Large nonlinear electrostrain and piezoelectric response in nonergodic (Na, K)0.5Bi0.5Ti O3: Synergy of structural disorder and tetragonal phase in proximity to a morphotropic phase boundary

Das Adhikary, G and Dwij, V and Senyshyn, A and Sathe, V and Ranjan, R (2021) Large nonlinear electrostrain and piezoelectric response in nonergodic (Na, K)0.5Bi0.5Ti O3: Synergy of structural disorder and tetragonal phase in proximity to a morphotropic phase boundary. In: Physical Review Materials, 5 (6).

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Abstract

Among the different piezoceramics, Na0.5Bi0.5TiO3 (NBT)-based systems have the unique distinction of exhibiting very large electrostrain (>0.5) when pushed at the threshold of ergodic-nonergodic relaxor transition. However, this strategy severely compromises the system's weak-signal piezoelectric response (d33). Here, we show that a similar level of electrostrain is feasible together with high d33 by a different approach. In our approach, the system is kept well within the nonergodic relaxor regime close to an interferroelectric instability, and the inherent structural (tilt) disorder is exploited for large reverse switching of the ferroelastic domains in the field-stabilized ferroelectric phase. A synergy of this combination is demonstrated in (1-x)Na0.5Bi0.5TiO3-(x)K0.5Bi0.5TiO3; x=0.25 which exhibit electrostrain of �0.6 and d33 (�210 pC/N). With the added advantage of high depolarization temperature (Td�185�C) this piezoceramic stands unique for showing the best combination of the three most sought after properties. © 2021 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review Materials
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to American Physical Society
Keywords:	Bismuth compounds; Ferroelectric materials; Piezoelectric ceramics; Piezoelectricity; Sodium compounds, Depolarization temperature; Ferroelastic domains; Ferroelectric phase; Morphotropic phase boundaries; Na0.5Bi0.5TiO3; Piezoelectric response; Structural disorders; Tetragonal phase, Titanium compounds
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Sep 2021 11:59
Last Modified:	02 Sep 2021 11:59
URI:	http://eprints.iisc.ac.in/id/eprint/69616

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