Fe100-xRhx alloys with x near 50: evolution of the crystal and magnetic structures on the first-order magnetostructural transition
Binary FeRh alloys with a chemical composition close to equiatomic exhibit the highest adiabatic temperature change ever reported. The effect is associated with the coupled first-order magnetoelastic phase transition, which is accompanied by a change in the magnetic structure from antiferromagnetic (AFM) to ferromagnetic (FM). We have analyzed two induction melted and thermally annealed bulk Fe100-xRhx alloys with x=50 and 51, which show well-different phase transition characteristics: the first-order magnetostructural transition for 49:51 samples is quite abrupt and is accompanied by a magnetization change żM of 122 Am2kg-1, while it spreads over a wide temperature interval and żM fluctuates around 116 Am2kg-1 for the 50:50 one. Consequently, both samples show magnetocaloric properties that are very different. We propose a neutron thermo-diffraction experiment in D1B to investigate how the crystallographic and magnetic structures as well as their degree of coupling evolve with the temperature through both the AFM-FM and FM-AFM transitions. The latter will provide a better understanding of the correlation between the observed magnetostructural and magnetocaloric properties.
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P. Alvarez-Alonso; ARREGUIN HERNANDEZ Maria de Lurdes; BLANCO RODRIGUEZ Jesus Angel; CUELLO Gabriel Julio; Pedro Gorria / P. Gorria; LOPEZ GARCIA Javier; PUENTE ORENCH Ines and SANCHEZ-LLAMAZARES Jose L.. (2023). Fe100-xRhx alloys with x near 50: evolution of the crystal and magnetic structures on the first-order magnetostructural transition. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2945
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