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Mössbauer spectroscopy and X-ray Diffraction Studies of Ball-Milling Induced Transformations of Near Equiatomic FeV Sigma Phase: Influence of Oxygen

Authors: B.F.O. Costa, G. Le Caër, B. Malaman, A.C. Batista

Ref.: Nuclear Instruments and Methods in Physics Research A 580, 404-407 (2007)

Abstract: 57Fe Mössbauer spectroscopy and X-ray diffraction were used to study the structural changes induced by ball milling a coarse-grained Fe48.1V51.9 at% sigma phase in a vibratory mill in argon with a frequent gas renewal. The sigma phase transforms into a bcc alpha phase till 140 h of milling. Mössbauer spectroscopy also shows the presence of an amorphous phase. Further, X-ray diffraction and Mössbauer spectroscopy reveals the presence of a corundum type oxide (V1–xFex)2O3 and of a spinel FeV2O4 in samples milled for 140 h and longer. Mössbauer spectroscopy clearly shows that the spinel phase starts to form after 140 h of milling. Oxidation is progressive and occurs first via an unmixing process which deprives the Fesingle bondV bcc matrix of vanadium atoms.

DOI: 10.1016/j.nima.2007.05.065