Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: KFM Poster Session

KFM 9.40: Poster

Montag, 18. März 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 Fang^1,2 — 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