Can you please provide more complete details?
What system are you studying?What phases do you expect? How many phases (down to what trace levels) do you wish to identify and to what accuracy? What instrumentation (just a DS camera, or maybe a diffractometer) are you using/do you have at your disposal?
What software is avaliable at your XRD lab? Do you have the PDF database on a computer? Do you also have any search/match software? Do you have a Rietveld Analysis (the only way I know to determine particle size) program ?