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FERROELECTRIC, DIELECTRIC AND PIEZOELECTRIC PROPERTIES OF FERROELECTRIC THIN FILMS AND CERAMICSReports on Progress in Physics, 61
- Publisher
- Wiley
- Copyright
- Copyright © 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
- ISSN
- 1616-301X
- eISSN
- 1616-3028
- DOI
- 10.1002/adfm.201000284
- Publisher site
- See Article on Publisher Site
Abstract
Aging and re‐poling induced enhancement of piezoelectricity are found in (K,Na)NbO3 (KNN)‐based lead‐free piezoelectric ceramics. For a compositionally optimized Li‐doped composition, its piezoelectric coefficient d33 can be increased up to 324 pC N−1 even from a considerably high value (190 pC N−1) by means of a re‐poling treatment after room‐temperature aging. Such a high d33 value is only reachable in KNN ceramics with complicated modifications using Ta and Sb dopants. High‐angle X‐ray diffraction analysis reveals apparent changes in the crystallographic orientations related to a 90° domain switching before and after the aging and re‐poling process. A possible mechanism considering both defect migration and rotation of spontaneous polarization explains the experimental results. The present study provides a general approach towards piezoelectric response enhancement in KNN‐based piezoelectric ceramics.
Journal
Advanced Functional Materials – Wiley
Published: Jun 23, 2010