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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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Schwab, Thomas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2023Charge Separation in BaTiO3 Nanocrystals: Spontaneous Polarization versus Point Defect Chemistrycitations
- 2023Standardized method for mechanistic modeling of multimodal anion exchange chromatography in flow through operationcitations
- 2021Segregation Engineering in MgO Nanoparticle-Derived Ceramics: The Impact of Calcium and Barium Admixtures on the Microstructure and Light Emission Propertiescitations
- 2021Always cubes: A comparative evaluation of gas phase synthesis methods and precursor selection for the production of MgO nanoparticlescitations
- 2021Rubbing Powderscitations
- 2021Rubbing Powders:Direct Spectroscopic Observation of Triboinduced Oxygen Radical Formation in MgO Nanocube Ensemblescitations
- 2020Catalytic activity, water formation, and sintering: Methane activation over Co- and Fe-doped MgO nanocrystalscitations
- 2020Role and activity of iron and indium impurities on coarsening and functional properties in MgO nanoparticle derived ceramics
- 2019Functionalization of Intergranular Regions inside Alkaline Earth Oxide Nanoparticle derived Ceramics
- 2019Impurity Segregation and Nanoparticle Reorganization of Indium Doped MgO Cubescitations
- 2019Stability and Local Environment of Transition Metal Ions in Vapor Phase Grown MgO Nanocrystals
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article
Charge Separation in BaTiO3 Nanocrystals: Spontaneous Polarization versus Point Defect Chemistry
Abstract
<p>The fate of photogenerated charges within ferroelectric metal oxides is key for photocatalytic applications. The authors study the contributions of i) tetragonal distortion, responsible for spontaneous polarization, and ii) point defects, on charge separation and recombination within BaTiO<sub>3</sub> (BTO) nanocrystals of cubic and tetragonal structure. Electron paramagnetic resonance (EPR) in combination with O<sub>2</sub> photoadsorption experiments show that BTO nanocrystals annealed at 600 °C have a charge separation yield enhanced by a factor > 10 compared to TiO<sub>2</sub> anatase nanocrystals of similar geometries. This demonstrates for the first time the beneficial effect of the BTO perovskite nanocrystal lattice on charge separation. Strikingly, charge separation is considerably hindered within BTO nanoparticles annealed ≥ 600 °C, due to the formation of Ba–O divacancies that act as charge recombination centers. The opposing interplay between tetragonal distortion and annealing-induced defect formation inside the lattice highlights the importance of defect engineering within perovskite nanoparticles.</p>