Temperature-insensitive large strain response with a low hysteresis behavior in BNT-based ceramics

Bai, Wangfeng; Chen, Daqin; Huang, Yanwei; Zheng, Peng; Zhong, Jiasong; Ding, Mingye; Yuan, Yong‐Jun; Shen, Bo; Zhai, Jiwei; Ji, Zhenguo

doi:10.1016/j.ceramint.2016.01.181

Cited by 99 publications

(44 citation statements)

References 69 publications

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“…When the Ta 2 O 5 content increases to 0.005, although the shape of the positive electro‐strain is still relatively full, it is observed that the S neg decreases drastically, demonstrating typical relaxor behavior . The bipolar electro‐strain of these components changes from a butterfly‐shaped turn to a sprout‐shaped turn, indicating the decreased amount of large‐sized ferroelectric domains left in the samples . Similar to the previous reports in BNT‐BT‐BNiT ceramics, these phenomena should be attributed to the instability of the ferroelectricity .…”

Section: Resultssupporting

confidence: 80%

“…It is observed that the polarization hysteresis loop of pure BNKLT is typical of normal ferroelectrics with P max ~ 38.8 μC/cm 2 , P r ~ 22.5 μC/cm 2 , and low E C ~ 15.03 kV/cm. For 0 ≤ x ≤ 0.005, the P max almost keeps stable, but P r and E C have a significant decrease, due to the electric field‐induced state transition from relaxor to the ferroelectrics . These results indicate that the ferroelectric state in the undoped BNKLT‐based ceramics is severely destroyed with the increase in the Ta 2 O 5 content, leaving the “weak” ferroelectric state or the ergodic relaxor state .…”

Section: Resultsmentioning

confidence: 95%

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BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

Han

Yin

2019

J Am Ceram Soc

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Due to their superior piezo‐responses (strain S > 0.3%), bismuth sodium titanate (BNT)‐based relaxor ferroelectrics have received much attention. Compared to other chemical elements, tantalum (Ta) doping provides superior electro‐strain for these ferroelectrics, while the effect of Ta2O5 as oxide additive has been rarely reported. Herein, lead‐free piezoceramics of Bi0.5(Na0.72K0.22Li0.06)0.5TiO3‐xTa2O5 (BNKLT‐xTa2O5, x = 0‐0.015) are synthesized. We study the effects of Ta2O5 addition on the crystal structure, piezoelectric responses, dielectric properties, and ferroelectric properties of BNKLT ceramics. All of the ceramics exhibit a typical perovskite structure, and Ta2O5 diffuses into the BNKLT lattice to form a uniform solid solution. The addition of Ta2O5 can make the grains more regular and uniform, while excess Ta2O5 result in finer grains. The undoped BNKLT ceramics show good ferroelectric and piezoelectric properties (remnant polarization Pr = 22.5 μC/cm2 and piezoelectric coefficient d33 = 250 pC/N); however, the addition of Ta2O5 leads to an clear degradation in d33 and Pr. Meanwhile, the addition of an appropriate Ta2O5 amount leads to an increase in the electro‐strain, and the unipolar strain reaches 0.385% under 60 kV/cm for x = 0.003, together with a higher normalized strain (d33*=Smax/Emax) of 633 pm/V (x = 0.003). The enhanced strain behaviors can be attributed to the coexistence of the ferroelectric and relaxor states, and an excellent electrostriction coefficient Q33 (Q33 = S/P2) value of 0.038 m4C−2 is obtained under 60 kV/cm for x = 0.003.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 95%

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

Han

Yin

2019

J Am Ceram Soc

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“…When the testing temperatures reached 125‐150°C, a good electrostriction curve was obtained, and an electrostrictive coefficient Q 33 of 0.0758 m 4 C −2 was found. This value has not been reached in previous experiments using singular doping with either La 3+ or Nb 5+ and is superior to most previously reported Q 33 at both room temperature and at the temperature of 125‐150°C …”

Section: Resultscontrasting

confidence: 78%

Modulation of electrostriction and strain response in bismuth sodium titanate‐based ceramics

et al. 2018

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The electrostriction and strain response of lead‐free Bi0.5Na0.5TiO3–BaTiO3 piezoceramics with La and Nb [(Bi0.47Na0.47Ba0.06)1−xLaxTi1−yNbyO3] were modified by optimizing the depolarization temperature. The influences of La and Nb on their phase structure and electrical properties were systematically investigated. All the ceramics exhibited a pseudocubic phase, which is independent of the addition of La and Nb. The strain values increased gradually with the addition of La, and a high strain of ~0.5% (80 kV/cm) was attained without any remnant strain when the compositions had a value of x = 0.015. Instead, the piezoelectric constant d33 dropped down ~20 pC/N due to the shift of the Td (or Tf−r) to room temperature. Interestingly, by establishing the relationship between Td and strain values, it should be feasible to optimize the strain property of Bi0.5Na0.5TiO3 (BNT)‐based ceramics by regulating Td to ambient temperature. In addition, a very high electrostriction coefficient Q33 of ~0.0758 m4 C−2 can be found under high temperatures of 125 and 150°C. We believe that the strain and electrostriction behavior of BNT‐based ceramics can be well modified by the modulation of depolarization temperature.

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“…One of their most important properties is the displacement induced by an electric field. Recently, the giant electric‐field‐induced strain of (Bi,Na)TiO 3 [BNT] based lead‐free ceramics has shed light on the potential to develop large‐stroke actuator applications, without the environmental issues of lead based materials . In particular, (Bi,Na)TiO 3 – x SrTiO 3 [BNT– x ST] ceramics have exhibited a strain response of 0.30% at a relatively low electric field, surpassing commercial Pb(Zr,Ti)O 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical inhomogeneity on domains and ferroelectric properties of Fe‐modified 0.77Bi_0.5Na_0.5TiO₃–0.23SrTiO₃

et al. 2018

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Lead‐free 0.77(Bi0.5Na0.5)TiO3–0.23Sr(Ti1−xFex)O3 (x = 0, 0.04) (BNT–23STFx) was prepared using a conventional solid‐state reaction route. The effects of Fe‐modification on the chemical homogeneity from a μm scale perspective, the core‐shell domains structures, and the ferroelectric properties were investigated. The chemical homogeneity was analyzed using energy dispersive X‐ray mapping in scanning transmission electron microscopy mode, and the field‐dependent behaviors of strain and polarization were obtained to determine the ferroelectric properties. Substituting Fe3+ for Ti4+ resulted in completely different electrical behavior and properties, despite similar XRD patterns and microstructures. The Fe‐substitution promoted the mobility of Sr2+ ions in the BNT phase and, as a consequence, the chemical homogeneity increased and the core‐domains collapsed. Extending the ceramic processing, such as milling time and sintering time, affected domain distribution and compositional inhomogeneity, which led to a gradual transformation from ferroelectric to relaxor.

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Temperature-insensitive large strain response with a low hysteresis behavior in BNT-based ceramics

Cited by 99 publications

References 69 publications

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

Modulation of electrostriction and strain response in bismuth sodium titanate‐based ceramics

Effect of chemical inhomogeneity on domains and ferroelectric properties of Fe‐modified 0.77Bi_0.5Na_0.5TiO₃–0.23SrTiO₃

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Temperature-insensitive large strain response with a low hysteresis behavior in BNT-based ceramics

Cited by 99 publications

References 69 publications

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta2O5 oxide addition

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta2O5 oxide addition

Modulation of electrostriction and strain response in bismuth sodium titanate‐based ceramics

Effect of chemical inhomogeneity on domains and ferroelectric properties of Fe‐modified 0.77Bi0.5Na0.5TiO3–0.23SrTiO3

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Product

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BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

Effect of chemical inhomogeneity on domains and ferroelectric properties of Fe‐modified 0.77Bi_0.5Na_0.5TiO₃–0.23SrTiO₃