| 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
Real‐time capturing of microscale events controlling the sintering of lead‐free piezoelectric potassium‐sodium niobate
Abstract
Sintering is a very important process in materials science and technological applications. Despite breakthroughs in achieving optimized piezoelectric properties, fundamentals of K$_{0.5}$Na$_{0.5}$NbO$_3$ (KNN) sintering are not yet fully understood, facing densification versus grain growth competition. At present, microscale events during KNN sintering under reducing atmospheres are real-time monitored using a High Temperature-Environmental Scanning Electron Microscope. A two contacting KNN particles model satisfying the Kingery and Berg's bulk diffusion model is reported. Dynamic events like individual grain growth and grain elimination process are explored through a postanalysis of recorded image series. The diffusion coefficient for oxygen vacancies of 10$^{−8}$ cm$^2$ s$^{−1}$ and average boundary mobility of 10$^{−9}$ cm$^4$ J$^{−1}$ s$^{−1}$ are reported for the KNN ceramics. Moreover, the local pore shrinkage is consistent with the Kingery and François's concept of pore stability except that pore curvatures are not all concave, convex or flat due to anisotropic grain-boundary energies. The global grain growth kinetics are described using parabolic and/or cubic laws. The effect of atmospheres and microstructure evolution on the intrinsic and extrinsic contributions to the dielectric response using Rayleigh's law is also explored. These results bring a new breath for KNN sintering studies in order to adapt the sintering process.