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MA: Fachverband Magnetismus
MA 51: Caloric Effects in Ferromagnetic Materials
MA 51.9: Vortrag
Freitag, 22. März 2024, 12:00–12:15, H 2013
Magnetocaloric effect in (La, Ce)(Fe, Si, Mn)13 with tunable, low transition temperature — •M. Straßheim1,2, C. Salazar-Mejia1, L. Beyer3,4, J. Wosnitza1,2, and T. Gottschall1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2TU Dresden, Germany — 3Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany — 4TU Bergakademie Freiberg, Germany
The upcoming technology of magnetocaloric cooling has several advantages depending on the working temperatures. At room temperature, one can avoid environmentally harmful refrigerants and at cryogenic temperatures - for instance in hydrogen liquefaction - the process itself has a much higher Carnot efficiency than the conventional one. In both cases, a challenge is the availability of magnetocaloric materials: They usually involve large amounts of of costly rare earths to show a significant magnetocaloric effect. The ternary La(Fe,Si)13 solves this issue, but has a transition temperature at 200 K. Recently, we showed that this transition temperature can be tuned down by introducing both Ce and Mn to the system. In this work, we show characterization results of the powder produced in sizes of 25-75 µm as characterized with electron microscopy and x-ray diffraction. In the end, we discuss the possible applicability in 3D printing techniques such as selective laser melting.
Keywords: Magnetocaloric; LaFeSi; Cryogenic