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Reactive single-step hot-pressing and magnetocaloric performance of polycrystalline Fe2Al1.15-xB2GexGax (x = 0, 0.05) MAB phases
Conference paper   Open access

Reactive single-step hot-pressing and magnetocaloric performance of polycrystalline Fe2Al1.15-xB2GexGax (x = 0, 0.05) MAB phases

Benedikt Beckmann, Tarek A. El-Melegy, David Koch, Ulf Wiedwald, Michael Farle, Fernando Maccari, Joshua Snyder, Konstantin P. Skokov, Michel W. Barsoum and Oliver Gutfleisch
2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers), pp 1-2
May 2023
DOI: https://doi.org/10.1109/INTERMAGShortPapers58606.2023.10228262
url
https://arxiv.org/abs/2304.06997View
SubmittedOpen Access (License Unspecified),  Open

Abstract

Costs Fe 2 AlB 2 Germanium Hot-pressing MAB phases Magnetic field measurement Magnetization Magnetocaloric effect Performance evaluation Temperature Temperature measurement
Reactive single-step hot-pressing at 1473 K and 35 MPa for 4 h produces dense, bulk, near single-phase, low-cost and low-criticality Fe 2 Al 1.15 B 2 and Fe 2 Al 1.1 B 2 Ge 0.05 Ga 0.05 MAB samples, showing a second-order magnetic phase transition with favorable magnetocaloric properties around room temperature. The magnetic as well as magnetocaloric properties can be tailored upon Ge and Ga doping, leading to an increase of Curie temperature and spontaneous magnetization. The maximum isothermal entropy change of hot-pressed Fe 2 Al 1.15 B 2 in magnetic field changes of 2 and 5 T amounts to 2.5 and 5 J(kgK) -1 at 287.5 K and increases by Ge and Ga addition to 3.1 and 6.2 J(kgK) -1 at 306.5 K, respectively. The directly measured maximum adiabatic temperature change is improved by the composition modification from 0.9 to 1.1 K in magnetic field changes of 1.93 T. Overall, we demonstrate that hot-pressing provides a much faster, more scalable and processing cost reducing alternative compared to conventional synthesis routes to produce heat exchangers for magnetic cooling devices. Therefore, our criticality assessment shows that hot-pressed Fe-based MAB phases provide a promising compromise of material and processing cost, criticality and magnetocaloric performance, demonstrating the potential for low-cost and low-criticality magnetocaloric applications around room temperature.

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