Composition-insensitive enhanced piezoelectric properties in SrZrO3 modified (K, Na)NbO3-based lead-free ceramics

Zhou, Jing; Xiang, Guanglei; Shen, Jie; Zhang, Huazhang; Xu, Zhangmancang; Li, Hang; Ma, Peiyu; Chen, Wen

doi:10.1007/s10832-019-00195-2

Cited by 13 publications

(7 citation statements)

References 31 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%

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%

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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“…In this range, the (200) peak intensity keeps increasing, implying the transition of the O-to-T phase. With a further increase in the temperature range to 240 °C, the T phase becomes dominant as evident from the intensity value of I (002) / I (200) ∼ 0.78 (Figure S9) given by , α ortho = [ false( I 011 / I 100 false) + false( I 022 / I 200 false) ] / 2 0.25em ( O symmetry ∼ 1.85 ) α tetra = [ false( I 001 / I 010 false) + false( I 002 / I 020 false) ] / 2 0.25em ( T symmetry ∼ 0.53 ) …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Textured Lead-Free Piezoelectric Ceramics for Flexible Energy Harvesters

Purusothaman

Leng

Nanda

et al. 2023

ACS Appl. Mater. Interfaces

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A lead-free (K,Na)NbO3-based piezoelectric ceramic is textured along the (001) direction using the NaNbO3 (NN) seeds. The composition 0.96(K0.5Na0.5)(Nb0.965Sb0.035)O3–0.01CaZrO3–0.03(Bi0.5K0.5)HfO3 (KNN) is found to provide an excellent combination of electromechanical coefficients at room temperature. The textured composition with 5 wt % NN template (KNN-5NN) exhibits considerably improved electromechanical coefficients, d 33 ∼ 590 pC/N, k 31 ∼ 0.46, and d 31 ∼ 215 ×10–12 C/N, at room temperature. A flexible piezoelectric energy harvester (F-PEH) is fabricated using the textured KNN-5NN ceramic and tested under cyclic force. F-PEH exhibits enhanced output voltage (V oc ∼ 25 V), current (I ∼ 0.4 μA), and power density (P D ∼ 5.5 mW/m2) (R L of 10 MΩ) in the off-resonance frequency regime. In comparison to the random ceramic KNN-0NN-based F-PEH (V oc ∼ 8 V and I ∼ 0.1 μA), the textured F-PEH significantly outperformed energy harvesting capability due to the large figure-of-merit value (d 31 × g 31) ∼ 3354 ×10–15 m3/J. This work provides a methodology for texturing lead-free materials and further implementing them in flexible energy harvesting devices and sensors.

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“…Generally, large and typical ferroelectric domains provide strong ferroelectricity, whereas smaller domains are easier to switch under an external electric field and thus can make a greater extrinsic contribution to the piezoelectric properties 31,35 . However, if the proportion of nanodomains is too high, the ferroelectricity degenerates, and the piezoelectric performance after DC polarization is difficult to maintain for an extended period, which shortens the service life and damages the electric‐field‐induced strain 37 . Therefore, the synergistic effect of large and small ferroelectric domains maintains a better balance between ferroelectricity and relaxation of materials, resulting in excellent inverse piezoelectric properties in 0.08SZT and 0.09SZT samples.…”

Section: Resultsmentioning

confidence: 99%

“…31,35 However, if the proportion of nanodomains is too high, the ferroelectricity degenerates, and the piezoelectric performance after DC polarization is difficult to maintain for an extended period, which shortens the service life and damages the electric-field-induced strain. 37 Therefore, the synergistic effect of large and small ferroelectric domains maintains a better balance between ferroelectricity and relaxation of materials, resulting in excellent inverse piezoelectric properties in 0.08SZT and 0.09SZT samples.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh electric‐field‐induced strain in KNN‐based piezoelectric ceramics sintered in reducing atmosphere

et al. 2022

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With the goals of sustainable development adopted by more and more nations, the lead-free trend of multilayer ceramic actuators has become a widely recognized consensus. Sintering in a reducing atmosphere is a necessary approach for preparing lead-free ceramics co-fired with low-cost nickel internal electrodes. Herein, (1 − x)K 0.48 Na 0.52 Nb 0.96 Ta 0.04 O 3 -xSr(Zr 0.5 Ti 0.5 )O 3 + 0.03ZrO 2 + 0.08MnO 2 (KNNT-SZT) ceramics were sintered in a reducing atmosphere using a solid-state reaction. The Sr(Zr 0.5 Ti 0.5 )O 3 (SZT) dopant decreased the Curie temperature T C and the O-T phase transition temperature. The enhanced diffuseness of the ferroelectric phase transition of KNNT-SZT ceramics is attributed to the element doping and the locally inhomogeneous microstructure. High inverse piezoelectric coefficients d 33 * of 883 and 787 pm/V were obtained for the 8-and 9-mol% SZT-doped samples, respectively. These results were attributed to the synergistic effect of ferroelectric domains with different sizes. The diffused O-T phase transition significantly improved the piezoelectric temperature stability of the 9-mol% SZT-doped sample, whose electric-field-induced strain decreased by <10% from room temperature (25 • C) to 115 • C. The cyclic fatigue test showed that >98% of the initial d 33 * was retained after 10 6 cycles of unipolar electrical loading.The KNNT-SZT ceramics sintered in a reducing atmosphere possessed excellent inverse piezoelectric properties and are expected to be applied in the field of multilayer ceramic piezoelectric actuators with base metal internal electrodes.

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Composition-insensitive enhanced piezoelectric properties in SrZrO3 modified (K, Na)NbO3-based lead-free ceramics

Cited by 13 publications

References 31 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

Textured Lead-Free Piezoelectric Ceramics for Flexible Energy Harvesters

Ultrahigh electric‐field‐induced strain in KNN‐based piezoelectric ceramics sintered in reducing atmosphere

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