Giant magnetocaloric effect for (Mn, Fe, V)2(P, Si) alloys with low hysteresis

Lai, J.; Huang, B.; You, X.; Maschek, M.; Zhou, Guofu; van Dijk, N.H.; Brück, E.H.

doi:10.1016/j.jsamd.2023.100660

Giant magnetocaloric effect for (Mn, Fe, V)2(P, Si) alloys with low hysteresis

Title

Giant magnetocaloric effect for (Mn, Fe, V)2(P, Si) alloys with low hysteresis

Author

Lai, J. (TU Delft Electrical Engineering, Mathematics and Computer Science; South China Normal University)
Huang, B. (TU Delft RST/Fundamental Aspects of Materials and Energy)
You, X. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Maschek, M. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Zhou, Guofu (South China Normal University)
van Dijk, N.H. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Brück, E.H. (TU Delft RST/Fundamental Aspects of Materials and Energy)

Faculty

Electrical Engineering, Mathematics and Computer Science

Date

2024

Abstract

The Fe₂P type Mn–Fe–P–Si alloys exhibit a giant magneto-elastic first-order transition, but the large hysteresis limits their performance. Crystal structure evolution and magnetocaloric performance were investigated by varying the Mn and Fe contents at a constant V substitution of 0.02 in Fe₂P-type (Mn_1.17-xFe_0.73-yV_0.02) (P_0.5Si_0.5) (where x + y = 0.02). The V substitution of Fe content shows a larger reduction of hysteresis compared with the same substitution amount of Mn content. During magnetoelastic phase transition, V-substitution reduces the volume change and the volumetric stresses, providing a superior mechanical stability. Compound with the V substitution of Fe (y = 0.02) shows the best magnetocaloric effect with a low thermal hysteresis of 0.6 K. Our developed Mn_1.17-xFe_0.73-yV_0.02P_0.5Si_0.5 alloys are excellent materials for room-temperature magnetic heat-pumping applications by using a permanent magnet.