Bi0.5K0.5TiO3–CaTiO3 ceramics: Appearance of the pseudocubic structure and ferroelectric‐relaxor transition characters

Wei, Yongxing; Zhang, Ning; Jin, Changqing; Zhu, Wenqi; Zeng, Yiming; Xu, Gang; Gao, Ling; Jian, Zengyun

doi:10.1111/jace.16244

Cited by 26 publications

(13 citation statements)

References 45 publications

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“…The RFE states of BKT-D1 and BT-D2 can be identified by the board peak in the dielectric spectrum, with the diffuseness parameter γ being 1.82 and 1.92 (Figure S4), respectively. A significant frequency-dependent dielectric maximum is observed, with Δ T max being 90 K for BKT-D1, and 70 K for BT-D2, indicating the presence of small size and weakly coupled polar nanoregions. , These relaxor features will be beneficial to the high-field energy storage performance.…”

Section: Resultsmentioning

confidence: 95%

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Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Liu,

Sun,

Zhang

et al. 2024

J. Am. Chem. Soc.

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ABO 3 -type perovskite relaxor ferroelectrics (RFEs) have emerged as the preferred option for dielectric capacitive energy storage. However, the compositional design of RFEs with high energy density and efficiency poses significant challenges owing to the vast compositional space and the absence of general rules. Here, we present an atomic-level chemical framework that captures inherent characteristics in terms of radius and ferroelectric activity of ions. By categorizing A/B-site ions as host framework, rattling, ferroelectrically active, and blocking ions and assembling these four types of ions with specific criteria, linear-like relaxors with weak locally correlated and highly extendable unit-cell polarization vectors can be constructed. As example, we demonstrate two new compositions of Bi 0.5 K 0.5 TiO 3 -based and BaTiO 3 -based relaxors, showing extremely high recoverable energy densities of 17.3 and 12.1 J cm −3 , respectively, both with a high efficiency of about 90%. Further, the role of different types of ions in forming heterogeneous polar structures is identified through element-specific local structure analysis using neutron total scattering combined with reverse Monte Carlo modeling. Our work not only opens up new avenues toward rational compositional design of high energy storage performance lead-free RFEs but also sheds light on atomic-level manipulation of functional properties in compositionally complex ferroelectrics.

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Section: Resultsmentioning

confidence: 95%

“…A significant frequency-dependent dielectric maximum is observed, with ΔT max being 90 K for BKT-D1, and 70 K for BT-D2, indicating the presence of small size and weakly coupled polar nanoregions. 43,44 These relaxor features will be beneficial to the high-field energy storage performance.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Liu,

Sun,

Zhang

et al. 2024

J. Am. Chem. Soc.

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“…It should be noted that this electric field of relaxor to ferroelectric phase transition is larger than the reported BNT-based ergodic phase that can induced long-range ferroelectric domain. 45 The large P 2 of 0.1CBTZ indicates a harder field -induced phase transition from relaxor to ferroelectric phase. In contrast, the electric field of P 1 decreases from 15 kV/cm to close to 0 kV/cm for x = 0.06 and 0.1, indicating an easier recovery of ferroelectric phase.…”

Section: Resultsmentioning

confidence: 99%

Enhanced High Temperature Stability of BNT-BKT-CBTZ Lead-Free Dielectrics

Zhao

Liu

Shi

et al. 2019

ECS J. Solid State Sci. Technol.

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(0.8-x)Bi0.5Na0.5TiO3−0.2K0.5Bi0.5TiO3−xCa0.7Bi0.2Ti0.9Zr0.1O3 (BNT-BKT-CBTZ) ceramics are prepared by a solid-state sintering method to investigate the influence of CBTZ with A-site vacancies on the high-temperature dielectric stability. XRD patterns reveal that all compositions show pure perovskite structure without any apparent secondary phase. The addition of CBTZ effectively suppresses the dielectric anomaly peak at maximum temperature (Tm) which forms a flatter dielectric platform especially that for x = 0.1, permittivity is 1606 ± 15% in a wide temperature range from 84°C to 417°C with a low dielectric loss (<0.02) from 120°C to 393°C. The ceramics exhibit insulative nature and the activation energy (Ea) of grain conductivity calculated from Z*(f) that follows Arrhenius law is of ∼1.73 eV. With increasing the CBTZ content, BNT-BKT-CBTZ transforms from ferroelectric to relaxor state and the ferroelectric macrodomains miniaturize to randomly oriented polar nanoregions (PNRs). For BNT-BKT-0.1CBTZ, high temperature PNRs arise at lower temperature which leads to enhanced inducing electric field for relaxor to ferroelectric phase transition and temperature-stable relaxor behavior.

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“…The Raman modes below ~ 150 cm −1 are related to the Bi 3+ vibrations [36]. The Raman modes between 200 -380 cm −1 are thought to be contributed by the Ti-O vibration [15,44]. Raman modes between 500 -650 cm −1 are dominated by Ti-O 6 octahedral vibrations [44,45].…”

Section: Phase Evolution and Raman Analysismentioning

confidence: 99%

“…The BKT is a perovskite ferroelectric material with a relatively higher Curie temperature (T c = 380°C) [10][11][12] than other perovskite-based materials such as BNT and BT [13]. Furthermore, BKT is one of the rare lead-free perovskites which crystallizes in a tetragonal symmetry at room temperature (RT) [14,15], while most of others are in rhombohedral phase. It has been reported that BKT can potentially form a rhombohedral-tetragonal MPB with many other leadfree compositions [13].…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting, electrical, and magnetic properties of potassium bismuth titanate-based lead-free ceramics

Jaita

Jarupoom

Sweatman

et al. 2021

Journal of Asian Ceramic Societies

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In this research, the properties of bismuth potassium titanate modified by bismuth nickel titanate ceramics were investigated. XRD showed that all ceramics exhibited a single perovskite structure. The crystal structure changed from a tetragonal to a cubic phase with increasing modifier content. Average grain size decreased while the bulk density and hardness increased with the modifier. The improvement of mechanical properties was related to the change in microstructural and density. The 5 -10 mol% ceramics showed the good electrical properties. The maximum dielectric properties (ε′ = 1763, tan δ = 0.0697) were obtained for the 10 mol% ceramic. The highest piezoelectric voltage constant (g 33 = 23.92 × 10 −3 Vm/N) and the offresonance figure of merit (FoM) for energy harvesting (~ 6.64 pm 2 /N) were obtained for the 5 mol% ceramic, which was ~ 5.0 times (or 399%) as compared to the pure BKT ceramic. The additive also produced an improvement in the magnetization-magnetic field hysteresis loop. The obtained results suggested that the additive not only enhanced the mechanical properties but also improved the ferroelectric, magnetic, and energy harvesting performances of the studied ceramics.

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Bi_0.5K_0.5TiO₃–CaTiO₃ ceramics: Appearance of the pseudocubic structure and ferroelectric‐relaxor transition characters

Cited by 26 publications

References 45 publications

Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Enhanced High Temperature Stability of BNT-BKT-CBTZ Lead-Free Dielectrics

Energy harvesting, electrical, and magnetic properties of potassium bismuth titanate-based lead-free ceramics

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