Insight into the large electro-strain in bismuth sodium titanate-based relaxor ferroelectrics: From fundamentals to regulation methods

Wu, Xiaojun; Wen, Lanji; Wu, Chao; Lv, Xiang; Yin, Jie; Wu, Jiagang

doi:10.1016/j.jmst.2022.12.016

Cited by 20 publications

(5 citation statements)

References 88 publications

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“…A possible model called the rigid ion model of crystals depicted in Figure 4a-c is proposed to phenomenologically explain the strain recoverability observed in this piezoceramic. The potential energy U of an ion-pair can be expressed as follows [49]…”

Section: K∕na -V ⋅⋅mentioning

confidence: 99%

“…The energy required to compress the ion-pair (Ur) is greater than that needed to stretch the ion-pair (Ua), leading to a more potent recovery force under the positive bias fields. [49] Consequently, superimposing a positive dc bias seems to be more effective in reducing the strain hysteresis, albeit at the expense of a decrease in the unipolar strain performance. A negative dc bias is highly desirable for enhancing the strain performance and reducing the strain hysteresis concurrently.…”

Section: K∕na -V ⋅⋅mentioning

confidence: 99%

See 1 more Smart Citation

Defect Dipole‐Induced Fatigue Strain Recoverability in Lead‐Free Piezoelectric Ceramics

Wang,

Huangfu,

Wang

et al. 2023

Adv Funct Materials

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Piezoelectric ceramics have garnered extensive utilization in high‐precision actuators, where the magnitude of electric field‐induced strain and fatigue resistance play crucial roles in actuation applications. Herein, an innovative strategy based on defect dipoles is proposed to form a defect‐engineered polymorphic phase transition and achieve a giant piezoelectric strain coefficient of 3080 pm V−1 in Li/Sr‐doped (K0.5Na0.5)NbO3 lead‐free piezoceramics. The mechanism responsible for the enhanced strain performance lies in the optimized strain compatibility between the refined stripe domains and the nanosized domains. Additionally, the results demonstrate that the material is able to recover from fatigue‐induced strain depletion under the stimulation of bipolar electric fields. This property can be phenomenologically explained by the rigid ion model, in which the application of reversal electric fields can facilitate the restoration of defect dipoles, thereby greatly contributing to strain recoverability. This study establishes a close correlation between the unipolar strain properties and the inherent flexibility of defect dipoles and provides new insight into the design of high‐reliability, large‐stroke piezoceramics.

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Section: K∕na -V ⋅⋅mentioning

confidence: 99%

Section: K∕na -V ⋅⋅mentioning

confidence: 99%

Defect Dipole‐Induced Fatigue Strain Recoverability in Lead‐Free Piezoelectric Ceramics

Wang,

Huangfu,

Wang

et al. 2023

Adv Funct Materials

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“…The interaction between the polarization intensity and consequent strain output displays a fascinating research hotspot when applying an electric field to ferroelectric materials. This strain is primarily due to the intrinsic contributions from the inverse piezoelectric effect and electrostriction, which are brought about by the ion displacement from its equilibrium position, resulting in negligible hysteresis of S-E curves, which is advantageous for practical applications [49]. The extrinsic contribution includes non-180 • domain wall motion and the phase transition produced by electric field-induced paraelectric-ferroelectric phase transition, ferroelectric phase transition, and antiferroelectric-ferroelectric phase transition [49,50].…”

Section: Structural Origin Of Strain In Bnt-based Materialsmentioning

confidence: 99%

“…This strain is primarily due to the intrinsic contributions from the inverse piezoelectric effect and electrostriction, which are brought about by the ion displacement from its equilibrium position, resulting in negligible hysteresis of S-E curves, which is advantageous for practical applications [49]. The extrinsic contribution includes non-180 • domain wall motion and the phase transition produced by electric field-induced paraelectric-ferroelectric phase transition, ferroelectric phase transition, and antiferroelectric-ferroelectric phase transition [49,50]. These will lead to hysteresis and nonlinear S-E loops, giving rise to more complicated strain [51].…”

Section: Structural Origin Of Strain In Bnt-based Materialsmentioning

confidence: 99%

Defect Dipole Behaviors on the Strain Performances of Bismuth Sodium Titanate-Based Lead-Free Piezoceramics

Wang

Liu

et al. 2023

Materials

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Bismuth sodium titanate (BNT)-based, lead-free piezoelectric materials have been extensively studied due to their excellent strain characteristics and environmental friendliness. In BNTs, the large strain (S) usually requires a relatively large electric field (E) excitation, resulting in a low inverse piezoelectric coefficient d33* (S/E). Moreover, the hysteresis and fatigue of strain in these materials have also been bottlenecks impeding the applications. The current common regulation method is chemical modification, which mainly focuses on forming a solid solution near the morphotropic phase boundary (MPB) by adjusting the phase transition temperature of the materials, such as BNT-BaTiO3, BNT-Bi0.5K0.5TiO3, etc., to obtain a large strain. Additionally, the strain regulation based on the defects introduced by the acceptor, donor, or equivalent dopant or the nonstoichiometry has proven effective, but its underlying mechanism is still ambiguous. In this paper, we review the generation of strain and then discuss it from the domain, volume, and boundary effect perspectives to understand the defect dipole behavior. The asymmetric effect caused by the coupling between defect dipole polarization and ferroelectric spontaneous polarization is expounded. Moreover, the defect effect on the conductive and fatigue properties of BNT-based solid solutions is described, which will affect the strain characteristics. The optimization approach is appropriately evaluated while there are still challenges in the full understanding of the defect dipoles and their strain output, in which further efforts are needed to achieve new breakthroughs in atomic-level insight.

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“…However, the strategies of core-shell structure regulation and texturing techniques are quite inconvenient, making it hard to modulate easily and accurately its strain properties [20,21]. Therefore, exploring simple and effective methodologies to improve strain performance has become more urgent [22,23].…”

Section: Introductionmentioning

confidence: 99%

Modulation of phase boundary and domain structures to engineer strain properties in BNT-based ferroelectrics

Yang,

Liu,

Ren

et al. 2024

Journal of Advanced Ceramics

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Bismuth sodium titanate (BNT) ceramics have outstanding strain responses but are unfavorable for applications in high-sensitivity displacement actuators due to large negative strain resulting from irreversible changes in their phase transition and domain structure. Here, (1-x)Bi0.50Na0.41K0.09TiO3-xNaNbO3 (BNKT-xNN) solid solutions were prepared to promote the strain properties through the strategy of modulating the phase boundary and domain structures. The introduction of sodium niobate could effectively regulate the relative content of tetragonal (P4bm) and rhombohedral (R3c) phases in the phase boundary region. The ferroelectric-to-relaxor phase transition (TF-R) was reduced and the ergodic relaxor (ER) state was nurtured at room temperature. An excellent zero-negative strain properties of S = 0.41% and d33* = 742 pm/V were achieved from the reversible transition between the ER and J u s t A c c e p t e d ferroelectric states under applied electric-field (x = 0.04). Additionally, understanding from domain states in piezoelectric force microscopy (PFM) and first-order reversal curves (FORC), the superior strain responses originated from the reversible inter-transformation of sub-stable macro-domains and polar nano-regions (PNRs) in the phase boundary. This study provides a new insight into the interplay between the evolution of phase boundary and domain structures and the strain properties of BNT-based ceramics.

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Insight into the large electro-strain in bismuth sodium titanate-based relaxor ferroelectrics: From fundamentals to regulation methods

Cited by 20 publications

References 88 publications

Defect Dipole‐Induced Fatigue Strain Recoverability in Lead‐Free Piezoelectric Ceramics

Defect Dipole‐Induced Fatigue Strain Recoverability in Lead‐Free Piezoelectric Ceramics

Defect Dipole Behaviors on the Strain Performances of Bismuth Sodium Titanate-Based Lead-Free Piezoceramics

Modulation of phase boundary and domain structures to engineer strain properties in BNT-based ferroelectrics

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