Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I
MA 20.41: Poster
Dienstag, 19. März 2024, 16:30–19:00, Poster A
The valence of Ce in Ce-substituted permanent magnets — •Janosch Tasto1, Benedikt Eggert1, Yuan Hong2, William Rigaut2, Stéphane Grenier2, Thibaut Devillers2, Nathan Yutronkie3, Fabrice Wilhelm3, Andrei Rogalev3, Heiko Wende1, Nora Dempsey2, and Katharina Ollefs1 — 1Univ. of Duisburg-Essen — 2Institute Néel — 3ESRF
The current development in our society towards more green energy conversion and electric mobility comes hand in hand with a rising demand in permanent magnets including critical rare-earth (RE) elements. The availability of these elements is often restricted by either political boundaries or limited abundance. Therefore, replacing heavy RE elements with more accessible ones while maintaining the magnetic properties of the compound is essential.
Here, we study the role of Ce as a candidate to replace heavy RE elements by investigating its 4f/5d valence state in different Ce-substituted permanent magnet systems. X-ray absorption spectroscopy was performed on Ce-Co, Ce-Co-Zn, and Nd-Ce-La-Fe-B systems with varying composition examining respective K and L2,3 edges of their components. We correlate our spectroscopic findings with the composition and the magnetic properties in order to understand the influence of Ce-substitution on the magnetic properties.
We thank the Toyota Motor Corporation, the French National Research Agency (ANR-22-CE91-0008) and the German Research Foundation (CRC/TRR 270 and CRC 1242) for financial support.
Keywords: XAS; permanent magnets; multivalence; Ce; pinning type magnets