Moessbauer Study of Iron-Containing Carbon Nanotubes

摘要

~(57)Fe transmission Moessbauer at temperatures between 18 and 298 K and magnetic measurements have been used to characterize Fe-filled carbon nanotubes which were prepared by pyrolisis of Ferrocene + C_(60) at atmospheric pressure under an Ar atmosphere at 1050℃. The Moessbauer data have shown that the Fe phases encapsulated within the carbon nanotubes are α-Fe, Fe_3C and γ-Fe. The magnetic results are compatible with the Moessbauer data. Taken together the results allow us to propose a simple picture of the distribution of iron phases within the carbon nanotubes which would consist of an α-Fe core surrounded by an γ-Fe shell, finally covered by an Fe_3C layer.