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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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Zickler, Gregor
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Publications (7/7 displayed)
- 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
- 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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document
Stability and Local Environment of Transition Metal Ions in Vapor Phase Grown MgO Nanocrystals
Abstract
Structure and functional properties of mixed metal oxide nanoparticle systems are subject to stability and composition of related surfaces and interfaces. For vapor phase grown non-equilibrium solids, annealing induced ion diffusion provides efficient means to adjust the surface composition and, thus, functional properties of the material.<br/>In the present study we will discuss the transformation behavior of diluted transition metals (e.g. Fe, Co) in MgO nanocrystals, which were prepared by chemical vapor synthesis. Vacuum annealing changes the properties of the resulting non-equilibrium solids toward thermodynamic equilibrium and provides means to control impurity localization and to trigger phase separation. [1]<br/>By combining structural (XRD, TEM) and spectroscopic (XAS, XPS) characterization techniques, we tracked valence state and local chemical environment changes of admixed transition metal ions (TMI). Impurity concentration determines whether TMI are effectively diluted within the particles or additional effects, like enhanced ion diffusion and particle coarsening at elevated temperatures occur. This leads to clustering of Fe3+-Mg2+ vacancy complexes and, after annealing to T = 1173 K, surface migration as well as the nucleation of a magnesioferrite phase. [2] With regard to catalytic properties associated with TMI in MgO host lattices, the here presented insights underline that reorganization in the course of catalytic reactions on oxide nanoparticle catalysts is an important issue in terms of distribution and location of functional defects.<br/>