Antiferromagnetic Ordering in VFeNbTiMo High-Entropy Alloy at Low Temperatures

P. Sobotaa, b, R. Idczaka, R. Koniecznya, W. Nowaka, b, V.H. Tranb aInstitute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland bInstitute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland

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Structural and physical properties of the VFeNbTiMo high-entropy alloy were studied by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, 57Fe transmission Mössbauer spectroscopy, and magnetic measurements. It was found that the alloy forms two chemically distinct phases. The first, Mo-rich phase, crystallizes in a body-centered cubic structure (space group Im̅3m) with a=3.1626(1) Å. The second, Fe-rich phase, crystallizes in a hexagonal structure (space group P63/mmc) with a=4.9245(2) Å, c=8.0419(5) Å. Magnetic measurements and 57Fe transmission Mössbauer spectroscopy showed that the alloy is in a paramagnetic state at temperatures between 5 and 700 K. Below 5 K, the hexagonal Fe-rich phase undergoes an antiferromagnetic transition.

DOI:10.12693/APhysPolA.146.250 topics: high-entropy alloys, Mössbauer spectroscopy, magnetism