Journal article


Enhanced extrinsic domain switching strain in core-shell structured BaTiO3-KNbO3 ceramics


Publication Details
Author(s): Khansur NH, Kawashima H, Wada S, Hudspeth JM, Daniels J
Publisher: Elsevier
Publication year: 2015
Volume: 98
Pages range: 182-189
ISSN: 1359-6454

Abstract

Large electric-field-induced strain in piezoelectric ceramics is a primary requirement for their actuator applications. This macroscopic strain is generated from both intrinsic lattice strain and extrinsic domain switching and/or phase transformations. Among these contributions, non-180 degrees ferroelectric domain switching can generate a large electric-field-induced strain due to the change in orientation of the coupled spontaneous strain. However, the large fraction of non-180 degrees ferroelectric domain switching is a one-time effect during electrical poling. Here, we show that electric-field-induced non-180 degrees ferroelectric domain switching in the microstructurally engineered material BaTiO3-KNbO3 (BT-KN) is largely reversible. In situ high energy X-ray diffraction showed approximately 95% reversibility in the switched fraction of non-180 degrees ferroelectric domains during unipolar cycling. This reversibility is hypothesised to be due to the unique grain boundary structure of this material, where ferroelectric domain walls do not interact strongly with grain boundary defects. The domain switching behaviour of core-shell BT-KN has been contrasted with that of polycrystalline BaTiO3 and commercial lead zirconate titanate Pb(Zr,Ti)O-3. The large and reversible non-180 degrees ferroelectric domain switching of core-shell BT-KN offers a distinctive strain response. The results indicate a unique family of large strain lead-free materials based on enhanced reversible non-180 degrees ferroelectric domain switching can be developed for future actuator applications. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.



How to cite
APA: Khansur, N.H., Kawashima, H., Wada, S., Hudspeth, J.M., & Daniels, J. (2015). Enhanced extrinsic domain switching strain in core-shell structured BaTiO3-KNbO3 ceramics. Acta Materialia, 98, 182-189. https://dx.doi.org/10.1016/j.actamat.2015.07.034

MLA: Khansur, Neamul Hayet, et al. "Enhanced extrinsic domain switching strain in core-shell structured BaTiO3-KNbO3 ceramics." Acta Materialia 98 (2015): 182-189.

BibTeX: Download
Share link
Last updated on 2017-11-24 at 01:33
PDF downloaded successfully