| 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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Hofer, Ferdinand
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Publications (26/26 displayed)
- 2024Three-dimensional distribution of individual atoms in the channels of beryl
- 2024Atom by atom analysis of defect structures in doped STO
- 2022Quantifying Ordering Phenomena at the Atomic Scale in Rare Earth Oxide Ceramics via EELS Elemental Mapping
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- 2022Mixed-metal nanoparticlescitations
- 2021An In Situ Synchrotron Dilatometry and Atomistic Study of Martensite and Carbide Formation during Partitioning and Temperingcitations
- 2021Spectroscopic STEM imaging in 2D and 3D
- 2020Helium droplet assisted synthesis of plasmonic Ag@ZnO core@shell nanoparticlescitations
- 2020Ultrashort XUV pulse absorption spectroscopy of partially oxidized cobalt nanoparticlescitations
- 2019Ultra-thin h-BN substrates for nanoscale plasmon spectroscopycitations
- 2019On the passivation of iron particles at the nanoscalecitations
- 2019The impact of swift electrons on the segregation of Ni-Au nanoalloyscitations
- 2019Effects of the Core Location on the Structural Stability of Ni-Au Core-Shell Nanoparticlescitations
- 2019Structural characterization of poly-Si Films crystallized by Ni Metal Induced Lateral Crystallizationcitations
- 2018Stability of Core-Shell Nanoparticles for Catalysis at Elevated Temperaturescitations
- 2018How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?citations
- 2017Thermally induced breakup of metallic nanowirescitations
- 2017Inclusions in Si whiskers grown by Ni metal induced lateral crystallizationcitations
- 2017How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?citations
- 2016Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography
- 2014Order vs. disorder — a huge increase in ionic conductivity of nanocrystalline LiAlO2 embedded in an amorphous-like matrix of lithium aluminatecitations
- 2013Bismuth sulphide–polymer nanocomposites from a highly soluble bismuth xanthate precursorcitations
- 2013Influence of the bridging atom in fluorene analogue low‐bandgap polymers on photophysical and morphological properties of copper indium sulfide/polymer nanocomposite solar cellscitations
- 2012Comprehensive Investigation of Silver Nanoparticle/Aluminum Electrodes for Copper Indium Sulfide/Polymer Hybrid Solar Cellscitations
- 2012Application of elemental microanalysis to elucidate the role of spherites in the digestive gland of the helicid snail Chilostoma lefeburiana
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document
Atom by atom analysis of defect structures in doped STO
Abstract
SrTiO3 (STO) is one of many complex oxide materials, which are of high interest in a<br/>plethora of technological applications due to their wide range of magnetic and electronic<br/>properties. Introducing small amounts of dopants and/or vacancies into the materials can<br/>tailor these properties over a wide range. Therefore, information about the electronic and the<br/>structural configuration of defects is essential. In metal oxides such as STO, solids are<br/>ionically bonded with many types of defects that shape the properties. 0D-defects or point<br/>defects play a major role regarding controlling and optimizing these materials. Figure 1<br/>shows different point defects in ionic compounds. The materials chosen for method<br/>development and optimization is STO, doped with low concentrations of Ta or Al. By<br/>leveraging the various modalities available in an aberration corrected STEM, such as<br/>integrated differential phase contrast (iDPC) imaging, annular dark field (ADF) imaging and<br/>core-loss electron energy loss spectroscopy (EELS), we deduce information about the<br/>distribution and defect structure of the point defects introduced by doping on an atomic level.<br/>This requires extremely thin samples (< 20 unit cells), prepared through wedge polishing.<br/>Precise thickness determination of crystalline parts will be performed by position averaged<br/>convergent beam electron diffraction (PACBED) measurements, in order to allow direct<br/>quantitative comparison with MS<br/>simulations based on atomistic<br/>modelling. Our main focus lies on<br/>the presence of O and Sr<br/>vacancies. Preliminary results<br/>obtained from STO:Ta are<br/>illustrated in Figure 2. The highangle<br/>annular dark-field (HAADF)<br/>signal demonstrates a 30%<br/>intensity increase at certain TiO<br/>atom columns, indicating the<br/>presence of Ta atoms within<br/>those positions. Additionally, a<br/>minor decrease in Sr intensities<br/>adjacent to identified dopant<br/>sites is observed, suggesting the<br/>possible existence of Sr<br/>vacancies near Ta dopants.