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Issue 17, 2019
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Novel bismuth ferrite-based lead-free incipient piezoceramics with high electromechanical response

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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

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Publication details

The article was received on 13 Feb 2019, accepted on 01 Apr 2019 and first published on 02 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00826H
J. Mater. Chem. C, 2019,7, 5122-5130

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    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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