Mössbauer spectroscopy and X-ray diffraction studies of ball-milling-induced tr...

• Autor(es): Costa, B. F. O. ; Caër, G. Le ; Malaman, B. ; Batista, A. C.
• Data: 2007
• Identificador Persistente: http://hdl.handle.net/10316/4363
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Mössbauer spectroscopy; X-ray diffraction; Fe-V alloys; Ball milling; Spinel structure
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

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. http://www.sciencedirect.com/science/article/B6TJM-4NRK4D4-J/1/9ec4d29992cf5ef15201741a15eb3715