I'm afraid that you got the wrong end of the stick -I wasn't talking about the application of peak broadening to size distribution, I was commenting that determining crystallite shape is perfectly possible (some comments were flying that said otherwise), and I've done it myself. For that purpose a sample approaching monodisperse is helpful. It would be a bit pointless trying to determine the size distribution of a monodisperse sample !! :-)
I did send an email that I think only went to Armel by mistake making this clearer. I was having a slow morning! :-)
Pam
-----Original Message-----
From: Nicolae Popa
To: [EMAIL PROTECTED]
Sent: 11/21/2004 5:04 AM
Subject: Re: rietveld refinement
Doesn't help with a size distribution, as it only works well for a
relatively monodisperse material - but it does work under some
circumstances.
Pam
I disagree, it works also for large dispersion. One example you can find
in JAC (2002) 35, 338-346, "Sample 2". It is true that the specific peak
profile (that can be "superlorentzian") can not be found in no available
Rietveld code. It is also true that no development has been done for
anisotropy. Not yet!
Best wishes,
Nicolae Popa
