I have to define amount of each crystalline phase in a Nano crystalline composite prepared by Sol-gel method. For the reference sample, in Retvield refinement is it possible to use High-Quality products of Merck company which are not prepared in the same situation as my powder was? Would Any differences in crystallite size or particles make any uncertainty in the results?
No, I would not trust any commercial product for use as a standard (until you have personally verfied it for suitability for your particular needs). For crystallinity determination by Rietveld analysis, you do not use a standard of the same material, you add a standard that is a different material with a known crystallinity fraction.
You are welcome. Perhaps I should add that my company will sell a portion of a NIST SRM for a cost less than that of NIST's full container or we can provide other materials that we have carefully compared to NIST SRMs, but are less expensive (and not certfied). See www.protoxrd.com
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