| People | Locations | Statistics |
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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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Bah, Micka
Université de Tours
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2024Subcoercive-field dielectric response of 0.5 (Ba 0.7 Ca 0.3 TiO 3 ) -0.5 (BaZr 0.2 Ti 0.8 O 3 ) thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricitycitations
- 2024BCTZ lead free thin films with Ce doping gradient: enhanced piezoelectricity and relaxor behaviour
- 2024Understanding Interfaces in AlScN/GaN Heterostructurescitations
- 2024Lead-free room-temperature ferroelectric thermal conductivity switch using anisotropies in thermal conductivities
- 2024Enhanced piezoelectricity properties and relaxor behaviour in (Ce, Y) co-doped BCTZ thin films libraries
- 2024Understanding interfaces in AlScN/GaN heterostructurescitations
- 2023Subcoercive-field dielectric response of 0.5 (Ba 0.7 Ca 0.3 TiO 3 ) -0.5 (BaZr 0.2 Ti 0.8 O 3 ) thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity
- 2023Performance improvement with non-alloyed ohmic contacts technology on AlGaN/GaN High Electron Mobility Transistors on 6H-SiC substratecitations
- 2022Real‐time capturing of microscale events controlling the sintering of lead‐free piezoelectric potassium‐sodium niobatecitations
- 2022Synthesis routes for enhanced piezoelectric properties in spark plasma sintered Ta-doped KNN ceramicscitations
- 2022Multifunctional energy storage and piezoelectric properties of 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 thick films on stainless-steel substratescitations
- 2022Effect of thermal annealing on dielectric and ferroelectric properties of aerosol-deposited 0.65Pb(Mg1/3Nb2/3)O3-0.35 PbTiO3 thick filmscitations
- 2022Multifunctional energy storage and piezoelectric properties of 0.65Pb(Mg 1/3 Nb 2/3 )O 3 –0.35PbTiO 3 thick films on stainless-steel substratescitations
- 2022The influence of Al 2 O 3 nanolamination in ALD ZrO 2 capacitor on physical and electrical characteristicscitations
- 2019High temperature piezoelectric properties of flux-grown α-GeO 2 single crystalcitations
- 2019High temperature piezoelectric properties of flux-grown α-GeO 2 single crystalcitations
- 2018Composite microstructures and piezoelectric properties in tantalum substituted lead-free K 0.5 Na 0.5 Nb 1-x Ta x O 3 ceramicscitations
- 2016Investigation of the domain structure and hierarchy in potassium–sodium niobate lead-free piezoelectric single crystalscitations
- 2015Ultrasonic transducers based on undoped lead-free (K0.5Na0.5)NbO3 ceramics.citations
- 2014High electromechanical performance with spark plasma sintering of undoped K0.5Na0.5NbO3 ceramicscitations
Places of action
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article
Ultrasonic transducers based on undoped lead-free (K0.5Na0.5)NbO3 ceramics.
Abstract
Lead zirconate titanate (PZT) ceramics are the dominant piezoelectric elements for non-destructive evaluation (NDE) and ultrasonic transducers devices. However, the presence of lead content may impose the scientific community to develop lead-free ceramics, concerning human health and environmental safety. During the past ten years, many contributions have highlighted the potential properties of complex compositions like LiNbO3, LiTaO3 and LiSbO3 in the lead-free (K0.5Na0.5)NbO3 KNN system. In this context, for the first time, the practical applications and the effectiveness of simply undoped (K0.5Na0.5)NbO3 (KNN) ceramics are investigated. KNN powder is prepared by conventional solid state mixed oxide route. Ceramics of this material are prepared using conventional sintering (CS) and spark plasma sintering (SPS). Thickness coupling factor kt of 44-46%, planar coupling factor kp of 29-45%, relative permittivity at constant strain ε33,r(S) of 125-243 and acoustic impedance Z of 23-30 MRay are obtained for these two kinds of undoped KNN ceramics. Both ceramics are used to build single-element ultrasonic transducers. Relative bandwidth of 49-78% and insertion loss of -27 and -51dB are obtained for SPS and CS transducers, respectively. These results are suitable for use in non-destructive evaluation. The effectiveness of undoped KNN is evaluated using the KLM model, and compared to standard PZT based probe. Finally, chemical aging test of undoped KNN has demonstrated its stability in water.