT piezoelectric single crystals

摘要

The application is directed to piezoelectric single crystals having shear piezoelectric coefficients with enhanced temperature and/or electric field stability. These piezoelectric single crystal may be used, among other things, for vibration sensors as well as low frequency, compact sonar transducers with improved and/or enhanced performance.

主权项

1. A piezoelectric single crystal having a composition with the formula PMN-xPT or yPIN-(1-y-z)PMN-zPT, where 0.20≦x≦0.305, 0.26≦y≦0.50, 0.20≦z≦0.31;
wherein the crystal is poled along the crystallographic [110] direction and having a rhombohedral phase, a ‘2R’ engineered domain configuration and macroscopic mm2 symmetry; and wherein the crystal has electrodes on the (−110) faces, with a k15 of about 90%, a shear piezoelectric coefficient d15 of about 2000 pC/N, and has a coercive field of about 5 kV/cm with an internal bias field of about 1 kV/cm, the allowable AC field drive level being about 40% of the coercive field.