Issue 17, 2019

Novel bismuth ferrite-based lead-free incipient piezoceramics with high electromechanical response

Abstract

Lead-free piezoceramics with high recoverable strain (or d33*, the large-signal piezoelectric coefficient) and a low degree of hysteresis (Hys) are in great demand for next-generation actuator devices to meet the requirement of sustainable development. Herein, we report a large d33* value of 640 pm V−1 and a low degree of strain hysteresis of 33% in a novel (0.67 − x)BiFeO3–0.33BaTiO3x(Ba0.8Ca0.2)ZrO3 system with x = 2 mol% (BCZ2). A large and linear electrostrictive property (Q33 = 0.029 m4 C−2) was achieved in the BCZ6 composition. Furthermore, the strain and electrostrictive properties present a robust thermal stability. The salient strain performance of BCZ2 can be explained by a reversible field-induced relaxor-ferroelectric phase transition, while the low strain hysteresis is due to a rapid response of forward and backward switching between relaxor and ferroelectric phases facilitated by the weak nonergodicity. The origin of the superior physical properties was systematically elucidated from the micro- and macroscopic views. Our work suggests that the strategy of engineering relaxor dynamics promises to boost the actuating performances, which may pave the way towards exploiting BiFeO3-based incipient piezoceramics in high-precision sensor and actuator applications.

Graphical abstract: Novel bismuth ferrite-based lead-free incipient piezoceramics with high electromechanical response

Supplementary files

Article information

Article type
Paper
Submitted
13 Feb 2019
Accepted
01 Apr 2019
First published
02 Apr 2019

J. Mater. Chem. C, 2019,7, 5122-5130

Novel bismuth ferrite-based lead-free incipient piezoceramics with high electromechanical response

X. Liu, J. Zhai and B. Shen, J. Mater. Chem. C, 2019, 7, 5122 DOI: 10.1039/C9TC00826H

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