Nonstoichiometric effect on dielectric and large-signal electromechanical properties of environmentally friendly BNT-6BT ferroelectric ceramics

Yang, Yule; Jing, Ruiyi; Wang, Juanjuan; Zhang, Leiyang; Huang, Yunyao; Jin, Li

doi:10.1016/j.ceramint.2022.01.323

Cited by 24 publications

(4 citation statements)

References 77 publications

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“…This is accompanied by a single current peak ( P 1 ) within the J‐E curve, characteristic of the NR phase 44,45 . With an increase in doping, there is a notable reduction in P r value, and the hysteresis loop assumes a “girdle” shape 46 . Additionally, double current peaks ( P 2 and P 3 ) emerge in the J‐E curves.…”

Section: Resultsmentioning

confidence: 99%

“…44,45 With an increase in doping, there is a notable reduction in P r value, and the hysteresis loop assumes a "girdle" shape. 46 Additionally, double current peaks (P 2 and P 3 ) emerge in the J-E curves. These changes can be attributed to the disruption of long-range ferroelectric ordering, decomposition reaction of ferroelectric domains, weakening of ferroelectric properties, and enhancement of the relaxor properties, 47,48 and at this time, the double peaks are the manifestation of the coexistence of ER phase and NR phase.…”

Section: Resultsmentioning

confidence: 99%

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Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn_0.70Nb_0.24)O₃ addition

Zheng,

Nie,

Feng

et al. 2024

J Am Ceram Soc.

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In the current study, the incorporation of Ba(Sn0.70Nb0.24)O3 (BSN) effectively modifies the phase boundary of the 0.8(Bi0.50Na0.50)TiO3‐0.2(Bi0.50K0.50)TiO3 (BNKT) lead‐free ceramic material, inducing enhanced electrostrain properties at room temperature, particularly results in a “bud‐like” strain profile without negative strain. A comprehensive investigation has been conducted into the microstructure, electrical properties, and electrostrain properties of the above‐mentioned ceramics. The addition of BSN was observed to be well incorporated into the BNKT crystal structure, forming a single perovskite structure according to the X‐ray diffraction pattern. With the increase in BSN solid solution content, the temperature at which the transition from ferroelectric to the relaxor phase occurs shifted from 88.1°C to beneath room temperature (30°C). Specifically, the BNKT‐0.0075BSN ceramic demonstrated a positive strain response of 0.459% along with a large signal piezoelectric coefficient (d33*) of 643 pm/V. Additionally, the strain hysteresis of the BNKT‐0.0175BSN ceramics was only about 3% at 120°C. These experimental findings suggest that BNKT‐xBSN ceramics could be strong contenders for actuators and sensors, presenting promising opportunities for lead‐free ceramic actuator applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn_0.70Nb_0.24)O₃ addition

Zheng,

Nie,

Feng

et al. 2024

J Am Ceram Soc.

Self Cite

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“…However, the original non-ergodic relaxor (NR) state in this PB region is irreversibly shifted to a ferroelectric state under the application of electric fields, which leads to the achieved electro-strain values often accompanying by large negative strains (negative strain over 0.2%) [30,31]. Further, by adding orthorhombic KNN to the BNT-0.06BT system, the canonical NR state was disrupted and changed into an ergodic relaxor (ER) state [32].…”

Section: J U S T a C C E P T E Dmentioning

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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“…Furthermore, the double-shell structured fillers fabricated in this work efficiently realizes the possibility of high 𝜖′ and low loss in Zn-3/PVDF, facilitating the IP and enhancing both interparticle polarization and intraparticle polarization of composites as compared to the neat Zn/PVDF investigated previously. [26,[37][38][39][40][41][42][43] Thus, by carefully controlling the shell thickness and choosing an appropriate coating ratio, the dielectric properties of a composite can be optimized as a result, enabling the achievement of the best dielectric performances.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Core@Double–Shell Engineering of Zn Particles toward Elevated Dielectric Properties: Multiple Polarization Mechanisms in Zn@Znch@PS/PVDF Composites

Zhang,

Zhou,

Peng

et al. 2023

Macromol. Rapid Commun.

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Flexible dielectrics with large dielectric constant (ε′) coupled with low loss are highly pursued in many applications. To bolster the ε′ of raw Zn (zinc)/poly(vinylidene fluoride, PVDF) while maintaining pimping dielectric loss, in this study, the core@double–shell structured Zn@zinc carbonate (ZnCH)@polystyrene (PS) particles are first synthesized through a suspension polymerization of styrene, and then composited with PVDF to elevate the ε′ and keep low loss of the composites. By optimizing the PS shells’ thickness and tailoring the electrical resistivity of Zn@ZnCH@PS particles, both the slow inter‐particle polarization and fast intra‐particle polarization in the composites can be decoupled and synergistically tuned, thus, the Zn@ZnCH@PS/PVDF achieves a much higher ε′ and lower dielectric loss, simultaneously, which far exceed the unmodified Zn/PVDF. Both experiment and theoretic calculation reveal that the double‐shell ZnCH@PS not only induces and promotes multiple polarizations enhancing the composites’ ε′, especially at the optimized PS's thickness, but also maintains suppressed loss and conductivity thanks to their obvious barrier effect on long‐range charge migration. The core@double–shell filler design strategy facilitates the development of polymer composites with desirable dielectric properties for applications in electronic and electrical power systems.

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Nonstoichiometric effect on dielectric and large-signal electromechanical properties of environmentally friendly BNT-6BT ferroelectric ceramics

Cited by 24 publications

References 77 publications

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn_0.70Nb_0.24)O₃ addition

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn_0.70Nb_0.24)O₃ addition

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

Core@Double–Shell Engineering of Zn Particles toward Elevated Dielectric Properties: Multiple Polarization Mechanisms in Zn@Znch@PS/PVDF Composites

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Nonstoichiometric effect on dielectric and large-signal electromechanical properties of environmentally friendly BNT-6BT ferroelectric ceramics

Cited by 24 publications

References 77 publications

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn0.70Nb0.24)O3 addition

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn0.70Nb0.24)O3 addition

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

Core@Double–Shell Engineering of Zn Particles toward Elevated Dielectric Properties: Multiple Polarization Mechanisms in Zn@Znch@PS/PVDF Composites

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Product

Resources

About

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn_0.70Nb_0.24)O₃ addition

Large electrostrain achieved in BNKT‐based ceramics by the adjustment of phase boundary with Ba(Sn_0.70Nb_0.24)O₃ addition