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MA: Fachverband Magnetismus

MA 18: Caloric Effects in Ferromagnetic Materials (joint session MA/TT)

MA 18.2: Vortrag

Dienstag, 10. März 2026, 10:00–10:15, POT/0151

Hydrogen tunned transition temperature of GdFeSi for magnetocaloric hydrogen liquefaction application — •Allan Döring¹, Wei Liu¹, Marc Straßheim², Tino Gottschall², Konstantin Skokov¹, and Oliver Gutfleisch¹ — ¹Institute of Materials Science, Functional Materials, Technical University of Darmstadt, Darmstadt, Germany — ²Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany

Hydrogen can play an important role in the future carbon-neutral society. Among several alternatives to store this energy carrier, the liquid H2 (LH2) stands out for its higher volume-to-energy ratio. However, the actual method of H2 liquefaction sums up to 34% of the costs of LH2. The magnetocaloric cooling could be one alternative to improve the efficiency of the process. Thus, it is essential to conduct research on materials exhibiting a strong magnetocaloric effect (MCE) within the temperature range of 20 K to 77 K. The peak of the MCE is at transition temperatures, such as the Curie temperature (TC). The magnetocaloric effect peak of GdFeSi is at 125 K. In this study, the TC of GdFeSi was shifted to lower temperatures by hydrogenation process, achieving a shift of over 90 K. By the anisotropic crystal expansion, GdFeSiH exhibited and higher magnetocaloric effect than the pristine alloy, not only by the isothermal entropy change, but also directly measured adiabatic temperature change. We acknowledge the HyLICAL project for the funding of this research through grant 101101461, and Deutsche Forschungsgemeinschaft (DFG) within the CRC/TRR 270 (Project-ID 405553726).

Keywords: Hydrogen; Magnetocaloric; Liquefaction