Requirements for the transfer of lead-free piezoceramics into application

Koruza, Jurij; Bell, Andrew J.; Frömling, Till; Webber, Kyle G.; Wang, Ke; Rödel, Jürgen

doi:10.1016/j.jmat.2018.02.001

Cited by 205 publications

(113 citation statements)

References 119 publications

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“…As we know, the in situ temperature stability of small‐signal d 33 is one of the most important factors for sensor applications . Due to the lack of apparatus, most measurements in previous references are ex situ, which are generally regarded as thermal stability .…”

Section: Resultsmentioning

confidence: 99%

Temperature‐insensitive piezoelectricity in lead‐free NaNbO₃‐based ceramics

Chen

2018

J Am Ceram Soc

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In this work, we report a lead‐free piezoelectric ceramic of (0.9‐x)NaNbO3‐0.1BaTiO3‐xBaZrO3, and the effects of BaZrO3 on the phase structure, microstructure, electrical properties and temperature stability are investigated. A morphotropic phase boundary‐like region consisting of rhombohedral (R) and tetragonal (T) phases is constructed in the compositions with x = 0.035‐0.04. More importantly, in situ temperature independence of the piezoelectric effect {piezoelectric constant (d33) and strain} can be achieved below the Curie temperature (Tc). Intriguingly, the electric field‐induced strain is still observed at T ≥ Tc due to the combined actions of the electrostrictive effect and the electric field‐induced phase transition. We believe that NaNbO3‐based ceramics of this type have potential for applications in actuators and sensors.

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Section: Resultsmentioning

confidence: 99%

Temperature‐insensitive piezoelectricity in lead‐free NaNbO₃‐based ceramics

Chen

2018

J Am Ceram Soc

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“…Reports about the mechanical properties, especially the fracture toughness of lead‐free piezoceramics are surprisingly rare . This is even more remarkable, as it is not only scientifically intriguing but also an important application‐oriented figure of merit . Recently, the fracture behavior of the solid solution of NBT and BaTiO 3 (BT) was investigated more closely .…”

Section: Introductionmentioning

confidence: 99%

Crack‐tip toughness of lead‐free (1−x)(Na_1/2Bi_1/2)TiO₃–xBaTiO₃ piezoceramics

2018

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Crack opening displacements were evaluated on semi‐elliptical indentation cracks in lead‐free (1−x)(Na1/2Bi1/2)TiO3–xBaTiO3 piezoceramics and a commercially available PZT ceramic. The observed crack‐tip toughness of NBT‐xBT was found to be substantially higher than for PZT. Two evaluations for the crack opening displacement were demonstrated and contrasted: A more elaborate three‐term‐approximation and a pragmatic utilization of the Irwin parabola.

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“…[15][16][17] However, there is current legislation enacted in most of Western countries that bans the use of lead (Pb) due to its toxicity and harmful environmental impact. [20][21][22] Fortunately, recent encouraging results have demonstrated that some of lead-free piezoelectric materials are beginning to approach PZT in performance. [20][21][22] Fortunately, recent encouraging results have demonstrated that some of lead-free piezoelectric materials are beginning to approach PZT in performance.…”

mentioning

confidence: 99%

“…[18][19][20][21][22] The lack of viable alternatives has led to continuing exemptions to allow its use in specific applications, including piezoelectric sensors and actuators. [20][21][22][23][24][25] The material systems that display the highest electromechanical coupling efficiencies are those with perovskite crystal structure. [20][21][22][23][24][25] The material systems that display the highest electromechanical coupling efficiencies are those with perovskite crystal structure.…”

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confidence: 99%

Lead‐Free Bi_0.5(Na_0.78K_0.22)TiO₃ Nanoparticle Filler–Elastomeric Composite Films for Paper‐Based Flexible Power Generators

Won

Kawahara

Ahn

et al. 2019

Adv Elect Materials

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environmental variations such as isolated places, indoors, and dark surroundings. [1][2][3] The mechanical energy for wearable electronics is more reliable and environmentally independent as well as continuous energy source than the solar or the thermal energy, and it is easily convertible to the electrical energy using electromagnetic induction, [4] triboelectric effect, [5] piezoelectric principle, [6] and so forth. Among them, in particular, triboelectric and/or piezoelectric effect-driven energy devices have drawn much higher attentions for future self-powered electronic system than electromagnetic induction-utilized devices due to simple processes, excellent flexibility, high voltage, and power output as well as easy size-scaling, etc. [5][6][7][8][9][10] Since the output power which can be derived from human motion-related activities mainly depends on the operating frequencies and the degree of deformation (i.e., strain), power generators should be composed of highly flexible and durable materials having robust structures. [6,11,12] Among various flexible substrates, the paper, consisting of multiple cellulose fibers, is identified as the most eco-friendly substrate material with very low cost and excellent recyclability. [12][13][14] Furthermore, the use of paper substrates for flexible devices is potentially beneficial for the Key solutions for material selection, processing, and performance of environmentally friendly high-power generators are addressed. High voltage and high power generation of flexible devices using piezoelectric Bi 0.5 (Na 0.78 K 0.22 ) TiO 3 nanoparticle filler-polydimethylsiloxane (PDMS) elastomeric matrix for a lead-free piezoelectric composite film on a cellulose paper substrate is demonstrated. To elucidate the principle of power generation by the piezoelectric composite configuration, the dielectric and piezoelectric characteristics of the composite film are investigated and the results are compared with those of theoretical modeling. The paper-based composite generator produces a large output voltage of ≈100 V and an average current of ≈20 µA (max. ≈30 µA) through tapping stimulation, which is a record-high performance compared to previously reported flexible lead-free piezoelectric composite energy harvesters. Moreover, a triboelectric-hybridized piezoelectric composite device using a micro-patterned PDMS shows a much higher output voltage of ≈250 V and output power of ≈0.5 mW, which drives 300 light-emitting diodes. These results prove that a new class of paper-based and lead-free energy harvesting device provides a strong possibility for enlarging the functionality and the capability of high-power scavengers in flexible and wearable electronics such as sensors and medical devices.One of the best power sources for the human activity-based self-powered wearable electronic devices is the mechanical energy source because it is easily obtained from biological activities or human motions regardless of the location and the

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Requirements for the transfer of lead-free piezoceramics into application

Cited by 205 publications

References 119 publications

Temperature‐insensitive piezoelectricity in lead‐free NaNbO₃‐based ceramics

Temperature‐insensitive piezoelectricity in lead‐free NaNbO₃‐based ceramics

Crack‐tip toughness of lead‐free (1−x)(Na_1/2Bi_1/2)TiO₃–xBaTiO₃ piezoceramics

Lead‐Free Bi_0.5(Na_0.78K_0.22)TiO₃ Nanoparticle Filler–Elastomeric Composite Films for Paper‐Based Flexible Power Generators

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Requirements for the transfer of lead-free piezoceramics into application

Cited by 205 publications

References 119 publications

Temperature‐insensitive piezoelectricity in lead‐free NaNbO3‐based ceramics

Temperature‐insensitive piezoelectricity in lead‐free NaNbO3‐based ceramics

Crack‐tip toughness of lead‐free (1−x)(Na1/2Bi1/2)TiO3–xBaTiO3 piezoceramics

Lead‐Free Bi0.5(Na0.78K0.22)TiO3 Nanoparticle Filler–Elastomeric Composite Films for Paper‐Based Flexible Power Generators

Contact Info

Product

Resources

About

Temperature‐insensitive piezoelectricity in lead‐free NaNbO₃‐based ceramics

Temperature‐insensitive piezoelectricity in lead‐free NaNbO₃‐based ceramics

Crack‐tip toughness of lead‐free (1−x)(Na_1/2Bi_1/2)TiO₃–xBaTiO₃ piezoceramics

Lead‐Free Bi_0.5(Na_0.78K_0.22)TiO₃ Nanoparticle Filler–Elastomeric Composite Films for Paper‐Based Flexible Power Generators