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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Roscow, James
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2024Porous Structure Enhances the Longitudinal Piezoelectric Coefficient and Electromechanical Coupling Coefficient of Lead-Free (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3citations
- 2024Porous structure enhances the longitudinal piezoelectric coefficient and electromechanical coupling coefficient of lead‐free (Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3citations
- 2024Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite-Barium Titanate Ceramicscitations
- 2024Ferroelectric-enhanced batteries for rapid charging and improved long-term performancecitations
- 2024Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite–Barium Titanate Ceramicscitations
- 2024Exploring Lead-Free Materials for Screen-Printed Piezoelectric Wearable Devicescitations
- 2023The unusual case of plastic deformation and high dislocation densities with the cold sintering of the piezoelectric ceramic K0.5Na0.5NbO3citations
- 2022Twelve modified figures of merit of 2–2-type composites based on relaxor-ferroelectric single crystalscitations
- 2022Innovative piezo-active composites and their structure - Property relationshipscitations
- 2022Residual stress and domain switching in freeze cast porous barium titanatecitations
- 2022Ultrasonic Transducers made from Freeze-Cast Porous Piezoceramicscitations
- 2019Orienting anisometric pores in ferroelectrics:Piezoelectric property engineering through local electric field distributionscitations
- 2019Modified energy harvesting figures of merit for stress- and strain-driven piezoelectric systemscitations
- 2018Freeze cast porous barium titanate for enhanced piezoelectric energy harvestingcitations
- 2018Corrigendum to “Modelling and fabrication of porous sandwich layer barium titanate with improved piezoelectric energy harvesting figures of merit” [Acta Mater. 128 (2017) 207–217](S1359645417301209)(10.1016/j.actamat.2017.02.029)citations
- 2018Understanding the effect of porosity on the polarisation-field response of ferroelectric materialscitations
- 2017Modelling and fabrication of porous sandwich layer barium titanate with improved piezoelectric energy harvesting figures of meritcitations
- 2016Manufacture and characterization of porous ferroelectrics for piezoelectric energy harvesting applicationscitations
Places of action
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article
Ultrasonic Transducers made from Freeze-Cast Porous Piezoceramics
Abstract
Porous and composite piezoelectric ceramics are of interest for underwater ultrasonic transducers due to their improved voltage sensitivity and acoustic matching with water, compared with their dense counterparts. Commonly, these materials are fabricated by dice-and-fill of sintered blocks of polycrystalline piezoceramic, which results in a high volume of waste. The freeze-casting technique offers a low waste and scalable alternative to the dice-and-fill method to produce porous piezoceramics with highly orientated, anisometric pores. In this article, we have fabricated underwater ultrasonic transducers from freeze-cast lead zirconate titanate (PZT) with a range of porosities. The porous PZT samples were characterized in terms of their piezoelectric and dielectric properties before being encapsulated for acoustic performance testing in water. Off resonance, the on-axis receive sensitivity of the manufactured devices was approximately-200 ± 10 dB re 1 V μ Pa; the transmit voltage response (TVR) was in the range of approximately 115 ± 5 dB re 1 μ Pa/V at 60 kHz to 132.5 ± 2.5 dB re 1 μ Pa/{V} at 180 kHz. The most porous transducer devices (0.51, 0.43, and 0.33 pore fraction) exhibited primarily a thickness mode resonance, whereas the least porous transducers (0.29 pore fraction and dense benchmark) exhibited an undesired radial mode, which was observed as an additional resonant peak in the electrical impedance measurements and lateral off-axis lobes in the acoustic beampatterns. Our results show that the acoustic sensitivities and TVRs of the porous freeze-cast transducers are comparable to those of a dense pressed transducer. However, the freeze-cast transducers with porosity exceeding 0.30 pore fraction were shown to achieve an effective structure with aligned porosity that suppressed undesired radial mode resonances.