2024/10/02 by Sagar Ghorai, Rebecca Clulow, Ghorai, Sagar +26
Materials Science · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Shape Memory Alloy Transformations
paper · pdf · doi:10.48550/arxiv.2410.01747
openalex publication_date 2024/10/02 · openalex created_date 2024/10/29 · openalex updated_date 2026/07/28
The non-stoichiometric Fe2P-type (FeMnP0.5Si0.5)1-x(FeV)x alloys ( x=0, 0.01, 0.02, and 0.03) have been investigated as potential candidates for magnetic refrigeration near room temperature. The magnetic ordering temperature decreases with increasing FeV concentration, x, which can be ascribed to decreased ferromagnetic coupling strength between the magnetic atoms. The strong magnetoelastic coupling in these alloys results in large values of the isothermal entropy change (ΔSM); 15.7 J/kgK, at 2 T magnetic field for the x = 0 alloy. ΔSM decreases with increasing x. Results from Mössbauer spectroscopy reveal that the average hyperfine field (in the ferromagnetic state) and average center shift (in the paramagnetic state) have the same decreasing trend as ΔSM. The thermal hysteresis (ΔThyst) of the magnetic phase transition decreases with increasing x, while the mechanical stability of the alloys improves due to the reduced lattice volume change across the magnetoelastic phase transition. The adiabatic temperature change ΔTad, which highly depends on ΔThyst, is 1.7 K at 1.9 T applied field for the x = 0.02 alloy.