Bi-based lead-free ceramic multilayer actuators using AgPd–(Na0.51K0.47Li0.02)(Nb0.8Ta0.2)O3 composite inner electrodes

Nguyen, Van-Quyet; Kang, Jin-Kyu; Han, Hongliang; Lee, Hyun‐Young; Jeong, Soon‐Jong; Ahn, Chang Won; Kim, Ill-Won; Lee, Jae‐Shin

doi:10.1016/j.sna.2012.10.036

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…There usually sol-gel derived Barium Titanate powder with grain size around 100 nm is part of the nickel paste for inner electrodes. Such a concept for composite electrodes was suggested for lead free multilayer actuators based on BNT-BKT solid solution by Nguyen, et al [158]. They applied a composite electrode consisting of Silver-Palladium alloy and powder of Potassium-Sodium-Niobate doped with Lithium and Tantalum.…”

Section: Features Of Actuator Materialsmentioning

confidence: 99%

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

2015

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The ban of lead in many electronic products and the expectation that, sooner or later, this ban will include the currently exempt piezoelectric ceramics based on Lead-Zirconate-Titanate has motivated many research groups to look for lead-free substitutes. After a short overview on different classes of lead-free piezoelectric ceramics with large strain, this review will focus on Bismuth-Sodium-Titanate and its solid solutions. These compounds exhibit extraordinarily high strain, due to a field induced phase transition, which makes them attractive for actuator applications. The structural features of these materials and the origin of the field-induced strain will be revised. Technologies for texturing, which increases the useable strain, will be introduced. Finally, the features that are relevant for the application of these materials in a multilayer design will be summarized.

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Section: Features Of Actuator Materialsmentioning

confidence: 99%

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

2015

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“…Internal electrode behavior changes depending on sintering conditions. Thermal mismatch of electrode and ceramic causes deformation on inner electrode and delamination defect while sintering [30] and decrease in polarisation loop [31]. Also Ag-Pd electrode was not preferred before it was known that the presence of excess bismuth exists in the composition and would cause the reaction with palladium [32].…”

Section: Resultsmentioning

confidence: 99%

Effect of Manganese Addition on 94NBT-6BT Lead Free Multilayer Ceramics

Gül¹,

Gürbüz²,

Gokceyrek³

et al. 2020

ujms

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In this study, lead-free 94Bi0,5Na0,5TiO3-6BaTiO3 (94NBT-6BT) ceramics were fabricated by solidstate synthesis method at ambient atmosphere. Glassy phase and rounded particles in 94NBT-6BT was observed with increasing Mn content. The effects of doping manganese on the ferroelectric properties of 94NBT-6BT bulk ceramics were evaluated. From the XRD results of the calcined powders, peaks were slightly changed to higher 2 theta value while increasing manganese ratio. Multivalence additive Mn ions act as acceptor dopant in 94NBT-6BT structure at ambient atmosphere. Samples were sintered from 1075°C to 1175°C for 2 hours to obtain highest piezoelectric values. SEM results show that glassy phase and rounded particles in 94NBT-6BT was observed with increasing Mn content so, bulk density was enhanced up to 1125C. From the results, 0.3 wt% manganese doped 94NBT-6BT samples have highest electromechanical coupling factor about 0.23, mechanical coupling factor (Qm) 150 and d33 110 pC/N respectively. Further work, 94NBT-6BT and Mn-doped 94NBT-6BT multilayer actuators were manufactured by water-based tape casting technique. The active area was 49 mm 2 MLA and was fabricated by using Ag-Pd internal electrode without Pd-Bi reaction at the electrode-ceramic interface. Hysterisis loop measurements of manufactured lead free actuators were done by using Aixacct CMA module. Remnant polarization values of Mn-doped 94NBT-6BT MLA for a layer were higher than 6 µC/cm 2 .

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“…Generally, since most electromechanical materials work in the unipolar mode, more attention should be paid to the unipolar electro‐strain of the material. Therefore, different compositions of BNKLT‐based ceramics were tested to study the unipolar electro‐strains of the samples, as shown in Figure A.…”

Section: Resultsmentioning

confidence: 99%

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

Han

Yin

2019

J Am Ceram Soc

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Due to their superior piezo‐responses (strain S > 0.3%), bismuth sodium titanate (BNT)‐based relaxor ferroelectrics have received much attention. Compared to other chemical elements, tantalum (Ta) doping provides superior electro‐strain for these ferroelectrics, while the effect of Ta2O5 as oxide additive has been rarely reported. Herein, lead‐free piezoceramics of Bi0.5(Na0.72K0.22Li0.06)0.5TiO3‐xTa2O5 (BNKLT‐xTa2O5, x = 0‐0.015) are synthesized. We study the effects of Ta2O5 addition on the crystal structure, piezoelectric responses, dielectric properties, and ferroelectric properties of BNKLT ceramics. All of the ceramics exhibit a typical perovskite structure, and Ta2O5 diffuses into the BNKLT lattice to form a uniform solid solution. The addition of Ta2O5 can make the grains more regular and uniform, while excess Ta2O5 result in finer grains. The undoped BNKLT ceramics show good ferroelectric and piezoelectric properties (remnant polarization Pr = 22.5 μC/cm2 and piezoelectric coefficient d33 = 250 pC/N); however, the addition of Ta2O5 leads to an clear degradation in d33 and Pr. Meanwhile, the addition of an appropriate Ta2O5 amount leads to an increase in the electro‐strain, and the unipolar strain reaches 0.385% under 60 kV/cm for x = 0.003, together with a higher normalized strain (d33*=Smax/Emax) of 633 pm/V (x = 0.003). The enhanced strain behaviors can be attributed to the coexistence of the ferroelectric and relaxor states, and an excellent electrostriction coefficient Q33 (Q33 = S/P2) value of 0.038 m4C−2 is obtained under 60 kV/cm for x = 0.003.

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Bi-based lead-free ceramic multilayer actuators using AgPd–(Na0.51K0.47Li0.02)(Nb0.8Ta0.2)O3 composite inner electrodes

Cited by 15 publications

References 28 publications

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Effect of Manganese Addition on 94NBT-6BT Lead Free Multilayer Ceramics

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition

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Bi-based lead-free ceramic multilayer actuators using AgPd–(Na0.51K0.47Li0.02)(Nb0.8Ta0.2)O3 composite inner electrodes

Cited by 15 publications

References 28 publications

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Bismuth Sodium Titanate Based Materials for Piezoelectric Actuators

Effect of Manganese Addition on 94NBT-6BT Lead Free Multilayer Ceramics

BNT‐based ferroelectric ceramics: Electrical properties modification by Ta2O5 oxide addition

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BNT‐based ferroelectric ceramics: Electrical properties modification by Ta₂O₅ oxide addition