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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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Niedermaier, Matthias
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 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
Functionalization of Intergranular Regions inside Alkaline Earth Oxide Nanoparticle derived Ceramics
Abstract
There is an increasing awareness in the field of nanocrystalline ceramics that the controlled manipulation of matter with different impurity ions and at an atomic level affects composition, energetics and, thus, the functional properties of constituent grains and grain boundaries. Consequently, a fundamental understanding of impurity segregation and influence of surrounding atmospheres during processing is needed for efficient grain boundary engineering. [1, 2]<br/><br/>We used nanocrystalline powders of MgO with defined concentrations of impurities such as Ba2+-ions as starting material for ceramic processing to study the impact of gas adsorption during nanoparticle processing. The transformation of Ba-functionalized particle surfaces into functional interfaces and grain boundaries was achieved by uniaxial dry pressing and sintering (1373 K).<br/>Using complementary structure analysis techniques (X-ray Diffraction and Transmission Electron Microscopy) we addressed an apparent grain growth effect that occurs at room temperature. The phenomenon was rationalized by the size dependent dissolution properties of Ba-admixed MgO nanoparticles in the presence of water vapor. Electron microscopy measurements on ceramic samples revealed the annealing induced growth and reorganization of particles and grains and the simultaneous formation of a granular microstructure. Photoluminescence emission features that are specific to the surface excitonic properties of highly dispersed alkaline earth oxides were used as a diagnostic tool [3] and could have been retained during consolidation and sintering.<br/>