Journal Article10.1039/C8TC06159A
Effects of a phase engineering strategy on the strain properties in KNN-based ceramics
Xiang Lv,Jiagang Wu +1 more
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TL;DR: In this article, a phase engineering strategy (PES) was used to improve the strain properties of KNN-based ceramics, which resulted in an increased diffuseness of ferroelectricity and decreased domain size.
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Abstract: In this work, (0.99 − x)(K0.5Na0.5)(Nb0.965Sb0.035)O3–0.01SrZrO3–x(Bi0.5Na0.5)ZrO3 ceramics were selected to show how a phase engineering strategy (PES) affects the strain properties in potassium sodium niobate (KNN)-based ceramics. The application of PES resulted in the coexistence of multiple phases in KNN-based ceramics accompanied by an increased diffuseness of ferroelectricity and decreased domain size. The strain properties, including the dependencies of strain on composition, temperature and fatigue behavior, were evaluated by considering the phase structure, domain configuration and microstructure. The improved room-temperature strain properties of the KNN-based ceramics with PES originated from the converse piezoelectric response, domain switching and possible electric-induced phase transition, which resulted from the coexistence of multiple phases and complex domain configuration. The enhanced temperature stability mainly originated from the converse piezoelectric response. Endurable fatigue resistance (no degradation within 100–105 electric cycles) and a high electrostriction coefficient (Q33 = 0.035 m4 C−2) were observed in the ceramics with x = 0.03 and 0.05, respectively. This study provides a systematic analysis of the effects of PES on strain properties in KNN-based ceramics.
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Citations
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TL;DR: In this article , a textured NKN-based piezoceramic material for piezoelectric energy harvesters (PEHs) and actuators is presented.
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Large electrostrain with nearly-vanished hysteresis in eco-friendly perovskites by building coexistent glasses near quadruple point
Liqiang He,Dong Wang,Mingjie Xu,Le Zhang,Le Zhang,Le Zhang,Fan Ye,Fan Ye,Ming Wu,Lixue Zhang,Danyang Wang,Xiaoqing Pan,Xiaobing Ren,Xiaobing Ren +13 more
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Low-temperature dielectric relaxation associated with NbO6 octahedron distortion in antimony modified potassium sodium niobate ceramics
TL;DR: In this paper , the effect of Sb on KNN-based ceramics was investigated and it was shown that the optimized piezoelectric properties are the trade-off between the long-range ferroelectric ordering and the local heterogeneity.
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Enhanced strains of Nb-doped BNKT-4ST piezoelectric ceramics via phase boundary and domain design
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TL;DR: In this paper, a strategy that constructs the morphotropic phase boundary and manipulates the domain structure has been used to design the component of 0.96[Bi0.5(Na0.84K0.16)0.04SrTiO3 (BNKT-4ST-100xNb) to enhance the strain properties for actuator application.
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Giant Piezoelectricity in Potassium–Sodium Niobate Lead-Free Ceramics
Xiaopeng Wang,Jiagang Wu,Dingquan Xiao,Jianguo Zhu,Xiaojing Cheng,Ting Zheng,Binyu Zhang,Xiaojie Lou,Xiangjian Wang +8 more
TL;DR: An alkali niobate-based lead-free piezoceramic with the largest d33 of ∼490 pC/N ever reported so far using conventional solid-state method is reported, which may pave the way for "lead-free at last".
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