Novel Bismuth Ferrite-Based Lead-Free Incipient Piezoceramics with High Electromechanical Response
31 Pages Posted: 11 Dec 2018 First Look: Under Review
Lead-free piezoceramics with high recoverable strain (d33*) and 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 and a low degree of strain hysteresis of 33 % in a novel (0.67-x)BiFeO3-0.33BaTiO3-x(Ba0.8Ca0.2)ZrO3 system with x=2 mol% (BCZ2). A large and linear electrostrictive property (Q33=0.029 m4/C2) was achieved in 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 view. Our work suggests that the strategy of engineering relaxor dynamics is promising to boost the actuating performances, which may pave the way towards exploiting BiFeO3-based incipient piezoceramics in high-precision sensor and actuator applications.
Keywords: Bismuth ferrite, Relaxor ferroelectrics, Electromechanical properties, Domain structure
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