Ferroelectric‒to‒relaxor crossover in KNN‒based lead‒free piezoceramics

Duong, Trang An; Erkinov, Farrukh; Aripova, M. Kh.; Ahn, Chang Won; Kim, Byeong Woo; Han, Hongliang; Lee, Jae‐Shin

doi:10.1016/j.ceramint.2020.10.066

Cited by 20 publications

(9 citation statements)

References 68 publications

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“…[356][357][358] KNN-based relaxors have recently come into light with the discovery of significant electrostrain as well as electrostrictive coefficients in heavily doped compositions. Solid solutions of KNN with multivalent oxides such as (Ba 0.5 Sr 0.5 )TiO 3 , [359] Bi(Ni 2/3 Nb 1/2 )O 3 , [360] BaZrO 3 , [361] SrZrO 3 , [362] Ba(Zn 1/3 Nb 2/3 )O 3 , [363] etc., have been shown to display relaxor behavior. Liu et al utilized a more complex composition (KNNSb-BaZrO 3 -(Bi, Na)HfO 3 -Mn) to create a local structural disorder.…”

Section: Local Structural Heterogeneitymentioning

confidence: 99%

“…It is obvious that the improvement of piezoelectric response in lead-free electroceramics by inducing local structural heterogeneity and relaxor behavior is one of the most attractive strategies and is a subject of huge interest these days. [30,123,360,361,367] In the following sections, we highlight other emerging mechanisms which can be individually or synergistically used with conventional mechanism to enhance piezoelectric response in lead-free piezoelectrics.…”

Section: Slush Polar Statementioning

confidence: 99%

See 1 more Smart Citation

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Waqar

Chen

et al. 2021

Advanced Materials

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for piezoelectric devices was estimated to be worth $25.1 billion with a projected compounded annual growth rate (CAGR) of 6.2%. [6] However, the development of piezoelectrics took more than a century to evolve from quartz, which is among the first known piezoelectric materials, [7,8] to their current forms in the modern era. The evolution of piezoelectrics is, hence, rich with the exciting discoveries in fundamental physics, paving the way to the development of applications that changed the course of history. One such example is the invention of sonar by Paul Langevin and team in 1917 [9] which is still essentially implemented today for underwater acoustics and navigation. Later, the discovery of ferroelectricity in BaTiO 3 polycrystal in 1946 [10,11] and phase transition (now referred to as a morphotropic phase boundary (MPB)) in PbZrO 3 -PbTiO 3 solid solution in 1954 [12] stimulated a worldwide interest in gaining fundamental understanding of electromechanical coupling in ferroelectric materials to develop better and more reliable piezoelectric devices. [13][14][15] By contrast, the research on piezoelectrics in the past two decades has been driven mainly by the environmental and health concerns related to the toxicity of lead, which is a primary constituent of the widely used lead-based piezoelectric ceramics, [16,17] where the best known example is lead zirconium titanates (PZT). Consequently, the stringent regulations all over the world to restrict the use of lead [18] have resulted in the rise of "lead-free" ceramics which further gained popularity after Saito et al.'s discovery of large piezoelectric response in a lead-free piezoceramic. [19] These eco-friendly materials represent now although a relatively small part of the current piezoelectrics market, with a total estimate of around $172 million, but, their sales are projected to reach $443 million by 2024 with a CAGR of 20.8%. [6] ABO 3 -type perovskite oxide ferroelectrics hold great technical value owing to their large spontaneous polarization, which makes them highly suitable for piezoelectric applications. [1,3,20] In recent years, the research efforts have been primarily focused on developing new strategies to produce high-performance lead-free oxide piezoelectrics with properties at least comparable to or surpassing those of the lead-based counterparts, such as PZT. [20] These strategies have mainly Piezoelectric materials are known to mankind for more than a century, with numerous advancements made in both scientific understandings and practical applications. In the last two decades, in particular, the research on piezoelectrics has largely been driven by the constantly changing technological demand, and the drive toward a sustainable society. Hence, environmental-friendly "lead-free piezoelectrics" have emerged in the anticipation of replacing lead-based counterparts with at least comparable performance. However, there are still obstacles to be overcome for realizing this objective, while the efforts in this direction already seem to culminat...

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Section: Local Structural Heterogeneitymentioning

confidence: 99%

Section: Slush Polar Statementioning

confidence: 99%

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Waqar

Chen

et al. 2021

Advanced Materials

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show abstract

“…7(b) and (c)), which was due to the presence of nanodomains because the decrease in θ in NKN-based piezoceramics has been explained by the decrease in the domain size. 47,54,55 However, the 0.02 ≤ x ≤ 0.05 textured compositions still maintained large θ values of 78–81°, indicating that they also have a high poling efficiency. However, when x exceeded 0.05, θ decreased considerably with an increasing x to −74 for the x = 0.1 composition.…”

Section: Resultsmentioning

confidence: 97%

“…In addition, it is well known that the nanodomains are also developed in the piezoceramics with the relaxor properties. 47,54,55 The T O–T of the NK(N 1− x S x )–CZ–BAZ ceramic ( x = 0.0) did not change with increasing frequency (Fig. S9(a), ESI†), indicating that this piezoceramic did not have relaxor properties.…”

Section: Resultsmentioning

confidence: 99%

Optimized physical properties of [001]-textured (Na, K)NbO₃-based lead-free piezoceramics for high power piezoelectric energy harvesters

Chae,

Kim,

Kim

et al. 2024

J. Mater. Chem. C

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“…where ε r is the relative dielectric constant at the temperature (T), γ is the diffusion factor, which can be utilized to evaluate the degree of the diffuseness, C is the CurieWeiss constant, and T m is the temperature of the maximum dielectric constant (ε m ) [8,35]. In general, the γ is expected to be 1 in classical ferroelectrics, while γ = 2 is a sign of an ideal relaxor ferroelectrics [8,31].…”

Section: Resultsmentioning

confidence: 99%

(K,Na)NbO₃-based lead-free ceramics with enhanced temperature-stable piezoelectricity and efficient red luminescence

Liu¹,

Pan²,

Liu³

et al. 2023

Journal of Advanced Ceramics

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There has been a surge of research interest in the promising lead-free potassiumsodium niobate (KNN)-based ceramics, applications of which could be significantly promoted by improving thermal stability of piezoelectricity. Besides, endowing the KNN-based ceramics with photoluminescence property by rare-earth-ion doping can make them more completive lead-free counterparts in potential applications such as novel multifunctional sensing devices. Herein, a novel KNN-based ceramic material doped with Eu was elaborately designed to simultaneously obtain enhanced temperaturestable piezoelectricity and good luminescence property. By the introduction of diffused phase transition and the modulation of unit cell distortion, a large piezoelectric strain coefficient (d * 33 ) with a small variation (590±59 pm/V) over a wide temperature range (from room temperature to 110 ℃) was realized. The optimal composition also exhibited a considerable piezoelectric coefficient (d 33 ) with small fluctuation (330±33 pC/N) from 20 to 80 ℃. In addition to the enhanced temperature-stable piezoelectricity, the luminescence of these ceramics was slightly enhanced with the elevation of BaZrO 3 (BZ) doping contents, which could be attributed to the increased compositional disorder and the decreased unit cell distortion of the matrix material. Moreover, an optical characteristic was more prominent at ultra-low temperatures. This work unprecedentedly provides a novel paradigm for the design of multifunctional KNN-based ceramics with enhanced temperature-stable piezoelectricity and good luminescence property, revealing the great potential of the rare-earth-element-doped KNN material for future applications in the novel multifunctional devices.

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Ferroelectric‒to‒relaxor crossover in KNN‒based lead‒free piezoceramics

Cited by 20 publications

References 68 publications

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Optimized physical properties of [001]-textured (Na, K)NbO₃-based lead-free piezoceramics for high power piezoelectric energy harvesters

(K,Na)NbO₃-based lead-free ceramics with enhanced temperature-stable piezoelectricity and efficient red luminescence

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Ferroelectric‒to‒relaxor crossover in KNN‒based lead‒free piezoceramics

Cited by 20 publications

References 68 publications

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Evolution from Lead‐Based to Lead‐Free Piezoelectrics: Engineering of Lattices, Domains, Boundaries, and Defects Leading to Giant Response

Optimized physical properties of [001]-textured (Na, K)NbO3-based lead-free piezoceramics for high power piezoelectric energy harvesters

(K,Na)NbO3-based lead-free ceramics with enhanced temperature-stable piezoelectricity and efficient red luminescence

Contact Info

Product

Resources

About

Optimized physical properties of [001]-textured (Na, K)NbO₃-based lead-free piezoceramics for high power piezoelectric energy harvesters

(K,Na)NbO₃-based lead-free ceramics with enhanced temperature-stable piezoelectricity and efficient red luminescence