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Title: Mössbauer spectroscopy and X-ray diffraction studies of ball-milling-induced transformations of a near-equiatomic FeV sigma phase: Influence of oxygen
Authors: Costa, B. F. O. 
Caër, G. Le 
Malaman, B. 
Batista, A. C. 
Keywords: Mössbauer spectroscopy; X-ray diffraction; Fe-V alloys; Ball milling; Spinel structure
Issue Date: 2007
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:1 (2007) 404-407
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 FeV bcc matrix of vanadium atoms.
DOI: 10.1016/j.nima.2007.05.065
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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