Poling direction driven large enhancement in piezoelectric performance

摘要

This study proposes enhancement in piezoelectric performance by tuning the poling direction in polycrystalline ceramics. Theoretically, it has been proven that transverse piezoelectric strain coefficient (d(31)) and (d(31)(eff)/epsilon(eff)(33)) governing factors for actuation and sensing respectively, get modified by altering poling direction. Finally, different polycrystalline materials have been employed to explore the effect of poling orientation on sensing and actuation capabilities. Optimised orientations were calculated for case of sensing and actuation. Among all materials under study, maximum increment in d(31)(eff) and (d(31)(eff)/epsilon(eff)(33)) was observed for 0.3BaTiO(3) - 0.7NaNbO(3) (BT-Nb). d(31)(eff) and (d(31)(eff)/epsilon(eff)(33)) were as high as -356 pm/V and -0.152 pm/V respectively for BT-Nb at optimised orientation. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.