Just few words of warning : think of preferred orienatation in your
samples... Moreover, from the vast majority of montmorilonites one gets
only few so
called "00L" diffractions what means that the results of quantitative
phase analysis can be better obtained by a random numbers generator :-)
Enjoy !
Lubo
comparison with "calculated" patterns
gives the numbers whose accuracy is not worth the time you spend with
On Sat, 15 Mar 2008, Alan Hewat wrote:
the cif-file below was created from the AMCSD...
The I/Ic value calculated by Match! is 20.5
The only ICSD entry has an RIR of over 23, so does
vermiculite. Why is that so high?
I guess these differences in I/Ic are not very significant, since the
exact same montmorillonite entry is in ICSD, from which you can export the
CIF directly. (In fact I doubt that there are any AMCSD entries that are
not also in ICSD).
Clays, micas etc are highly layered structures, often with variable
amounts of intercalates, and usually not well ordered. They are therefore
difficult to model, so the profile fit will be relatively poor.
______________________________________________
Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE
<[EMAIL PROTECTED]> +33.476.98.41.68
http://www.NeutronOptics.com/hewat
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