| 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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Bernardi, Johannes
TU Wien
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2022Characterization of an Al-Cu-Mg-Zn multi principal element alloy by experimental and computational screening methods
- 2021Mechanistic in situ insights into the formation, structural and catalytic aspects of the La2NiO4 intermediate phase in the dry reforming of methane over Ni-based perovskite catalystscitations
- 2019Promotion of La(Cu0.7Mn0.3)0.98M0.02O3−δ (M = Pd, Pt, Ru and Rh) perovskite catalysts by noble metals for the reduction of NO by COcitations
- 2019Epitaxial Ge0.81Sn0.19 nanowires for nanoscale mid-infrared emitterscitations
- 2019Stability and Local Environment of Transition Metal Ions in Vapor Phase Grown MgO Nanocrystals
- 2018Visualizing catalyst heterogeneity by a multifrequential oscillating reactioncitations
- 2015Diffusion parameters of grain-growth inhibitors in WC based hardmetals with Co, Fe/Ni and Fe/Co/Ni binder alloyscitations
- 2014Microstresses and crack formation in AlSi7MgCu and AlSi17Cu4 alloys for engine componentscitations
- 2004Low temperature fullerene encapsulation in single wall carbon nanotubes: Synthesis of N@C60@SWCNTcitations
Places of action
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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/>