Ferroelectric Polarization Dependent Piezoelectric Hardening in BiFeO3-BaTiO3 Lead-Free Ceramics

초록

The relation between the improvement of mechanical quality factor (Q(m)) and internal electric field (E-i) generated during the aging process in lead-free piezoelectric BiFeO3-BaTiO3 ceramics is investigated for hard piezoelectric application of power transducers. The change of built-in E-i depends on the ferroelectric polarization (P) direction during the aging process. For the aging process with P parallel to E-i, Q(m) and E-i increases but Q(m) and E-i decreases with P antiparallel to E-i. These results are attributed to the migration of defects by depolarization fields and domain-wall pinning. This work provides the systematic guidance to develop high-power piezoelectric transducers with lead-free ceramics.

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