In the past, accompanied by the highly asymmetric bipolar strain-electric field (S-E) loop, the ultrahigh strain can be realized in bismuth sodium titanate (BNT)-based ceramics mainly by the B site doping, which seriously restricts the further opening of the research and application scope. Here, regardless of A or/and B sites doping, we observed an ultrahigh unipolar strain response (S = 0.53–0.56% and d33* = 883–933 pm/V, 60 kV/cm) in [Bi0.5(Na0.82-xK0.18Lix)0.5](1-y)Sry(Ti1-zTaz)O3 ceramics by chemical modifications, accompanied by the even higher unipolar strain (∼0.63%, 90 kV/cm) and large field signal (d33* = 990 pm/V, 50 kV/cm). Moreover, the symmetrical bipolar S-E loop is also obtained in this system. In particular, we strictly illuminate the origin of the composition-induced giant strain from the view of the microscopic (A-O bonds weakening), mesoscopic (the coexistence of metastable small-sized ferroelectric domain structures and ergodic relaxor phase), and macroscopic (Tf-r shifting) perspectives. We believe that this work can provide a simple but effective way to optimize the strain behavior in BNT-based ceramics.
|Original language||English (US)|
|Number of pages||8|
|State||Published - Feb 6 2018|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-08
Acknowledgements: Authors gratefully acknowledge the support of the National Science Foundation of China (NSFC No. 51722208 and 51332003). Dr. Jürgen Rödel (Technische Universität Darmstadt, Darmstadt, Germany) is gratefully acknowledged for discussions on the interpretation of the composition-induced giant strain in BNT-based ferroelectric-relaxor materials. Thank the King Abdullah University of Science and Technology (KAUST) for PFM.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Polymers and Plastics
- Metals and Alloys
- Ceramics and Composites
- Electronic, Optical and Magnetic Materials