SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 42: Caloric Effects in Ferromagnetic Materials
MA 42.1: Vortrag
Donnerstag, 30. März 2023, 15:00–15:15, HSZ 04
Exploring rare earth Laves phases for magnetocaloric hydrogen liquefaction — •Bruno Weise1, Marvin Hofmann1,2, Lukas Beyer1,3, and Tino Gottschall4 — 1Leibniz IFW, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3TU Bergakademie Freiberg, Freiberg, Germany — 4Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
The replacement of fossil fuels with renewable energies is an integral part of fighting the global climate crisis. Green hydrogen, produced with renewable energies, is one of the most promising energy sources. The unsurpassed high storage density of liquid hydrogen offers great advantages, especially on long transport routes. By magnetocaloric cooling the efficiency of the energy-intensive liquefaction of hydrogen will be increased. RE-X2 Laves phases, are ideal for low temperature hydrogen liquefaction in the temperature range between 77 and 20 K.
By substitution of individual elements in the RE-X2 Laves phases the transition temperature can be manipulated, while maintaining the magnetocaloric performance. A substitution series of DyNi2−xAlx was prepared by arc melting and studied by structural, magnetic and thermodynamic characterization methods. The investigated alloy series DyNi2−xAlx shows a nonlinear substitution dependency of the Curie Temperature and adiabatic temperature change. In pulsed field measurements a temperature of up to 17 K for 10 T magnetic field pulse was measured. In the present contribution we will evaluate the suitability of the DyNi2−xAlx rare earth Laves phases for magnetocaloric hydrogen liquefaction.