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 BiFeO 3 ‐BaTiO 3 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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Lee et al. (2024) studied this question.
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