Multifunctional lead-free K0.5Bi0.5TiO3-based ceramic reinforced PVDF matrix composites

Dwivedi, Sushmita; Badole, Manish; Pareek, Tanvi; Kumar, Sunil

doi:10.1016/j.jallcom.2021.159616

Cited by 18 publications

(8 citation statements)

References 56 publications

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“…Several energy generators based on triboelectric, electromagnetic, solar, piezoelectric, and thermoelectric effects were developed for various electrical, electronic, and electromechanical applications . Out of these, piezoelectrics are known for their unique functional properties that enable these materials to be used in multiple sensing, actuation, and energy harvesting applications. − For high-performance energy generators (PEGs) and sensors, a piezoelectric should possess large values of piezoelectric voltage coefficient ( g 33 = d 33 /(ε r ε 0 ); ε r is the relative permittivity of the piezoelectric and ε 0 is the permittivity of free space) . Thus, to achieve high g 33 , piezoelectric must exhibit large d 33 and low ε r .…”

Section: Introductionmentioning

confidence: 99%

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

Badole,

Vasavan,

Saxena

et al. 2023

ACS Appl. Electron. Mater.

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grain-oriented 0.95K 0.5 Bi 0.5 TiO 3 −0.05BiAlO 3 (named K5BA-T) ceramics were prepared via the reactive template grain growth (RTGG) and tape casting technique. High-aspect-ratio K5BA powder was prepared using a plate-shape 4layer aurivillius oxide (K 0.5 Bi 4.5 Ti 4 O 15 ) powder as the template. The effects of grain morphology modification and texturing on the structural, dielectric, and piezoelectric properties of K5BA-T were systematically investigated. The average plate size of ∼6.5 μm with a thickness of ∼400 nm was observed in the K5BA sample. X-ray diffraction (XRD) and bulk texture measurements confirmed the texturing of K5BA-T in the [00l] crystallographic direction with a calculated Lotgering factor of ∼80%. Two anomalies in the temperature-dependent dielectric plot of the poled K5BA-T sample signified additional poling-induced phase transition. A lower value of room-temperature (RT) dielectric constant (ε r ) of ∼ 200 (at 1 MHz) and a higher piezoelectric charge coefficient (d 33 ) of ∼145 pCN −1 were obtained in the poled K5BA-T ceramic compared to that of the 0.95K 0.5 Bi 0.5 TiO 3 −0.05BiAlO 3 ceramic with randomly oriented grains (named K5BA-R). Consequently, the piezoelectric voltage coefficient (g 33 ) estimated for the textured ceramic showed a 650% increment (g 33 ∼ 80 × 10 −3 V mN −1 ) over the K5BA-R sample (g 33 ∼ 12.5 × 10 −3 V mN −1 ). The transduction coefficient (d 33 •g 33 ) of K5BA-T ceramic was calculated to be ∼11 600 × 10 −15 m 2 N −1 , which is nearly 9 times higher compared to its random counterpart. Further, a piezodevice fabricated using poled ceramic for energy harvesting showed an output voltage of ∼7 V with a current response of ∼2 μA under normal finger-tapping motion.

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Section: Introductionmentioning

confidence: 99%

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

Badole,

Vasavan,

Saxena

et al. 2023

ACS Appl. Electron. Mater.

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“…The addition of ceramic filler resulted in better thermal stability, an apparent evolution of ferroelectric β-phase over the other non-electroactive phases due to electrostatic interaction at the ceramic-polymer interface, and a significant increase in the dielectric and piezoelectric performance. 30 In this literature, P(VDF-TrFE) instead of PVDF was used as a matrix because this copolymer is naturally ferroelectricity from melt or tape casting from solution with needless further stretching process of obtaining the β-PVDF. 31,32 Simultaneously, the dielectric properties of inorganic fillers are the critical factors to determine the piezoelectric performance of this kind of composite.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al 29 found that the sample with a 30% mass ratio of KNN in KNN/P(VDF‐TrFE) composite showed the best thermoelectric performance. Sushmita Dwivedi et al 30 prepared KBT‐5BA/PVDF lead‐free piezoelectric composites by hot pressing technology. The addition of ceramic filler resulted in better thermal stability, an apparent evolution of ferroelectric β‐phase over the other non‐electroactive phases due to electrostatic interaction at the ceramic‐polymer interface, and a significant increase in the dielectric and piezoelectric performance 30 .…”

Section: Introductionmentioning

confidence: 99%

A (Ba_0.₉₄Ca₀_.06)(Ti_0.₉₅Zr₀_.05)O₃ ceramic sheet doping to improve the inverse piezoelectric effect of the poly (vinylidene fluoride‐trifluoroethylene)‐based composite film

et al. 2023

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A lead‐free tetragonal‐phase (Ba0.94Ca0.06)(Ti0.95Zr0.05)O3 (BCTZ) micro sheet is prepared by molten‐salt growth method, which exhibits a polarizing behavior of relaxor ferroelectricity and possesses a high dielectric constant (εr) of ~2400. Subsequently, the BCTZ sheet is evenly doped into ferroelectric copolymer P(VDF‐TrFE)55/45 mol% with different mass fractions, and the flexible BCTZ/P(VDF‐TrFE) composite films are prepared using a conventional solution casting process. εr of BCTZ/P(VDF‐TrFE) increases with the mass content of BCTZ, and reaches 23.8 in 20 wt% BCTZ sample. Meanwhile, at a high electrical field of 30 MV/m, the strain and electric field of BCTZ/P(VDF‐TrFE) are in the opposite direction, indicating a negative value of piezoelectric strain coefficient (d33) caused by inverse piezoelectric effect. In addition, d33 of different BCTZ/P(VDF‐TrFE) films are fitted using a strain‐electrical field curve, which firstly increases and then decreases with increases in BCTZ content. As such, a high d33 of −47.3 pC/N is obtained in BCTZ/P(VDF‐TrFE)15/85 wt% film. Thus, this research concerning the inverse piezoelectric effect may provide a reference for designing a piezoelectric composite using in transducers and actuators.

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“…7,8 However, high loading of ceramics (>40 vol%) is usually required to obtain polymer composites with high dielectric constant, which may cause the sacrifice of breakdown strength, processability, and mechanical properties. [9][10][11] Although less loading of conductive fillers can significantly raise the dielectric constant of polymer composites near the percolation threshold, the leakage current induced by the construction of conductive paths is a hidden risk for the sharp increase of dielectric loss and decrease of breakdown strength. [12][13][14] Therefore, cooperative effects of multi-phase polymer composites filled with both ceramics and conductive fillers have been attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

“…Incorporating ceramic fillers with high dielectric constant or conductive fillers into polymers are the common strategies to overcome this problem 7,8 . However, high loading of ceramics (>40 vol%) is usually required to obtain polymer composites with high dielectric constant, which may cause the sacrifice of breakdown strength, processability, and mechanical properties 9–11 . Although less loading of conductive fillers can significantly raise the dielectric constant of polymer composites near the percolation threshold, the leakage current induced by the construction of conductive paths is a hidden risk for the sharp increase of dielectric loss and decrease of breakdown strength 12–14 .…”

Section: Introductionmentioning

confidence: 99%

Synergistic enhancement in mechanical, thermal, and dielectric properties of PANI@BT/PVDF composites by adding 2D nanoplatelets

Deng

et al. 2022

J of Applied Polymer Sci

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Polymer‐based dielectric composites with simultaneously improved dielectric constant and breakdown strength have great potential applications in energy storage. In this paper, polyaniline@BaTiO3 (PANI@BT) nanoparticles with core‐shell structure are first fabricated by in‐situ chemical oxidative polymerization, and deposited on the surface of two‐dimensional nanoplatelets (graphene oxide [GO] and hexagonal boron nitride nanosheets [BNNS]), which are then utilized to prepare poly(vinylidene fluoride) (PVDF)‐based composites. The presence of 2D nanoplatelets is found to significantly ameliorate the dispersion of PANI@BT particles in the PVDF matrix, and thus endowing the resultant PVDF composites with improved comprehensive performance. The dielectric constant of PANI@BT‐GO/PVDF and PANI@BT‐BNNS/PVDF composites with 50 wt% fillers increase to 124.9 and 169.5 at 100 Hz, accompanied with relatively low dielectric loss. When the filler content is 10 wt%, the breakdown strength of PANI@BT‐BNNS/PVDF achieves 133.5 kV/mm, which is 9.7% and 71.8% higher than that of the pristine PVDF and PANI@BT/PVDF composites. Meanwhile, the tensile stress also reaches the highest value of 43.38 MPa. In addition, the PANI@BT‐GO/PVDF and PANI@BT‐BNNS/PVDF composites present higher thermal decomposition temperature in comparison with PANI@BT/PVDF composites.

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Multifunctional lead-free K0.5Bi0.5TiO3-based ceramic reinforced PVDF matrix composites

Cited by 18 publications

References 56 publications

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

A (Ba_0.₉₄Ca₀_.06)(Ti_0.₉₅Zr₀_.05)O₃ ceramic sheet doping to improve the inverse piezoelectric effect of the poly (vinylidene fluoride‐trifluoroethylene)‐based composite film

Synergistic enhancement in mechanical, thermal, and dielectric properties of PANI@BT/PVDF composites by adding 2D nanoplatelets

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Multifunctional lead-free K0.5Bi0.5TiO3-based ceramic reinforced PVDF matrix composites

Cited by 18 publications

References 56 publications

High-Performance [00l]-Textured BiAlO3-Doped K0.5Bi0.5TiO3 Ceramics

High-Performance [00l]-Textured BiAlO3-Doped K0.5Bi0.5TiO3 Ceramics

A (Ba0.94Ca0.06)(Ti0.95Zr0.05)O3 ceramic sheet doping to improve the inverse piezoelectric effect of the poly (vinylidene fluoride‐trifluoroethylene)‐based composite film

Synergistic enhancement in mechanical, thermal, and dielectric properties of PANI@BT/PVDF composites by adding 2D nanoplatelets

Contact Info

Product

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High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

High-Performance [00l]-Textured BiAlO₃-Doped K_0.5Bi_0.5TiO₃ Ceramics

A (Ba_0.₉₄Ca₀_.06)(Ti_0.₉₅Zr₀_.05)O₃ ceramic sheet doping to improve the inverse piezoelectric effect of the poly (vinylidene fluoride‐trifluoroethylene)‐based composite film