Thermally-induced local structural transformations in Na0.5Bi0.5TiO3-KNbO3 ceramics

Wang, Ge; Goetzee-Barral, Anton; Lu, Zhilun; Keeble, Dean S.; Hall, David A.

doi:10.1016/j.jeurceramsoc.2021.01.040

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…However, differences are observed comparing results obtained from dielectric and pyroelectric measurements with those obtained from ex situ d 33 ‐ T tests. This phenomenon was also reported in other BNT‐based systems 12,25,42 . For example, although T d for BNT‐0.2BKT is observed around 140°C, a strong temperature dependence of piezoelectric activity and deterioration of properties can be observed starting from about 70°C 25 .…”

Section: Resultssupporting

confidence: 77%

“…It can be seen two different dielectric anomalous peaks near T FR and T m as shown in Figure 9D. The T FR is reported to be related to the FE‐RE phase transition, and the T m results from the thermal evolution of rhombohedral R3c and tetragonal P4bm mixture 42 . The dielectric dispersion around T FR almost stays unchanged with increasing T s .…”

Section: Resultsmentioning

confidence: 86%

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Effect of sintering temperature on the depolarization behavior of (Bi_0.5Na_0.5)TiO₃‐based ceramics

et al. 2021

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Bi 0.5 Na 0.5 )TiO 3 (BNT)-based ferroelectric ceramics have drawn extensive attention because of their excellent electrical properties and interesting depolarization behavior. However, the poor thermal stability of electrical properties limits their practical application. In this work, the effect of sintering temperature (T s ) on the depolarization behavior of BNT-based ceramics was systematically investigated. It is found that the depolarization temperature T d determined from pyroelectric measurement tends to decrease with increasing T s , which indicates that lower T s defers the ferroelectricrelaxor (FE-RE) phase transition. However, for the samples sintered at higher T s (such as 1180°C), although the T d is reduced, the thermal stability is better compared with the sample sintered at lower T s (1100°C) because the diffuse behavior of the FE-RE phase transition is suppressed. According to these results, we propose that the thermal stability of electrical properties for BNT-based ceramics is not only related to high T d , but also to the diffuse degree of phase transition. K E Y W O R D Sbismuth titanates, ferroelectricity/ferroelectric materials, lead-free ceramics 1 | INTRODUCTION (Bi 0.5 Na 0.5 )TiO 3 (BNT)-based ferroelectric ceramics have drawn extensive attention because of their large polarization, giant electro-strain, excellent energy storage performance, and interesting depolarization behavior. [1][2][3][4][5][6] Since BNT-based ceramics have made great progress in electrical properties in recent decades, BNT-based ceramics are considered to How to cite this article:

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 86%

Effect of sintering temperature on the depolarization behavior of (Bi_0.5Na_0.5)TiO₃‐based ceramics

et al. 2021

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“…Lead-, NBT-, and BF-based materials exhibit extraordinarily high ΔP (up to ∼60 μC cm –2 ), followed by AFE NN- and AN-based (up to ∼40 μC cm –2 ) and KNN-based materials (up to ∼35 μC cm –2 ) with the lowest (up to ∼25 μC cm –2 ) for BT- and ST-based materials. Bicontaining electroceramics such as NBT and BF, have been heavily studied recently as potential lead-free electroceramic materials due to their large polarization. ,,,,,− A high ΔP (60 μC cm –1 ) is obtained in NBT and BF based by reducing the P r through chemical substitution with other perovskite end members to form a relaxor with an ultraslim P–E loop. To some extent therefore, the advantage of a high intrinsic polarization end member such as BF is weakened.…”

Section: State-of-the-art In Electroceramics For Energy Storagementioning

confidence: 99%

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

et al. 2021

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Materials exhibiting high energy/power density are currently needed to meet the growing demand of portable electronics, electric vehicles and large-scale energy storage devices. The highest energy densities are achieved for fuel cells, batteries, and supercapacitors, but conventional dielectric capacitors are receiving increased attention for pulsed power applications due to their high power density and their fast charge–discharge speed. The key to high energy density in dielectric capacitors is a large maximum but small remanent (zero in the case of linear dielectrics) polarization and a high electric breakdown strength. Polymer dielectric capacitors offer high power/energy density for applications at room temperature, but above 100 °C they are unreliable and suffer from dielectric breakdown. For high-temperature applications, therefore, dielectric ceramics are the only feasible alternative. Lead-based ceramics such as La-doped lead zirconate titanate exhibit good energy storage properties, but their toxicity raises concern over their use in consumer applications, where capacitors are exclusively lead free. Lead-free compositions with superior power density are thus required. In this paper, we introduce the fundamental principles of energy storage in dielectrics. We discuss key factors to improve energy storage properties such as the control of local structure, phase assemblage, dielectric layer thickness, microstructure, conductivity, and electrical homogeneity through the choice of base systems, dopants, and alloying additions, followed by a comprehensive review of the state-of-the-art. Finally, we comment on the future requirements for new materials in high power/energy density capacitor applications.

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“…Recently, an electric‐field induced structural transformation from pseudo‐cubic to rhombohedral was also reported in the (1‐x)NBT‐xKN solid solutions with x = 0.01–0.05 . This transformation was also found to be reversible upon heating …”

Section: Introductionmentioning

confidence: 77%

“…For measurement of ferroelectric properties, the specimens were placed in a silicone oil bath and tested using an electric field up to 6.5 kV mm −1 at a frequency of 1 Hz. The amplitude of the electric field was confirmed to be beyond coercive field for NBT‐based materials, thereby allowing investigations of the electric field‐induced structural transformation . Ferroelectric polarization‐electric field loops were recorded using the method described previously .…”

Section: Methodsmentioning

confidence: 99%

Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na_0.5Bi_0.5TiO₃‐NaNbO₃ ceramics

Wang

Zhang

et al. 2019

J Am Ceram Soc

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(1‐x)Na0.5Bi0.5TiO3‐xNaNbO3 (x = 0.02, 0.04, 0.06, and 0.08) ceramics were fabricated by solid‐state reaction. High‐resolution synchrotron x‐ray powder diffraction (SXPD) data, coupled with macroscopic electromechanical measurements, reveal the occurrence of an electric field‐induced irreversible crystallographic transformation for x = 0.02 and 0.04, from a pseudo‐cubic non‐ergodic relaxor to a rhombohedral or coexisting rhombohedral‐tetragonal long range‐ordered ferroelectric phase, respectively. The highest unipolar electrostrain, corresponding to an effective longitudinal piezoelectric strain coefficient of approximately 340 pm V−1, was obtained for x = 0.04; this effect is attributed to enhanced domain switching as a result of the co‐existing rhombohedral and tetragonal phases for this composition, which is critical for piezoelectric actuator applications.

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Thermally-induced local structural transformations in Na0.5Bi0.5TiO3-KNbO3 ceramics

Cited by 9 publications

References 38 publications

Effect of sintering temperature on the depolarization behavior of (Bi_0.5Na_0.5)TiO₃‐based ceramics

Effect of sintering temperature on the depolarization behavior of (Bi_0.5Na_0.5)TiO₃‐based ceramics

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na_0.5Bi_0.5TiO₃‐NaNbO₃ ceramics

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Thermally-induced local structural transformations in Na0.5Bi0.5TiO3-KNbO3 ceramics

Cited by 9 publications

References 38 publications

Effect of sintering temperature on the depolarization behavior of (Bi0.5Na0.5)TiO3‐based ceramics

Effect of sintering temperature on the depolarization behavior of (Bi0.5Na0.5)TiO3‐based ceramics

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na0.5Bi0.5TiO3‐NaNbO3 ceramics

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Product

Resources

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Effect of sintering temperature on the depolarization behavior of (Bi_0.5Na_0.5)TiO₃‐based ceramics

Effect of sintering temperature on the depolarization behavior of (Bi_0.5Na_0.5)TiO₃‐based ceramics

Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na_0.5Bi_0.5TiO₃‐NaNbO₃ ceramics