Progress in high-strain perovskite piezoelectric ceramics

Hao, Jigong; Li, Wei; Zhai, Jiwei; Chen, Haydn

doi:10.1016/j.mser.2018.08.001

Cited by 639 publications

(338 citation statements)

References 545 publications

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“…[27][28][29] The first is the small-signal piezoelectric coefficient which is determined by the slope of the strain response at low electric fields when the strain response is still linear. [25,32] The effective d 33 * (large-signal piezoelectric coefficient) of our BNKT ceramics is higher than small-signal d 33 , as shown in Figure 1d. The second is the large-signal piezo-response which is measured at high electric fields where the strain-field response deviates from linearity.…”

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confidence: 75%

“…[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%

“…[20][21][22] Fortunately, recent encouraging results have demonstrated that some of lead-free piezoelectric materials are beginning to approach PZT in performance. [23][24][25] The development of the perovskite (Bi,Na) TiO 3 -(Bi,K)TiO 3 family (BNT-BKT)-based ceramics has progressed to the point that the potential has been demonstrated, [20,25] and makes us confident that this material system is one of the best choices for environmentally friendly piezoelectric devices. [23][24][25] The development of the perovskite (Bi,Na) TiO 3 -(Bi,K)TiO 3 family (BNT-BKT)-based ceramics has progressed to the point that the potential has been demonstrated, [20,25] and makes us confident that this material system is one of the best choices for environmentally friendly piezoelectric devices.…”

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confidence: 99%

“…[20][21][22][23][24][25] The material systems that display the highest electromechanical coupling efficiencies are those with perovskite crystal structure. [25] Based on the results from Bi 0.5 (Na 0.78 K 0.22 )TiO 3 (BNKT) bulk ceramics, we selected 0.78BNT-0.22BKT as a main lead-free piezoelectric material for high-output piezoelectric power generators. It is well known that compositions near 0.8BNT-0.2BKT binary systems form a morphotropic phase boundary with rhombohedral and tetragonal mixed phases and produce higher piezoelectric properties than other compositions in bulk ceramics.…”

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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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confidence: 99%

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confidence: 99%

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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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“…[1][2][3][4] The perovskite Pb(Zr,Ti)O 3 (PZT) ceramics have always been the mainstay of piezoelectric materials because of their excellent piezoelectric properties, reliability, and versatility. [1][2][3][4] The perovskite Pb(Zr,Ti)O 3 (PZT) ceramics have always been the mainstay of piezoelectric materials because of their excellent piezoelectric properties, reliability, and versatility.…”

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A Study on the Relationship Between Grain Size and Electrical Properties in (K,Na)NbO₃‐Based Lead‐Free Piezoelectric Ceramics

Yang

et al. 2019

Adv Elect Materials

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The 0.5 wt% MnO2‐doped 0.95(K0.5Na0.5)(Nb0.965Sb0.035)O3‐0.01CaZrO3‐0.04(Bi0.5K0.5)(Hf0.98Ti0.02)O3 (95KNNS‐1CZ‐4BKHT) lead‐free ceramics with grain size from 0.31 to 3.83 µm are fabricated by hot‐press sintering (HPS), microwave sintering (MS), conventional sintering (CS), two‐step sintering (TSS), and a combination of two of the above‐mentioned methods. Then, the grain size effects on the phase transition, electrical properties, domain structure, and temperature stability of the ceramics are investigated. The phase structure evolves from single rhombohedral (R) phase to coexisted rhombohedral‐tetragonal (R‐T) phases around 1 µm. The electromechanical properties are strongly grain size dependent. The values of piezoelectric coefficient (d33) and planar electromechanical coupling factor (kp) first rise sharply when the grain size is less than 1 µm, and then increase mildly in the grain size range from 2.55 to 3.04 µm and finally almost remain a constant (≈450 pC N−1 and 54%) when the grain size is larger than 3.31 µm. The R‐T phase coexistence and strip‐like nanodomain structure characterized by an easier switching feature contribute to the high piezoelectric and electromechanical properties of coarse‐grained samples. This work not only clarifies the relationship between grain size and electrical properties in KNN‐based ceramics, but also provides a novel strategy for developing high‐performance lead‐free piezoceramics.

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2021

Lead‐Free Piezoelectric Materials

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Progress in high-strain perovskite piezoelectric ceramics

Cited by 639 publications

References 545 publications

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

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

A Study on the Relationship Between Grain Size and Electrical Properties in (K,Na)NbO₃‐Based Lead‐Free Piezoelectric Ceramics

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Progress in high-strain perovskite piezoelectric ceramics

Cited by 639 publications

References 545 publications

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

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

A Study on the Relationship Between Grain Size and Electrical Properties in (K,Na)NbO3‐Based Lead‐Free Piezoelectric Ceramics

Applications

Contact Info

Product

Resources

About

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

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

A Study on the Relationship Between Grain Size and Electrical Properties in (K,Na)NbO₃‐Based Lead‐Free Piezoelectric Ceramics