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MA: Fachverband Magnetismus
MA 18: Magnetic Particles and Clusters
MA 18.4: Vortrag
Montag, 16. März 2020, 17:30–17:45, HSZ 403
Element-specific characterization of catalytic ferrite nanoparticles via Mössbauer spectroscopy — •Soma Salamon1, Joachim Landers1, Georg Bendt2, Swen Zerebecki3, Sascha Saddeler2, Anna Rabe2, Malte Behrens2, Stephan Schulz2, Stephan Barcikowski3, and Heiko Wende1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen — 2Institute of Inorganic Chemistry and CENIDE, University of Duisburg-Essen — 3Institute of Technical Chemistry I and CENIDE, University of Duisburg-Essen
Mössbauer spectroscopy is utilized as an element-specific, non-destructive measurement method to probe hyperfine interactions in ferrite materials, which are promising candidates for electrocatalysis applications. Evaluation of low temperature spectra recorded at high magnetic fields allows us to determine the degree of inversion in spinel systems, providing important clues on the distribution of Fe-ions on different crystallographic sites, while the isomer shift makes it possible to draw conclusions on the valency states. This enables us to correlate changes in ion distribution in the lattice with improvements in catalytic activity, which can be achieved by a number of methods. Several examples on nanoparticulate systems will be shown: The modification of particle composition during and after synthesis, as well as a laser-treatment of nanoparticles. In all cases, our measurement method offers valuable insights into which parameters are modified by the respective sample treatment, facilitating a more effective search for the best method to increase catalytic efficiency. Funding by the DFG via the CRC/TRR 247 (Project B2) is gratefully acknowledged.