Fabrication and measurement of a flexoelectric micro-pyramid composite

Huang, Wenbin; Shu, Longlong; Kwon, Seol Ryung; Zhang, Shujun; Yuan, Fuh-Gwo; Jiang, Xiaoning

doi:10.1063/1.4904024

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…[26] Based on that, a group of studies were conducted on the flexoelectricity of BST-based ceramics. [27][28][29] Although ceramic materials can exhibit a relatively large flexoelectricity coefficient 12 (1.4−10 µC m −1 ), generating a large strain gradient remains a challenge. Due to their flexibility and capability of gen-erating a large strain, piezoelectric polymers have attracted considerable attention in this research area.…”

Section: Introductionmentioning

confidence: 99%

Flexophotovoltaic Effect in Potassium Sodium Niobate/Poly(Vinylidene Fluoride‐Trifluoroethylene) Nanocomposite

Wang

Zhang

et al. 2021

Advanced Science

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Flexoelectricity is an electromechanical coupling effect in which electric polarization is generated by a strain gradient. In this investigation, a potassium sodium niobite/poly(vinylidene fluoride-trifluoroethylene) (KNN/PVDF-TrFE)-based nanocomposite is fabricated, and the flexoelectric effect is used to enhance the photovoltaic current (I pv ) in the nanocomposite. It is found that both a pyroelectric current and photovoltaic current can be generated simultaneously in a light illumination process. However, the photovoltaic current (I pv ) in this process contributes ≈85% of the total current. When assessing the effect of flexoelectricity with a curvature of 1/20, the I pv of the curved KNN/PVDF-TrFE (20%) (K/P-20) composite increased by ≈13.9% compared to that of the flat K/P-20 nanocomposite. Similarly, at a curvature of 1/20, the I pv of the K/P-20 nanocomposite is 71.6% higher than that of the PVDF-TrFE film. However, the photovoltaic effect induced by flexoelectricity is much higher than the increased polarization from flexoelectricity, so this effect is called as the flexophotovoltaic effect. Furthermore, the calculated energy conversion efficiency of the K/P-20 film is 0.017%, which is comparable to the previous research result. This investigation shows great promise for PVDF-based nanocomposites in ferroelectric memory device applications.

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Section: Introductionmentioning

confidence: 99%

Flexophotovoltaic Effect in Potassium Sodium Niobate/Poly(Vinylidene Fluoride‐Trifluoroethylene) Nanocomposite

Wang

Zhang

et al. 2021

Advanced Science

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“…We now proceed to solve Equation (17) for the case where the electric field consists of a dc term E 0 and a small acoustic term…”

Section: Continuity Equationmentioning

confidence: 99%

“…In a recent work, the importance of flexoelectricity in pyramidal composite (Ba x Sr 1− x TiO 3 ) microstructures was investigated. [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

Acoustic Gain in Solids due to Piezoelectricity, Flexoelectricity, and Electrostriction

Willatzen

Gao

Christensen

et al. 2020

Adv Funct Materials

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A quantitative discussion of the combined influence of three electro mechanical effects: piezoelectricity, flexoelectricity, and electrostriction in solids is provided for acoustic absorption and gain. While piezoelec tricity occurs in noncentrosymmetric materials only, flexoelectricity and electrostriction exist in all materials. Two important new results are dem onstrated: 1) the possibility to realize acoustic gain in all materials (cen trosymmetric and noncentrosymmetric) when the acoustic Cherenkov condition is fulfilled, and 2) realization of acoustic gain in the presence of a strong dc electric field, even when the Cherenkov condition is not fulfilled, in the case of strong crosscoupling between piezoelectricity, flexoelec tricity, and electrostriction. A simple analytical expression for the acoustic dispersion relation is derived for the combined effect of piezoelectricity, flexoelectricity, and electrostriction. At lower frequencies, the piezoelectric effect dominates for inversionasymmetric materials. At high frequencies (≈>1 MHz) flexoelectricity becomes increasingly important and eventually provides a major mechanism for gain and absorption in barium titanate (BaTiO 3). In the presence of strong electric fields (≈>1 MV m −1), electrostric tion provides a dominant isolated contribution to absorption/gain in BaTiO 3. Strong coupling between the three electromechanical contributions determines the total absorption/gain coefficient.

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“…Studies suggest that the so-called flexoelectric piezoelectric composites can generate large effective piezoelectric response. Several types of flexoelectric piezoelectric composites have been realised experimentally [21,28,41,58,[66][67][68][69]. The first type is the composite with the truncated pyramid structure, as shown in Fig.…”

Section: Flexoelectric Piezoelectric Compositesmentioning

confidence: 99%

Flexoelectricity in ferroelectric materials

Zhou

Chen

Chu

2019

IET Nanodielectrics

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Flexoelectricity is a gradient electromechanical effect that exists in all solid dielectrics. The effect was first predicted in the late 1950s, but received little interest because it was expected to be small. The experimentally measured large flexoelectric response in ferroelectric ceramics led to the revival of the field in the early 2000s. In this study, the progress made in the flexoelectric field is reviewed. The authors' focus will be primarily on the experimental studies related to the flexoelectric effect. The techniques employed to measure the flexoelectric coefficients are first summarised. A compilation of the flexoelectric coefficients of different ferroelectrics reported in the literature will be presented. An unresolved issue in this field is that the measured flexoelectric coefficients in ferroelectric materials are normally much greater than the theoretically predicted values, and the mechanisms proposed to explain this issue are discussed. Finally, the efforts toward the applications of the flexoelectric effect are reviewed.

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Fabrication and measurement of a flexoelectric micro-pyramid composite

Cited by 11 publications

References 24 publications

Flexophotovoltaic Effect in Potassium Sodium Niobate/Poly(Vinylidene Fluoride‐Trifluoroethylene) Nanocomposite

Flexophotovoltaic Effect in Potassium Sodium Niobate/Poly(Vinylidene Fluoride‐Trifluoroethylene) Nanocomposite

Acoustic Gain in Solids due to Piezoelectricity, Flexoelectricity, and Electrostriction

Flexoelectricity in ferroelectric materials

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