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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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Zhang, Yan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2023Recyclable 3D‐Printed Aqueous Lithium‐Ion Batterycitations
- 2023Controlling Charge Transport in 2D Conductive MOFs─The Role of Nitrogen-Rich Ligands and Chemical Functionality.citations
- 2022Interface Stability between Na3Zr2Si2PO12 Solid Electrolyte and Sodium Metal Anode for Quasi-Solid-State Sodium Batterycitations
- 2022Ultrasonic Transducers made from Freeze-Cast Porous Piezoceramicscitations
- 2021Piezoelectric tunability and topological insulator transition in a GaN/InN/GaN quantum-well devicecitations
- 2021Patch test–relevant concentrations of metal salts cause localized cytotoxicity, including apoptosis, in skin ex vivocitations
- 2021Correlation between dielectric, mechanical properties and electromechanical performance of functionalized graphene / polyurethane nanocompositescitations
- 2020Self-healing dielectric elastomers for damage-Tolerant actuation and energy harvestingcitations
- 2020Harnessing Plasticity in an Amine-Borane as a Piezoelectric and Pyroelectric Flexible Filmcitations
- 2019Piezoelectric performance of PZT-based materials with aligned porosity::experiment and modellingcitations
- 2019Ice-templated poly(vinylidene fluoride) ferroelectretscitations
- 2019Piezoelectric performance of PZT-based materials with aligned porosity:citations
- 20181-3-Type Composites Based on Ferroelectrics:Electromechanical Coupling, Figures of Merit, and Piezotechnical Energy-Harvesting Applicationscitations
- 2018Understanding the effect of porosity on the polarisation-field response of ferroelectric materialscitations
- 20181-3-Type Composites Based on Ferroelectricscitations
- 2018Ice-templated poly(vinylidene fluoride) ferroelectretscitations
- 2016Tannic Acid and Cholesterol-Dopamine as Building Blocks in Composite Coatings for Substrate-Mediated Drug Deliverycitations
- 2016Tannic Acid and Cholesterol-Dopamine as Building Blocks in Composite Coatings for Substrate-Mediated Drug Deliverycitations
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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.