Preparation and characterization of lead-free (K0.47Na0.51Li0.02)(Nb0.8Ta0.2)O3 piezoceramic/epoxy composites with 0–3 connectivity

Le, Duc Thang; Binh, Nam; Kim, Dae Uk; Hong, In-Ki; Kim, Ill-Whan; Lee, Jae‐Shin

doi:10.1016/j.ceramint.2011.04.096

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…To attain a d 33 , k t , and figure of merit similar to what we have demonstrated for 10 vol% structured KNLN3‐epoxy in random composites, a combination of high volume fractions of active material, large particle sizes, and high dielectric constant polymer matrices are necessary . In lead‐free composites based on KNN, similar properties have only been reported for 1‐3 composites, or volume contents of active material over 0.7 . While the figure of merit of the KNLN3 composite approaches that of the KNN bulk ceramic, an order of magnitude lower than PZT ceramics, the performance is similar to pure PVDF and its copolymers at significantly reduced dielectric loss.…”

Section: Discussionmentioning

confidence: 99%

“…A number of flexible lead‐free piezoelectric materials based on a composite of KNN‐based particles randomly dispersed in a polymer matrix have been developed for piezo‐electric energy harvesting . The chosen KNN fillers are identical to the compositions developed for optimal properties in ceramics, doped with sintering aids, at or near a polymorphic phase transition (PPT) or MPB.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing energy harvesting potential of (K,Na,Li)NbO₃‐epoxy composites via Li substitution

et al. 2016

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In this study, the influence of Li substitution on the piezoelectric performance of lead‐free K0.5Na0.5NbO3 (KNN)‐epoxy composites is explored. KNN piezoceramic particles modified with 0‐12 mol% of Li are prepared via a double calcination technique, resulting in a perovskite particulate which transitions from an orthorhombic to tetragonal crystal structure between 6 and 9 mol% of Li, and contains a minor nonperovskite second phase from 6 mol%. A cuboid particle morphology is evident in all cases, though tetragonal KNN‐based particles have formed with serrated edges and fractures. The particles are dispersed at 10 vol% in an epoxy matrix to develop both random and dielectrophoretically structured (K,Na,Li)NbO3‐epoxy composites. The dielectric constant of the composites appears almost independent of Li content, while the piezoelectric charge constant of structured composites peaks before the polymorphic phase transition, at 3 mol% of Li. The peak in performance can be attributed to the increased primary particle size of the composition in combination with its single phase orthorhombic crystal structure. The enhancement of the energy harvesting figure of merit, derived from substituting 3 mol% of Li in the KNN particulate, makes these composites an interesting choice for flexible energy generators.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing energy harvesting potential of (K,Na,Li)NbO₃‐epoxy composites via Li substitution

et al. 2016

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“…The first generation of polymer-matrix composites displayed 0-3 configuration [98][99][100][101][102][103][104] with significantly lower piezoelectric properties compared to ceramics as a result of insufficient poling of ceramic particles at low volume fractions. Due to the lower permittivity of the polymer phase, the electric flux concentrates more effectively on the polymer phase and does not affect the ceramic particles efficiently.…”

Section: Polymer-matrix Compositesmentioning

confidence: 99%

High voltage coefficient piezoelectric materials and their applications

Hooper

Roscow

Mathieson

et al. 2021

Journal of the European Ceramic Society

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“…Generally, the higher biasing electric field results more complete polarization. In a conventional method, piezoelectric ceramics are poled by applying an appropriate direct-current (DC) electric fields of 2 -500 kV/mm at elevated temperature around 80 o C -140 o C for 5 -30 minutes [12], [13], [18], [23], [25], [26]. Due to the anharmonicity of the chemical bonds, there will be an electrostrictive effect but it is masked by the more significant asymmetric displacement.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the piezoelectric charge coefficient d33 of thick-film piezoelectric ceramics by varying poling and repoling conditions

Radzi

Kok

2015

AIP Conference Proceedings

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Piezoelectric ceramics are commonly used in various sensing applications. In this paper, the effect of poling and repoling conditions on thick-film piezoelectric ceramics were investigated. The piezoelectric charge coefficient of the piezoelectric ceramics were measured with varying poling conditions, where the effect of changing poling temperature and electrical field on the d 33 were analyzed. This was followed by investigating on the effect high applied electrical fields results in repolarization the alignment of the piezoelectric domain in the opposite direction. The temperature and electrical field dependence polarization of the thick-film piezoelectric ceramics were varied near to its Curie temperature between 50 o C to 250 o C and at a range of electrical field from 20 V (400 kV/mm) up to 200 V (4 MV/mm). It was found that the piezoelectric properties increases with increasing the poling electric field and poling temperature significantly. The maximum values of piezoelectric coefficient were obtained for the piezoelectric ceramics poled at the Curie temperature with high electric fields for 15 min. The aging behavior of the piezoelectric ceramics shows that piezoelectric charge coefficient d 33 depends on the poling and repoling conditions.

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Preparation and characterization of lead-free (K0.47Na0.51Li0.02)(Nb0.8Ta0.2)O3 piezoceramic/epoxy composites with 0–3 connectivity

Cited by 12 publications

References 17 publications

Enhancing energy harvesting potential of (K,Na,Li)NbO₃‐epoxy composites via Li substitution

Enhancing energy harvesting potential of (K,Na,Li)NbO₃‐epoxy composites via Li substitution

High voltage coefficient piezoelectric materials and their applications

Investigation of the piezoelectric charge coefficient d33 of thick-film piezoelectric ceramics by varying poling and repoling conditions

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Preparation and characterization of lead-free (K0.47Na0.51Li0.02)(Nb0.8Ta0.2)O3 piezoceramic/epoxy composites with 0–3 connectivity

Cited by 12 publications

References 17 publications

Enhancing energy harvesting potential of (K,Na,Li)NbO3‐epoxy composites via Li substitution

Enhancing energy harvesting potential of (K,Na,Li)NbO3‐epoxy composites via Li substitution

High voltage coefficient piezoelectric materials and their applications

Investigation of the piezoelectric charge coefficient d33 of thick-film piezoelectric ceramics by varying poling and repoling conditions

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Product

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Enhancing energy harvesting potential of (K,Na,Li)NbO₃‐epoxy composites via Li substitution

Enhancing energy harvesting potential of (K,Na,Li)NbO₃‐epoxy composites via Li substitution