Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Magnetic particles and clusters

MA 46.4: Talk

Thursday, April 4, 2019, 12:15–12:30, H52

Mössbauer characterization of electrocatalytic ferrites — •Soma Salamon¹, Joachim Landers¹, Georg Bendt², Kalapu Chakrapani², Friedrich Waag², Stephan Schulz², Malte Behrens², Rossitza Pentcheva¹, Stephan Barcikowski², and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen — ²Faculty of Chemistry and CENIDE, University of Duisburg-Essen

Mössbauer spectroscopy has been applied to a variety of different ferrite material systems that show great promise for the application in the oxygen evolution reaction. Using measurements in transmission geometry at low temperatures and high magnetic fields, we were able to obtain information on the degree of inversion in spinel systems, which was correlated with the catalytic activities of the respective materials. A further adjustment of the catalytic activity was performed via pulsed laser fragmentation as well as cation substitution of ferrite nanoparticles, with the resulting changes in magnetic and material properties also being observable in our Mössbauer spectroscopy results. These were additionally crosschecked via magnetometry measurements. Financial support by the DFG through CRC/TRR 247 (project B2) is gratefully acknowledged.