Giant electrostrain accompanying structural evolution in lead-free NBT-based piezoceramics

Liu, Xing; Xue, Saidong; Liu, Feng; Ma, Jinpeng; Zhai, Jiwei; Shen, Bo; Wang, Feifei; Zhao, Xiangyong; Yan, Haixue

doi:10.1039/c7tc05359b

Cited by 83 publications

(52 citation statements)

References 54 publications

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“…The morphologies of BZT0 comprise irregular large-size ferroelectric domains, corresponding to the bright contrast regions that are marked by the white dashed circles in the central zone of the FFT images. 26,27 Note that the PNRs in the local structure of BZT4 may have sizes below the resolution limit of the current PFM measurements. The domain size decreases for the BZT2 sample, the bright region in the FFT pattern shrinks, and the peak intensities in the histogram decrease compared with that of BZT0.…”

Section: Structural Transformation Analysesmentioning

confidence: 96%

“…[26][27][28] Figure 2A-D,E-H display the PFM phase images and the relevant fast Fourier transformation (FFT) images for BZT0-BZT4 samples, respectively. [26][27][28] Figure 2A-D,E-H display the PFM phase images and the relevant fast Fourier transformation (FFT) images for BZT0-BZT4 samples, respectively.…”

Section: Structural Transformation Analysesmentioning

confidence: 99%

“…Their domain switching histograms are shown in Figure 2I-L. 26,27 For the BZT4 sample, the domain structure completely disappears since the phase and FFT images present no contrast, and the high-angle switching peak in the phase histogram also vanishes. 26 The phase histogram of BZT0 presents two obvious and narrow peaks, indicating the distribution of domains with different orientations.…”

Section: Structural Transformation Analysesmentioning

confidence: 99%

“…26 The phase histogram of BZT0 presents two obvious and narrow peaks, indicating the distribution of domains with different orientations. 26,27 The reduced domain size may render the BZT4 composition more flexible to the external electrical field, which can improve the electromechanical properties. For the BZT3 sample, its domain morphology notably decays, while a small portion of domains are still present in its virgin state.…”

Section: Structural Transformation Analysesmentioning

confidence: 99%

“…Figure S3 provides the definition of S pos , S neg , d * 33 and Hys. [12][13][14][15][16][25][26][27] The P r values exhibit a notable reduction at the BZT3 critical composition, suggesting that the BZT substitution induces a ferroelectric (nonergodic)-relaxor (ergodic) transition. [12][13][14][15][16][25][26][27] The P r values exhibit a notable reduction at the BZT3 critical composition, suggesting that the BZT substitution induces a ferroelectric (nonergodic)-relaxor (ergodic) transition.…”

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confidence: 99%

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Designing novel sodium bismuth titanate lead‐free incipient perovskite for piezoactuator applications

2019

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Bismuth‐based lead‐free incipient piezoceramics have potential in piezoactuators owing to their large strain response. However, a substantial strain hysteresis and poor temperature/frequency stability heavily restrict their practical applications. Herein, we designed a compositional inhomogeneity and constructed quenched random fields to enhance the relaxor dynamics by introducing a classical relaxor material, Ba(Zr0.2Ti0.8)O3, into a nonergodic material, (Na0.5Bi0.5)TiO3–0.15SrTiO3. Intriguingly, we obtained a large piezoelectric d33∗ coefficient of 602 pm/V and a narrow hysteresis of 32% at the x = 0.04 (BZT4) composition. The strain properties present a robust frequency (~2%, 1‐20 Hz) and temperature stability (~13%, 25‐150°C). The excellent actuating properties of BZT4 were due to a field‐induced reversible ergodic relaxor‐ferroelectric transformation, and the narrow hysteresis can be attributed to quick switching of the dynamic relaxor phase to external stimuli. The origin of the structural transition and salient strain performance was systematically investigated. This study provides a novel route for designing lead‐free incipient perovskite with a large strain, narrow hysteresis and high stability for eco‐friendly actuators.

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Section: Structural Transformation Analysesmentioning

confidence: 96%

Section: Structural Transformation Analysesmentioning

confidence: 99%

Section: Structural Transformation Analysesmentioning

confidence: 99%

Section: Structural Transformation Analysesmentioning

confidence: 99%

mentioning

confidence: 99%

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Designing novel sodium bismuth titanate lead‐free incipient perovskite for piezoactuator applications

2019

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High‐Performance Strain of Lead‐Free Relaxor‐Ferroelectric Piezoceramics by the Morphotropic Phase Boundary Modification

Liu

Shi

et al. 2022

Adv Funct Materials

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Bismuth sodium titanate (BNT)‐based lead‐free piezoceramics are promising for replacing lead‐based piezoceramics in piezoelectric actuators due to their large strains. However, achieving low‐hysteresis large‐strain BNT‐based ceramics over a broad temperature range is challenging, owing to the complexity of the composition design and phase transformation. Herein, a lead‐free relaxor‐ferroelectric (1−x)Bi0.47Na0.47Ba0.06TiO3‐xK0.47Na0.47Li0.06Nb0.99Sb0.01O2.99 system (BNBT‐KNLNS) near the morphotropic phase boundary (MPB), achieved by phase‐field simulations and rational composition design (i.e., BNBT with the MPB as the base and the ferroelectric phase of KNLNS as the dopant) is reported. This ceramic exhibits large strains (0.32–0.51%) and low strain hysteresis (11.1–59.9%) over a wide temperature range (25–125 °C), outperforming many state‐of‐the‐art lead‐free piezoceramics. A small fraction of ferroelectric states embedded in the relaxor matrix is experimentally observed, where these states act as seeds, facilitating the reversible relaxor‐to‐ferroelectric transition. In addition, the MPB composition with low energy barriers yields large strain responses, owing to the easy polarization reversal and extension. Consequently, low‐hysteresis large strains are obtained over a broad temperature range. This work provides a novel design route for discovering high‐performance piezoceramics for actuator applications.

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Polarization Rotation Control Domain Dynamic Response Modulates Piezoelectric Properties of Lead‐Free Thin Films

Zhu

Lin

et al. 2022

Adv Elect Materials

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Domain orientation engineering regulates the polarization direction of thin film and facilitates the enhancement of piezoelectric properties. A change in polarization direction implies a structural change in the piezoelectric thin film. In this work, some unexpected results are obtained by preparing three orientations of Bi0.5Na0.5TiO3‐based lead‐free piezoelectric thin films to amplify this structural change. In distinction to the conventional perception, the piezoelectric properties decrease with increasing polarization direction. This anomaly is influenced by the concentration of structural defects, and rotation of the polarization direction may induce a change in the electronic structure of the material and hence in the concentration of structural defects. Ultimately, the suppression of the domain dynamics response by increasing structural defects leads to the worst piezoelectric properties for thin films with the traditionally perceived optimal (100) orientation. The revelation of this anomaly has implications for the design of the next generation of high‐performance piezoelectric thin films.

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Giant electrostrain accompanying structural evolution in lead-free NBT-based piezoceramics

Abstract: Lead-free NBT-based piezoceramics: local defects boost ferroelectric instability and giant electrostrain.

Cited by 83 publications

References 54 publications

Designing novel sodium bismuth titanate lead‐free incipient perovskite for piezoactuator applications

Designing novel sodium bismuth titanate lead‐free incipient perovskite for piezoactuator applications

High‐Performance Strain of Lead‐Free Relaxor‐Ferroelectric Piezoceramics by the Morphotropic Phase Boundary Modification

Polarization Rotation Control Domain Dynamic Response Modulates Piezoelectric Properties of Lead‐Free Thin Films

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