| 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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Schmidt, Harald
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Acoustic Loss in LiNb1−xTaxO3 at Temperatures up to 900 °C
- 2024Acoustic loss in LiNb1-xTaxO3 at temperatures up to 900 °C
- 2023Increase of electrode life in resistance spot welding of aluminum alloys by the combination of surface patterning and thin-film diffusion barrierscitations
- 2023In-situ Neutron Reflectometry to Determine Ge Self-Diffusivities and Activation Energy of Diffusion in Amorphous Ge0.8Si0.2citations
- 2023Lithium Niobate for Fast Cycling in Li-ion Batteries: Review and New Experimental Resultscitations
- 2023Lithium-ion diffusion in near-stoichiometric polycrystalline and monocrystalline LiCoO2citations
- 2022Activation energy of diffusion determined from a single in-situ neutron reflectometry experimentcitations
- 2022The lithiation onset of amorphous silicon thin-film electrodescitations
- 2021Proton exchange at LiNbO3 surfaces - diffusion investigations
- 2014Microstructural Evolution of (Ti,W,Cr)B2 Coatings Deposited on Steel Substrates during Annealing
- 2012Self-diffusion of lithium in amorphous lithium niobate layers
- 2010Crystallization Kinetics of Amorphous Si-C-N Ceramics: Dependence on Nitrogen Partial Pressure
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article
Proton exchange at LiNbO3 surfaces - diffusion investigations
Abstract
Proton exchange (PE) is a widely used technique to modify the surface of LiNbO3 within the region of 1 µm. The resulting Li1-nHnNbO3 layer has different optical properties (e.g. refractive index) in comparison to LiNbO3 bulk crystals. The optical properties of the standard LiNbO3 together with the possibility to modify the refractive index in a welldefined surface layer make this material to a model material for photonic and optoelectronic studies. The proton exchange process is typically done by treatment of the sample in an acid as proton source. Regardless of the technical use, the fundamental aspects of the proton exchange process are unclear up to now (“The known data on PE kinetics do not go beyond the “technological” framework ... “ [1]). The determination of the diffusion coefficients in the modified Li1-nHnNbO3 should help to extract a kinetic model to describe the process. In our investigations, we use benzoic acid with different concentrations of lithium benzoate as proton source. We determined the depth of the proton exchange area and the tracer diffusivity of deuterium in the exchanged region at 230 °C using Secondary Ion Mass Spectrometry (SIMS) and in the second case deuterated benzoic acid in addition. During further experiments we used isotope labeled 6LiNbO3 thin films as a tracer source to monitor the diffusion of lithium also by SIMS. With the information about tracer diffusivities of deuterium and lithium, it will be possible to develop a model to describe the kinetics of the proton exchange process in detail.