Compositionally Graded KNN‐Based Multilayer Composite with Excellent Piezoelectric Temperature Stability

Zheng, Ting; Yu, Yungang; Lei, Haobin; Li, Fēi; Zhang, Shujun; Zhu, Jianguo; Wu, Jiagang

doi:10.1002/adma.202109175

Cited by 82 publications

(68 citation statements)

References 48 publications

(54 reference statements)

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“…[ 30 ] Recently, Zheng et al proposed using a 2‐2 type multilayers composite heterostructure with gradient chemical compositions to induce a diffused phase transition in KNN‐based ceramics to achieve enhanced thermal stability. [ 31 ] We think the strategy is very similar to the one in this work, but the heterostructure constructed herein is a 0–3 type core–shell structure. In the strategy proposed by Zheng et al, layers of multiple compositions have to be selected and stacked together.…”

Section: Resultsmentioning

confidence: 93%

Domain Engineering in Bulk Ferroelectric Ceramics via Mesoscopic Chemical Inhomogeneity

Thong

et al. 2022

Advanced Science

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Domain engineering in ferroelectrics endows flexibility for different functional applications. Whereas the domain engineering strategy for single crystals and thin films is diverse, there is only a limited number of strategies for bulk ceramics. Here, a domain engineering strategy for achieving a compact domain architecture with increased domain‐wall density in (K,Na)NbO3 (KNN)‐based ferroelectric ceramics via mesoscopic chemical inhomogeneity (MCI) is developed. The MCI‐induced interfaces can effectively hinder domain continuity and modify the domain configuration. Besides, the MCI effect also results in diffused phase transitions, which is beneficial for achieving enhanced thermal stability. Modulation of chemical inhomogeneity demonstrates great potential for engineering desirable domain configuration and properties in ferroelectric ceramics. Additionally, the MCI can be easily controlled by regulating the processing condition during solid‐state synthesis, which is advantageous to industrial production.

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Section: Resultsmentioning

confidence: 93%

Domain Engineering in Bulk Ferroelectric Ceramics via Mesoscopic Chemical Inhomogeneity

Thong

et al. 2022

Advanced Science

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“…KNN single crystal is in an orthonormal phase, as shown in Figure d 1 . The high pyroelectric current peak appears at 193 °C because of the KNN single crystals from the orthorhombic phase to the tetragonal phase . As shown in Figure d 2 , the domain structure of the KNN single crystal changes with the increase in temperature.…”

Section: Results and Discussionmentioning

confidence: 94%

High Open-Circuit Voltage of a Pyroelectric Energy Harvester Based on KNN Single Crystals

Zhang

Tian

Huang

et al. 2022

Crystal Growth & Design

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Pyroelectric materials have promising applications in small generators and energy harvesters, which play the role of converting thermal energy into electricity. In particular, the opencircuit voltage is closely related to the efficiency of energy harvesting. Therefore, it is necessary to prepare pyroelectric materials with high open circuit voltage. In this work, a high opencircuit voltage of a pyroelectric energy harvester based on KNN single crystals is grown by the top-seeded solution-growth method. The open-circuit voltage of KNN single crystals is as high as 47 V. Meanwhile, the pyroelectric open-circuit voltage remains almost 90% after 50 cycles, which exhibited excellent cycle reversibility. Also, the pyroelectric coefficient of KNN single crystals can reach 9.1 × 10 4 μC•m −2 •K −1 at orthogonal−tetragonal phase transition. We also revealed the reason for the open-circuit voltage of KNN single crystals is that the motion of the domain walls and the drastic change of spontaneous polarization during the O−T phase transition lead to the enhancement of the pyroelectric coefficient by Raman spectroscopy. Furthermore, the designed energy harvester exhibits a power density of up to 773.7 mW•m −3 . Therefore, this work provides a potential material for waste heat harvesting. This is essential to resolve the contradiction between thermal energy loss and energy and to collect and reuse the lost thermal energy.

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“…36 Inspired by the favorable temperature stability of d 33 in the NPB-featured KNN-based ceramics and the enhanced d 33 values at the ferroelectric−ferroelectric phase transition (e.g., T O−T ), our group proposed to integrate KNN-based ceramics with different T O−T values into one sample for obtaining a successive phase transition over a wide temperature range, by which we expected both large d 33 and good temperature stability, as shown in Figure 5k. 37 We chose a (1 − x)(K 0.48 Na 0.52 )(Nb 0.955 Sb 0.045 )-O 3 −xBi 0.5 Na 0.5 ZrO 3 −0.2%Fe 2 O 3 (KNNS−xBNZ−Fe, x = 0.01, 0.02, 0.03, 0.04) ceramic system to fabricate the compositionally graded multilayer composite because of the gradually reduced T O−T with increasing x. KNNS−xBNZ−Fe ceramics with x = 0.01−0.04 are abbreviated as ingredients I−IV for convenience. Note that ingredient IV has a large d 33 of 520 pC/N because of owing the NPB.…”

Section: Temperature Stability In Npb-featured Knn-based Ceramicsmentioning

confidence: 99%

Multiscale Structure Engineering for High-Performance Pb-Free Piezoceramics

Zheng

Zhao

et al. 2022

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS:The increasing world energy crisis drives humans to harvest the energy in nature as much as possible without heavily damaging the environment. However, most of the energy in nature cannot be used directly. Therefore, pursuing technologies or matter that can directly interconvert different energies has been one of the most cutting-edge fields in science and technology. Such a magic ability exists in true-life piezoelectric materials that generate charge when being given a force and vice versa, rendering them highly promising for energy harvesting and conversion because of the tremendous mechanical energy on the earth, such as tide energy. Thus, piezoelectric materials, represented by the lead zirconate titanate (Pb(Zr, Ti)O 3 , PZT) family, have been largely used in various traditional and burgeoning fields, such as electronic information, biomedical treatment, and wearable flexible electronic devices, and are one of the most important favorites in multidisciplinary fields. However, Pb is highly toxic.Driven by environmental protection and concern for human health, Pb-free piezoceramics are rapidly being developed to hopefully replace Pb-based ones. In particular, the renewal of Restriction of the use of certain Hazardous Substances (e.g., RoHS 2), issued by the European Union, declared that replacement of PZT "...may be scientifically and technologically practical to a certain degree...". Therefore, developing high-performance Pb-free piezoceramics has become more urgent than ever. In this context, some Pb-free piezoceramics, represented by potassium sodium niobate ((K, Na)NbO 3 , KNN), barium titanate (BaTiO 3 , BT), bismuth barium titanate ((Bi, Na)TiO 3 , BNT), and bismuth ferrite (BiFeO 3 , BFO), stand out because of their unique or similar traits. However, several key challenges, including an inferior overall performance compared to Pb-based counterparts and an unclear structure−property relationship from multiscale viewpoints, have severely hindered the development of Pb-free piezoceramics for a long time.Pb-based piezoceramics possess decent performance due to the strategy of phase boundary engineering, which inspired the researchers to pursue it in Pb-free counterparts. In the last 10 years, our group has been aiming at the new phase boundary (NPB) and new physical phenomenon in Pb-free piezoceramics. This Account presents our recent contributions to the development of Pbfree piezoceramics concerning the good performance and emerging phenomenon. First, we introduce the construction of the NPB in KNN-based piezoceramics by emphasizing the role of some key elements (i.e., Bi, Sb, Zr, and Hf). Then, we summarize the effects of the NPB on KNN-and BT-based ceramics and the new physical phenomenon in BNT-based ceramics. The NPB boosts the piezoelectric properties and temperature stability of KNN-and BT-based piezoceramics, comparable to some Pb-based piezoceramics. Combining the NPB and the multilayer ceramics substantially enhances the temperature stability of t...

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Compositionally Graded KNN‐Based Multilayer Composite with Excellent Piezoelectric Temperature Stability

Cited by 82 publications

References 48 publications

Domain Engineering in Bulk Ferroelectric Ceramics via Mesoscopic Chemical Inhomogeneity

Domain Engineering in Bulk Ferroelectric Ceramics via Mesoscopic Chemical Inhomogeneity

High Open-Circuit Voltage of a Pyroelectric Energy Harvester Based on KNN Single Crystals

Multiscale Structure Engineering for High-Performance Pb-Free Piezoceramics

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