I don't know the answer to your question, but I saw you are using a Rigaku.  Our 
company is considering purchasing an XRD with a hot stage, and the Rigaku is one 
unit we are looking at.  How do you like it and the company support?  Ever use a 
hot stage. 
Good luck with Reitveld and your studies, in any case.  What are Al oxynitrides 
and what are the interesting questions about them?