I am looking for cif files for austenite and I
didnt find it in WEB free database or in ICSD database.
Frank is quite correct here. Austenite is gamma-iron, which you can find
immediately with Google or Wikipedia:
http://en.wikipedia.org/wiki/Austenite
Small amounts of carbon or hydrogen
The next step would be quantify these phases by Rietveld method using
TOPAS 3.0.
BTW, it shouldn't need a sophisticated Rietveld refinement to distinguish
between the relative quantities of simple FCC and BCC compounds - some
peaks may overlap almost completely, but others not at all.
I worry
