High electrostrictive strain in lead-free relaxors near the morphotropic phase boundary

Li, Tangyuan; Liu, Chang; Ke, Xiaoqin; Liu, Xiao; He, Liqiang; Shi, Peng; Ren, Xiaobing; Wang, Yunzhi; Lou, Xiaojie

doi:10.1016/j.actamat.2019.10.034

Cited by 59 publications

(22 citation statements)

References 39 publications

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“…As for BNT-based ferroelectric materials, their superior electro-strain with negligible hysteresis can be rationalized by the relaxor theory, which is attracting more and more attention in recent years. 19,43 At the ferroelectric-relaxor phase transition temperature T F-R , large-sized ferroelectric domains transform into small-sized PNRs, accompanied with the formation of nonergodic relaxor (NR) and ergodic relaxor (ER) phases. 44,45 And NR phase is actuated to evolve into metastable ER phase as the temperature sequentially rises.…”

Section: Introductionmentioning

confidence: 99%

“…The electrostrictive effect can be described by the equation S 33 = Q 33 · P 2 , where Q 33 is the longitudinal electrostrictive coefficient obtained by linear fitting S and P 2 4 . Therefore, seeking an effective way to simultaneously enhance the electrostrictive coefficient Q 33 and ferroelectric polarization P is the endeavor to obtain the superior electro‐strain responses, while these two parameters are often incompatible 4–40 …”

Section: Introductionmentioning

confidence: 99%

“…Comparison of lead‐contained, BT‐based, BNT‐based materials and this work against their (A) square of polarization vs electro‐strain 4‐8 and (B) electro‐strain vs electrostrictive coefficient Q 33 8–40 [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

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Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

et al. 2020

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For ferroelectric electrostrictors, shifting their Curie temperature T C to the ambient temperature is an effective way to enhance their electrostrictive effect. However, the enhanced electrostrictive coefficient Q 33 in this way is often accompanied with an inferior electro-strain. In this work, by introducing CaZrO 3 /BaZrO 3 as the special kind of solid solution, with an effective regulation on the ergodic state, we simultaneously realize a larger room-temperature electrostrictive coefficient Q 33 (~0.04337 m 4 /C 2) with a superior electro-strain (~0.41%) in Bi 0.5 Na 0.5 TiO 3-based relaxor ferroelectric ceramics. The ions substitution with larger radius in either A-site or B-site of perovskite structure tends to facilitate the evolution from ferroelectric tetragonal phase P4mm to relaxor tetragonal phase P4bm along with the decrease in polarity in crystal, thereby shifting the transition temperature T F-R below room temperature. As a result of the effective regulation on the ergodic state, a large electro-strain with low hysteresis, just like electrostrictors, is successfully realized in BNT-based ferroelectric ceramics. Our investigation provides an effective way to simultaneously enhance the electrostrictive coefficient Q 33 and electro-strain for practical applications in precisely controlled displacement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

et al. 2020

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“…It should be noticed that the energy storage density would be further improved in ANTx multilayer ceramics and film capacitors, due to the significantly increased breakdown strength. In addition, the unfolding of RAFE characteristic of M2-M3 phase boundary on atomic scale in AN-based solid solution gives a solid evidence to the long-term confusion of the broad dielectric anomaly over M2-M3 phase transition temperature, which opens a broad range of applications where relaxor feature is desired, such as electrocaloric solid-state cooling devices 59,60 and hysteresis-free actuators 61,62 . The mixed powders were dried and then calcined at 900°C for 6 h in oxygen atmosphere, followed by a second ball milling.…”

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confidence: 96%

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

et al. 2020

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Dielectric capacitors with high energy storage density (Wrec) and efficiency (η) are in great demand for high/pulsed power electronic systems, but the state-of-the-art lead-free dielectric materials are facing the challenge of increasing one parameter at the cost of the other. Herein, we report that high Wrec of 6.3 J cm-3 with η of 90% can be simultaneously achieved by constructing a room temperature M2–M3 phase boundary in (1-x)AgNbO3-xAgTaO3 solid solution system. The designed material exhibits high energy storage stability over a wide temperature range of 20–150 °C and excellent cycling reliability up to 106 cycles. All these merits achieved in the studied solid solution are attributed to the unique relaxor antiferroelectric features relevant to the local structure heterogeneity and antiferroelectric ordering, being confirmed by scanning transmission electron microscopy and synchrotron X-ray diffraction. This work provides a good paradigm for developing new lead-free dielectrics for high-power energy storage applications.

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“…The structure is rhombohedral for Zr-rich compositions (Zr:Ti >54:46) while it is tetragonal for Ti-rich compositions (Zr:Ti <48:52). Both rhombohedral and tetragonal phases coexist in the intermediate compositions by morphotropic phase boundary (MPB) [14][15][16][17][18][19][20][21][22]. Adding various dopants within the basic matrix is the method to vary different properties.…”

Section: Introductionmentioning

confidence: 99%

Structural and dielectric properties of (1-x)Pb(Zr0.53Ti0.47)O3-xGdMnO3 ceramics

et al. 2021

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Ceramics compositions (1-x)Pb(Zr 0.53 Ti 0.47 )O 3 -xGdMnO 3 (x= 0, 0.01, 0.02, 0.03, 0.04, and 0.05) were synthesized by solid-state route and sintered at 1180 °C for 2 h. Structural, microstructural, and dielectric properties of the system were investigated. X-ray structural analysis of the materials confirmed their formation in a single phase with a tetragonal crystal structure. The PZT ceramics doped with 0.04 moles of GdMnO 3 exhibited denser and finer microstructures, which produced a high relative density of 7.22 g/cm 3 (~98% of the theoretic density). Scanning electron microscopy showed uniform distribution of grain and grain boundaries. Comparing with the undoped ceramics, the dielectric properties of the GM-doped PZT specimens are significantly improved. The maximum dielectric constant (ε r =475324) and the minimum dielectric loss (6%) were observed for 0.04 moles of GdMnO 3 , which indicated that the PZT-GM ceramics are promising to lead to practical applications.

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High electrostrictive strain in lead-free relaxors near the morphotropic phase boundary

Cited by 59 publications

References 39 publications

Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

Large electrostrictive coefficient with high electro‐strain dominated by modified ergodic state in BNT‐based solid solutions

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

Structural and dielectric properties of (1-x)Pb(Zr0.53Ti0.47)O3-xGdMnO3 ceramics

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