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MA: Fachverband Magnetismus
MA 51: Caloric Effects in Ferromagnetic Materials
MA 51.13: Talk
Friday, March 22, 2024, 13:00–13:15, H 2013
Influence of hydrostatic pressure on the magnetocaloric effect of La0.7Ce0.3Fe11.6Si1.4 — •Benedikt Beckmann1, Lukas Pfeuffer1, Johanna Lill2, Benedikt Eggert2, David Koch1, Barbara Lavina3,4, Jiyong Zhao4, Thomas Toellner4, Esen E. Alp4, Katharina Ollefs2, Konstantin P. Skokov1, Heiko Wende2, and Oliver Gutfleisch1 — 1Institute of Materials Science, TU Darmstadt, Darmstadt, Germany — 2Faculty of Physics and CENIDE, UDE, Duisburg, Germany — 3Center for Advanced Radiation Sources, UChicago, Chicago, USA — 4Advanced Photon Source, Argonne National Laboratory, Argonne, USA
Magnetocaloric liquefaction of hydrogen, which is a key enabler for the successful transition towards a carbon neutral society based on renewable energies, is a crucial and promising future technology. However, the current dependence on highly-critical, heavy rare-earth based magnetocaloric materials is a major disadvantage for the global usage of the technology. In this work, we aim to mitigate this limitation by using a multi-stimuli approach, utilizing isotropic pressure and magnetic field as external stimuli to tailor and induce the phase transition associated with a large caloric effect. We use non-toxic, low-cost, and low-criticality La0.7Ce0.3Fe11.6Si1.4, achieving phase transitions in the temperature range from 200 K down to liquid hydrogen temperatures with large isothermal entropy changes up to 28 J(kgK)-1.
We acknowledge financial support from DFG through CRC 270 HoMMage (Project-ID 405553726) and thank the Argonne National Laboratory for allocating beamtime.
Keywords: Phase transitions; La(Fe,Si)13; Multicaloric; Gas liquefaction