It would be humble gesture if some one could confirm the formation od oxides in the attached SEM image as it is the image of sample tested for wear at 500 degree celcius
Dear Sanjay, from the image provided it is very difficult to identify iron oxides (or other phases for that matter - I would suggest that for any follow up analysis, the sample surface should be polished).
For in-situ identification of iron oxides you could try Raman spectroscopy. Iron oxides show distinct Raman spectra that easily enables their identification. As the sample has been heated at 500C, any water/OH-bearing iron oxides, such as goethite, will have been transformed to the anhydrous Fe-oxide, hematite.
I have attached a document that describes in some detail the application of the technique for in-situ analysis, which can be done to a spatial resolution of 2-5 microns. The reference is Chapter 6 in the book, Iron Ore, Mineralogy, Processing and Environmental Sustainability, (L. Lu, ed.), Woodhead Publishing Series in Metals and Surface Engineering, #66, 2015.
Another technique (once the sample is polished) would be XRF element mapping, using either an SEM or for larger areas a Bruker Tornado XRF mapper. This, however, would only give you chemical information, with identification of iron oxides being made on differences in relative Fe content and associated minor/trace element composition.
Hope this helps,
Regards,
Martin
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