Relaxor Ferroelectrics for Electrostrictive Transducers: Electrostrictive Strain/Dielectric Properties of Relaxor Ferroelectrics.

摘要

The electrostrictive actuator and nonresonant transducer capabilities of relaxor ferroelectrics have been of practical interest for the last decade. Displacement transducers from materials which have large elecrostrictive effects are advantageous for several reasons: (1) The field-induced deformations (strains) are more stable than in piezoelectric ceramics (relaxation processes are minor and they do not evidence aging from macrodomain-defect interactions), (2) Hysteresis in the strain-field dependence is reduced over a wide temperature range. The original dimension is returned to rapidly after removal of the polarizing field (reduced creep and strain offset), and (3) Thermal expansion effects are quite small in the relevant temperature range of maximum dielectric permittivity.