Journal ArticleDOI
Polymorphic phase transition and excellent piezoelectric performance of (K0.55Na0.45)0.965Li0.035Nb0.80Ta0.20O3 lead-free ceramics
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TLDR
A lead-free ceramic with the composition (K0.55Na0.45)0.965Li0.035Nb0.80Ta0.20O3 was found having an outstanding piezoelectric performance.Abstract:
A lead-free ceramic with the composition (K0.55Na0.45)0.965Li0.035Nb0.80Ta0.20O3 was found having an outstanding piezoelectric performance. It possesses high piezoelectric properties of d33=262 pC/N, kp=0.53, k33=0.63, and k31=0.31 with e′=1290 and tan δ=0.019 at room temperature. In spite of the orthorhombic-tetragonal polymorphic phase transition around 30 °C, temperature stability of the electromechanical coupling coefficients is very good over the common usage temperature interval between −40 and 85 °C. Furthermore, the piezoelectric properties remain almost unchanged in the severe thermal aging test down to −150 °C and up to about 300 °C. It is suggested that the outstanding piezoelectric performance of this ceramic can be largely ascribed to the phase coexistence in a wide temperature range and the Ta-rich composition.read more
Citations
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Potassium-sodium niobate lead-free piezoelectric materials: past, present, and future of phase boundaries.
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(K, Na)NbO3-Based Lead-Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges
TL;DR: A comprehensive review on the latest development of KNN-based piezoelectric ceramics is presented in this paper, including phase structure, property enhancement approaches, and sintering processes as well as the status of some promising applications.
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Recent development in lead-free perovskite piezoelectric bulk materials
TL;DR: In this paper, the authors highlighted the compelling physical properties of lead-free piezoelectric perovskite materials and summarized their state-of-the-art progress.
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Progress in high-strain perovskite piezoelectric ceramics
TL;DR: A comprehensive review of the latest developments of the various types of perovskite piezoelectric ceramic systems is presented in this article, with special attention given to three promising families of lead-free perovsite ferroelectrics: the barium titanate, alkaline niobate and bismuth pervskites.
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Lead-free piezoceramics – Where to move on?
Chang-Hyo Hong,Hwang-Pill Kim,Byung-Yul Choi,Hyoung-Su Han,Jae Sung Son,Chang Won Ahn,Wook Jo +6 more
TL;DR: In this paper, a review of the history of lead-free piezoceramics can be found, which can be used to understand the interests and demands of industry side as well as to provide the industry with new scientific insights that would eventually lead to new applications.
References
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Journal ArticleDOI
Lead-free piezoceramics
Yasuyoshi Saito,Hisaaki Takao,Toshihiko Tani,Tatsuhiko Nonoyama,Kazumasa Takatori,Takahiko Homma,Toshiatsu Nagaya,Masaya Nakamura +7 more
TL;DR: A lead-free piezoelectric ceramic with an electric-field-induced strain comparable to typical actuator-grade PZT is reported, achieved through the combination of the discovery of a morphotropic phase boundary in an alkaline niobate-based perovskite solid solution, and the development of a processing route leading to highly textured polycrystals.
Journal ArticleDOI
Phase transitional behavior and piezoelectric properties of (Na0.5K0.5)NbO3–LiNbO3 ceramics
TL;DR: In this article, a morphotropic phase boundary between orthorhombic and tetragonal phases is found in the composition range 0.05
Journal ArticleDOI
Piezoelectric properties of Li- and Ta-modified (K0.5Na0.5)NbO3 ceramics
TL;DR: Guo et al. as discussed by the authors showed that high densities and piezoelectric properties can be obtained for all compositions by pressureless sintering in air, without cold isostatic pressing, and without any sinterings aid or special powder treatment.
Journal ArticleDOI
Direct evaluation of domain‐wall and intrinsic contributions to the dielectric and piezoelectric response and their temperature dependence on lead zirconate‐titanate ceramics
TL;DR: In this paper, an experimental method is introduced to directly and quantitatively determine the domain-wall and intrinsic contributions to the piezoelectric and dielectric responses of a ferroelectric material.
Journal ArticleDOI
Piezoelectric properties in perovskite 0.948(K0.5Na0.5)NbO3–0.052LiSbO3 lead-free ceramics
TL;DR: In this article, a lead-free piezoelectric ceramics, with the nominal composition of 0.948(K 0.5Na0.5)NbO3-0.052LiSbO 3 (KNN-LS5.2), were synthesized by conventional solid-state sintering, and the pieziolectric and electromechanical properties were characterized as a function of temperature, which mimicked the compositional variation seen in the proximity of a morphotropic phase boundary.