Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.23: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Significant Enhancement of Magnetocaloric Performance of LaFe12B6 via Microstructure Optimization — •Protyasha Prachurja, Wei Liu, Alex Aubert, Benedikt Beckmann, Konstantin Skokov, and Oliver Gutfleisch — Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

Light rare-earth magnetocaloric (MC) materials are appealing because of their abundance and reduced criticality risks [1]. Within this group of materials, LaFe12B6 - a first-order MC compound - undergoes a phase transition around 36 K, making it a potential candidate for hydrogen liquefaction applications [2]. However, its pronounced MC effect emerges only under relatively high magnetic fields (>5 T), which restricts its performance at lower fields [3]. This limitation is linked to its antiferromagnetic ground state and the presence of secondary phases in the microstructure. We carried out a systematic optimization of the synthesis conditions to improve phase purity and magnetocaloric properties. We found that annealing at 1383 K for 24 hours with a 3% La excess reduced the secondary phase content from 13.2 to 7.7 wt.% and sharpened the first-order transition. Consequently, the peak magnetic entropy change increased significantly from -1 to -10 J/kgK under a 5 T field. References: [1] Wei Liu et al. J. Phys. Energy, 2023, 5.3, 034001; [2] L.V.B. Diop; O. Isnard; J. Rodríguez-Carvajal Phys. Rev. B, 2016, 93.1, 80; [3] L.V.B. Diop; O. Isnard J. App. Phys., 2016, 119.21, 213904. Acknowledgement: We acknowledge financial support by the DFG within the CRC/TRR 270 (Project-ID 405553726).

Keywords: Magnetocaloric; first-order phase transition material; La-Fe-B; microstructure; hydrogen liquefaction