Berlin 2024 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: KFM Poster Session
KFM 9.40: Poster
Monday, March 18, 2024, 18:00–20:00, Poster E
Probing energetics of defects with experimental thermodynamics to unravel hydrogen adsorption sites — •Anna Shelyug1, Chukwudalu Okafor2, Oliver Preuß2, Judith Jung1, Christoph Gebert1, Christoph Kirchlechner1, Hans-Jürgen Seifert1, and Xufei Fang1,2 — 1Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt, Germany
Defects can significantly impact materials ability to adsorb hydrogen. Understanding of defects energetics is essential for designing materials with optimal hydrogen storage and utilization properties while mitigating issues related to embrittlement and other undesired effects.
To quantitatively probe the amount of energy stored in materials in the form of various defects utilizing experimental thermodynamics, this study aims to provide a proof of concept using single-crystal oxides with introduced dislocations, which are further subjected to experimental thermodynamics testing using two major techniques: high-temperature oxide-melt solution calorimetry and differential scanning calorimetry. The first one allows for the evaluation of the overall energy that is associated with any material property and the other one aims to distinguish between various processes that might take place in a structure when it is heated.
Obtained thermodynamic data would provide means for the further investigations on stability of defect structures in the further study of hydrogen-defects interaction.
Keywords: Defects; Dislocations; Annealing; Thermodynamics; Calorimetry