Magnetocaloric effect in the Laves-phase Ho1xDyxAl2 family in high magnetic fields

E. Bykov, W. Liu, K. Skokov, F. Scheibel, O. Gutfleisch, S. Taskaev, V. Khovaylo, D. Plakhotskiy, C. Salazar Mejia, J. Wosnitza, and T. Gottschall
Phys. Rev. Materials 5, 095405 – Published 27 September 2021

Abstract

Hydrogen has the largest gravimetric energy density among all chemical fuels. At the same time, the density of gaseous H2 is extremely low, which makes its compression to high pressures, liquefaction, or solid-state storage necessary for transport purposes. Liquid hydrogen (LH2) can be transported in a dewar under atmospheric pressure, but this requires energy-intensive cooling down to 20K. Magnetocaloric materials have great potential to revolutionize gas liquefaction to make LH2 more competitive as fuel. In this paper, we investigate 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 (77K) down to the boiling point of hydrogen at 20K. This is evident from our direct measurements of the adiabatic temperature change in pulsed magnetic fields, which we compare with calorimetric data measured in a 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 of 50 T.

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  • Received 14 May 2021
  • Accepted 10 September 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.095405

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

E. Bykov1,2,*, W. Liu3, K. Skokov3, F. Scheibel3, O. Gutfleisch3, S. Taskaev4,5, V. Khovaylo5,6, D. Plakhotskiy4, C. Salazar Mejia1, J. Wosnitza1,2, and T. Gottschall1

  • 1Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 2Institut für Festkörper und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany
  • 3Institut für Materialwissenschaft, Technische Universität Darmstadt, Alarich-Weiss-Str. 16, 64287 Darmstadt, Germany
  • 4Chelyabinsk State University, Br. Kashirinykh Str. 129, 454001 Chelyabinsk, Russia
  • 5South Ural State University (National Research University), Lenin Prospekt 76, 454080 Chelyabinsk, Russia
  • 6National University of Science and Technology “MISiS”, Leninskiy Prospect 4, 119991 Moscow, Russia

  • *e.bykov@hzdr.de

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Vol. 5, Iss. 9 — September 2021

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