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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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Hall, David
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2025Investigation of electric field-induced phase transitions in unfilled tungsten bronze relaxor ceramics designed by the high entropy conceptcitations
- 2024In situ electric field-dependent structural changes in (Ba,Ca)(Zr,Ti)O 3 with varying grain sizecitations
- 2024Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite-Barium Titanate Ceramicscitations
- 2024Broadband dielectric spectroscopy of Nb-doped 0.7BiFeO 3 -0.3BaTiO 3 ceramics
- 2024Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite–Barium Titanate Ceramicscitations
- 2024Influence of Grain Size on Electromechanical Properties of (Ba,Ca)(Zr,Ti)O 3 : A Multiscale Analysis Using Spark Plasma Sintering and Aerosol Depositioncitations
- 2024Organic Light-Emitting Diodes Comprising an Undoped Thermally Activated Delayed Fluorescence Emissive Layer and a Thick Inorganic Perovskite Hole Transport Layer
- 2024Domain switching and shear-mode piezoelectric response induced by cross-poling in polycrystalline ferroelectricscitations
- 2023Re-entrant Relaxor Ferroelectric Behaviour in Nb-Doped BiFeO3-BaTiO3 Ceramicscitations
- 2022Residual stress and domain switching in freeze cast porous barium titanatecitations
- 2020Reducing the Athena WFI charged particle background: results from Geant4 simulationscitations
- 2018Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramicscitations
- 2018Optimisation of functional properties in lead-free BiFeO 3 –BaTiO 3 ceramics through La 3+ substitution strategycitations
- 2017Chemical heterogeneity and approaches to its control in BiFeO 3 - BaTiO 3 lead-free ferroelectricscitations
- 2015Revisiting the blocking force test on ferroelectric ceramics using high energy x-ray diffractioncitations
- 2015The development of Zn–Ce hybrid redox flow batteries for energy storage and their continuing challengescitations
- 2014Development of EM-CCD-based X-ray detector for synchrotron applicationscitations
Places of action
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article
Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite-Barium Titanate Ceramics
Abstract
Lead-free BiFeO<sub>3</sub>–BaTiO<sub>3</sub> (BF-BT) piezoceramics have sparked considerable interest in recent years due to their high piezoelectric performance and high Curie temperature. In this paper, we show how the addition of highly aligned porosity (between 40 and 60 vol %) improves the piezoelectric performance, sensing, and energy harvesting figures of merit in freeze-cast 0.70BiFeO<sub>3</sub>–0.30BaTiO<sub>3</sub> piezoceramics compared to conventionally processed, nominally dense samples of the same composition. The dense and porous BF-BT ceramics had similar longitudinal piezoelectric coefficients (<i>d</i><sub>33</sub>) immediately after poling, yet the dense samples were observed to age faster than those of porous ceramics. After 24 h, for example, the porous samples had significantly higher <i>d</i><sub>33</sub> values ranging from 112 to 124 pC/N, compared to 85 pC/N for the dense samples. Porous samples exhibited 3 and 5 times higher longitudinal piezoelectric voltage coefficient <i>g</i><sub>33</sub> and energy harvesting figure of merit <i>d</i><sub>33</sub><i>g</i><sub>33</sub> than dense samples due to the unexpected increase in <i>d</i><sub>33</sub> and decrease in relative permittivity with porosity. Spontaneous polarization (Ps) and remnant polarization (Pr) decrease as the porosity content increased from 37 to 59 vol %, as expected due to the lower volume of active material; however, normalized polarization values with respect to porosity level showed a slight increase in the porous materials relative to the dense BF-BT. Furthermore, the porous ceramics showed improved temperature-dependent strain–field response compared to the dense. As a result, these porous materials show excellent potential for use in high temperature sensing and harvesting applications.