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SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.22: Poster

Thursday, September 30, 2021, 13:30–16:30, P

Magnetocaloric effect in the Ho1−xDyxAl2 family in high magnetic fields — •Eduard Bykov1,2, Wei Liu3, Konstantin Skokov3, Franziska Scheibel3, Oliver Gutfleisch3, Sergey Taskaev4, Catalina Salazar Mejia1, Joachim Wosnitza1,2, and Tino Gottschall11Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany — 3Funktionale Materialien, Technische Universität, TU Darmstadt, Germany — 4Chelyabinsk State University, Russia

Hydrogen has the largest gravimetric energy density among all chemical fuels. At the same time, the density of gaseous H2 is extremely low. For storage and transportation reasons it can be liquified. But it requires energy-intensive cooling down to 20 K. Magnetocaloric materials have the great potential to revolutionize gas liquefaction in order to make liquid hydrogen more competitive as fuel. We investigated a series of Laves-phase materials regarding their structural, magnetic, and magnetocaloric properties in high magnetic fields. The three compounds HoAl2, Ho0.5Dy0.5Al2, and DyAl2 are suited for building a stack for cooling from liquid-nitrogen temperature (77 K) down to the boiling point of hydrogen at 20 K. This is evident from our direct measurements of the adiabatic temperature change in pulsed magnetic fields, which we compare with calorimetric data measured in static field. With this methodology, we are now able to study the suitability of magnetocaloric materials down to low temperatures up to the highest magnetic fields.

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