Superior Piezoelectric Properties in Potassium–Sodium Niobate Lead‐Free Ceramics

Xu, Kai; Li, Jun; Lv, Xiang; Wu, Jiagang; Zhang, Xixiang; Xiao, Dingquan; Zhu, Jianguo

doi:10.1002/adma.201601859

Cited by 635 publications

(349 citation statements)

References 29 publications

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“…As shown in Figure 17, an in vitro intravascular ultrasound (IVUS) image of a human cadaver coronary artery was obtained by such a lead-free transducer with adequate resolution and contrast to differentiate the vessel wall and fibrous plaque. Various studies have also shown potential applications of such BaTiO3-based lead-free ceramics, ranging from energy harvesting to energy storage, which can provide guidelines for the next generation of Pb-free materials with even better piezoelectric properties, for example in high TC KNN based piezoceramics [18,91,92]. …”

Section: Applications and Outlinementioning

confidence: 99%

Recent Progress on BaTiO3-Based Piezoelectric Ceramics for Actuator Applications

et al. 2017

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Due to issues with Pb toxicity, there is an urgent need for high performance Pb-free alternatives to Pb-based piezoelectric ceramics. Although pure BaTiO 3 material exhibits fairly low piezoelectric coefficients, further designing of such a material system greatly enhances the piezoelectric response by means of domain engineering, defects engineering, as well as phase boundary engineering. Especially after the discovery of a Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ba 0.7 Ca 0.3 )TiO 3 system with extraordinarily high piezoelectric properties (d 33 > 600 pC/N), BaTiO 3 -based piezoelectric ceramics are considered as one of the promising Pb-free substitutes. In the present contribution, we summarize the idea of designing high property BaTiO 3 piezoceramic through domain engineering, defect-doping, as well as morphotropic phase boundary (MPB). In spite of its drawback of low Curie temperature, BaTiO 3 -based piezoelectric materials can be considered as an excellent model system for exploring the physics of highly piezoelectric materials. The relevant material design strategy in BaTiO 3 -based materials can provide guidelines for the next generation of Pb-free materials with even better piezoelectric properties that can be anticipated in the near future.

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Section: Applications and Outlinementioning

confidence: 99%

Recent Progress on BaTiO3-Based Piezoelectric Ceramics for Actuator Applications

et al. 2017

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“…Then in 2014, the breakthrough in piezoelectricity (d 33 $ 490 pC/N) was made in (1 À xÞ(K 1Ày Na y Þ(Nb 1Àz Sb z ÞO 3 -xBi 0:5 (Na 1Àw K w Þ 0:5 ZrO 3 system through normal sintering method. Through optimizing the composition of designed KNN system, the R-T phase boundary was constructed and a good comprehensive 87 At the same year, a new material system comprising (1 À x À yÞK 1Àw Na w Nb 1Àz Sb z O 3 -xBiFeO 3 -yBi 0:5 Na 0:5 ZrO 3 was designed to attain a high d 33 of 550 pC/N and a high T C of 237 ○ C through constructing an R-T phase boundary. 88 This work presents the good comprehensive performance of d 33 and T C , which is superior to those of reported KNN-based ceramics regardless of phase boundary types.…”

Section: R-t Phase Boundariesmentioning

confidence: 99%

Progress on the doping and phase boundary design of potassium–sodium niobate lead-free ceramics

Xing

Zheng

et al. 2018

J. Adv. Dielect.

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Potassium-sodium niobate (K,Na)NbO 3 /(KNN) lead-free ceramics have drawn vast amount of attention as one of the effective alternatives to lead-based ones. In recent years, the author's group concentrated their work on KNN-based ceramics. This paper reviews the main obtained results in authors' laboratory on how to enhance the piezoelectric properties of KNN-based ceramics, including the ions or compounds substitution, the constructing and types of phase boundaries near room temperature, the investigation of other tools (sintering aids, synthesis technique, poling conditions) on properties. All the published papers up to now show the developing higher performance with maintaining high Curie temperature of KNN-based ceramics which has great potential for the future and is the key to success for the field.

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“…[1] Particularly, the construction of new phase boundary by simultaneously shifting the rhombohedral-orthorhombic and orthorhombic-tetragonal phase transition temperature (e.g., T R-O and T O-T ) toward room temperature proved to enhance the piezoelectric properties of KNN-based ceramics. [1,7] Although the improved piezoelectricity can be guaranteed by means of phase boundaries, the related electrical properties still exhibited the strong temperature dependence due to the nature of polymorphic phase boundary that is different from the morphotropic phase boundary in PZT-based ceramics. [1,2,4,5] More importantly, the systematical investigations on how the phase boundaries affected the strain and its temperature stability is still missing, which could further promote the understanding of KNNbased ceramics.…”

mentioning

confidence: 99%

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Xiao

et al. 2018

Adv Elect Materials

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Particularly, unipolar strain and its temperature stability comparable to those of soft PZT-4 ceramics were reported in textured (K 0.44 Na 0.52 Li 0.04 )(Nb 0.84 Ta 0.10 Sb 0.06 )O 3 (LF4T) ceramics synthesized by the reactive template grain growth (RTGG) method. [6] Subsequent investigations focused on the improvement of both unipolar strain and its temperature stability using conventional sintering method due to high cost of RTGG. Vast studies strongly proved that phase boundary is an effective way to improve strain properties of KNN-based ceramics. [1] Particularly, the construction of new phase boundary by simultaneously shifting the rhombohedral-orthorhombic and orthorhombic-tetragonal phase transition temperature (e.g., T R-O and T O-T ) toward room temperature proved to enhance the piezoelectric properties of KNN-based ceramics. [1,7] Although the improved piezoelectricity can be guaranteed by means of phase boundaries, the related electrical properties still exhibited the strong temperature dependence due to the nature of polymorphic phase boundary that is different from the morphotropic phase boundary in PZT-based ceramics. [1,2,4,5] More importantly, the systematical investigations on how the phase boundaries affected the strain and its temperature stability is still missing, which could further promote the understanding of KNNbased ceramics.Recently, the temperature-insensitive dielectric properties were reported in SrZrO 3 -modified KNN-based ceramics, accompanying with small permittivity variation of ±15% (−65 to 201 °C). [8] Here, (0.99-x)(K 0.5 Na 0.5 )(Nb 0.965 Sb 0.035 )O 3 -0.01SrZrO 3 -x(Bi 0.5 Na 0.5 )ZrO 3 (x = 0-0.05) ceramics were chosen as an example to illustrate the effects of phase boundaries on the strain and its temperature stability. Through the study of temperature-dependent unipolar strain at different phase boundaries and similar phase boundary with different locations, effects of phase boundaries on strain and its temperature stability were illustrated. More importantly, the improved temperature stability of unipolar strain (S uni ) was observed in the ceramics (x = 0.03), e.g., high retention (≈95%) of S uni at T = 180 °C and low variation of 24% at T = 20-180 °C. The related physical mechanisms were discussed in detail. Results and DiscussionA typical perovskite structure without any other secondary phases was found in all samples ( Figure S1, Supporting Information).

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Superior Piezoelectric Properties in Potassium–Sodium Niobate Lead‐Free Ceramics

Cited by 635 publications

References 29 publications

Recent Progress on BaTiO3-Based Piezoelectric Ceramics for Actuator Applications

Recent Progress on BaTiO3-Based Piezoelectric Ceramics for Actuator Applications

Progress on the doping and phase boundary design of potassium–sodium niobate lead-free ceramics

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

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Superior Piezoelectric Properties in Potassium–Sodium Niobate Lead‐Free Ceramics

Cited by 635 publications

References 29 publications

Recent Progress on BaTiO3-Based Piezoelectric Ceramics for Actuator Applications

Recent Progress on BaTiO3-Based Piezoelectric Ceramics for Actuator Applications

Progress on the doping and phase boundary design of potassium–sodium niobate lead-free ceramics

Modifying Temperature Stability of (K,Na)NbO3 Ceramics through Phase Boundary

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Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary